Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli
- Autores
- Flores Trivigno, Matias Gaston; Jaque Arancibia, Marcelo Daniel; Ibañez Bustos, Romina Valeria; Buccino, Andrea Paola; Yana Galarza, Jhon; Nuñez, Natalia Edith; Miquelarena Hollger, Paula Andrea; Alacoria, José Alberto; Saffe, Carlos; Mauas, Pablo Jacobo David
- Año de publicación
- 2020
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Context. It is well known that from 1645 to 1715 solar activity was notably low and the number of sunspots was extremely reduced. This epoch is known as the Maunder minimum (MM). The study of stars in prolonged activity minima such as the MM could help to shed light on this enigmatic epoch. However, to date, it is not easy to identify MM candidates among other stars. An original idea, which has hardly been explored, is to compare the activity levels of both components of binary systems. Aims: Our goal is to explore if the star ζ2 Ret, which belongs to a binary system, is in (or going to) a state similar to the MM. We have collected more than 430 spectra acquired between 2000 and 2019 with the HARPS, REOSC, UVES, and FEROS spectrographs. Methods: We performed a detailed long-term activity study of both components using the Mount Wilson index, which is obtained from the Ca II H&K lines. To search for signs of an activity cycle, we analysed the resulting time series with the Generalised Lomb-Scargle and CLEAN periodograms. Results: Our spectroscopic analysis shows a high activity level for ζ1 Ret and a significant decrease in the magnetic activity cycle amplitude of ζ2 Ret. Thus, the activity difference between both components has slightly increased (Δlog RHK' ~ 0.24 dex), when compared to the previously reported value. The long series analysed here allowed us to re-calculate and constrain the period of ζ2 Ret to ∼7.9 yr. We also detected a long-term activity cycle of ∼4.2 yr in ζ1 Ret, which has not been reported in the literature yet. Conclusions: By analogy with the scenario that proposes a weak solar cycle during the MM, we suggest that activity signatures by ζ2 Ret, that is to say a very low activity level when compared to its stellar companion, a notably decreasing amplitude (∼47%), and a cyclic behaviour, are possible evidence that this star could be in an MM state. To our knowledge, it is the first MM candidate star to have been detected through a highly discrepant activity behaviour in a binary system. Finally, we suggest that continuous observations of ζ2 could help to better understand unusual periods such as the MM.
Fil: Flores Trivigno, Matias Gaston. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
Fil: Jaque Arancibia, Marcelo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
Fil: Ibañez Bustos, Romina Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); Argentina
Fil: Buccino, Andrea Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); Argentina
Fil: Yana Galarza, Jhon. Universidade de São Paulo, Departamento de Astronomia do IAG/USP; Brasil
Fil: Nuñez, Natalia Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
Fil: Miquelarena Hollger, Paula Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
Fil: Alacoria, José Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
Fil: Saffe, Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); Argentina - Materia
-
STARS: ACTIVITY
STARS: CHROMOSPHERES
STARS: BINARIES: GENERAL - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/142882
Ver los metadatos del registro completo
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Detecting prolonged activity minima in binary stars. The case of zeta2 ReticuliFlores Trivigno, Matias GastonJaque Arancibia, Marcelo DanielIbañez Bustos, Romina ValeriaBuccino, Andrea PaolaYana Galarza, JhonNuñez, Natalia EdithMiquelarena Hollger, Paula AndreaAlacoria, José AlbertoSaffe, CarlosMauas, Pablo Jacobo DavidSTARS: ACTIVITYSTARS: CHROMOSPHERESSTARS: BINARIES: GENERALhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. It is well known that from 1645 to 1715 solar activity was notably low and the number of sunspots was extremely reduced. This epoch is known as the Maunder minimum (MM). The study of stars in prolonged activity minima such as the MM could help to shed light on this enigmatic epoch. However, to date, it is not easy to identify MM candidates among other stars. An original idea, which has hardly been explored, is to compare the activity levels of both components of binary systems. Aims: Our goal is to explore if the star ζ2 Ret, which belongs to a binary system, is in (or going to) a state similar to the MM. We have collected more than 430 spectra acquired between 2000 and 2019 with the HARPS, REOSC, UVES, and FEROS spectrographs. Methods: We performed a detailed long-term activity study of both components using the Mount Wilson index, which is obtained from the Ca II H&K lines. To search for signs of an activity cycle, we analysed the resulting time series with the Generalised Lomb-Scargle and CLEAN periodograms. Results: Our spectroscopic analysis shows a high activity level for ζ1 Ret and a significant decrease in the magnetic activity cycle amplitude of ζ2 Ret. Thus, the activity difference between both components has slightly increased (Δlog RHK' ~ 0.24 dex), when compared to the previously reported value. The long series analysed here allowed us to re-calculate and constrain the period of ζ2 Ret to ∼7.9 yr. We also detected a long-term activity cycle of ∼4.2 yr in ζ1 Ret, which has not been reported in the literature yet. Conclusions: By analogy with the scenario that proposes a weak solar cycle during the MM, we suggest that activity signatures by ζ2 Ret, that is to say a very low activity level when compared to its stellar companion, a notably decreasing amplitude (∼47%), and a cyclic behaviour, are possible evidence that this star could be in an MM state. To our knowledge, it is the first MM candidate star to have been detected through a highly discrepant activity behaviour in a binary system. Finally, we suggest that continuous observations of ζ2 could help to better understand unusual periods such as the MM.Fil: Flores Trivigno, Matias Gaston. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: Jaque Arancibia, Marcelo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: Ibañez Bustos, Romina Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); ArgentinaFil: Buccino, Andrea Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); ArgentinaFil: Yana Galarza, Jhon. Universidade de São Paulo, Departamento de Astronomia do IAG/USP; BrasilFil: Nuñez, Natalia Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: Miquelarena Hollger, Paula Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: Alacoria, José Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: Saffe, Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); ArgentinaEDP Sciences2020-12-14info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/142882Flores Trivigno, Matias Gaston; Jaque Arancibia, Marcelo Daniel; Ibañez Bustos, Romina Valeria; Buccino, Andrea Paola; Yana Galarza, Jhon; et al.; Detecting prolonged activity minima in binary stars. 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| dc.title.none.fl_str_mv |
Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli |
| title |
Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli |
| spellingShingle |
Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli Flores Trivigno, Matias Gaston STARS: ACTIVITY STARS: CHROMOSPHERES STARS: BINARIES: GENERAL |
| title_short |
Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli |
| title_full |
Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli |
| title_fullStr |
Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli |
| title_full_unstemmed |
Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli |
| title_sort |
Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli |
| dc.creator.none.fl_str_mv |
Flores Trivigno, Matias Gaston Jaque Arancibia, Marcelo Daniel Ibañez Bustos, Romina Valeria Buccino, Andrea Paola Yana Galarza, Jhon Nuñez, Natalia Edith Miquelarena Hollger, Paula Andrea Alacoria, José Alberto Saffe, Carlos Mauas, Pablo Jacobo David |
| author |
Flores Trivigno, Matias Gaston |
| author_facet |
Flores Trivigno, Matias Gaston Jaque Arancibia, Marcelo Daniel Ibañez Bustos, Romina Valeria Buccino, Andrea Paola Yana Galarza, Jhon Nuñez, Natalia Edith Miquelarena Hollger, Paula Andrea Alacoria, José Alberto Saffe, Carlos Mauas, Pablo Jacobo David |
| author_role |
author |
| author2 |
Jaque Arancibia, Marcelo Daniel Ibañez Bustos, Romina Valeria Buccino, Andrea Paola Yana Galarza, Jhon Nuñez, Natalia Edith Miquelarena Hollger, Paula Andrea Alacoria, José Alberto Saffe, Carlos Mauas, Pablo Jacobo David |
| author2_role |
author author author author author author author author author |
| dc.subject.none.fl_str_mv |
STARS: ACTIVITY STARS: CHROMOSPHERES STARS: BINARIES: GENERAL |
| topic |
STARS: ACTIVITY STARS: CHROMOSPHERES STARS: BINARIES: GENERAL |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
Context. It is well known that from 1645 to 1715 solar activity was notably low and the number of sunspots was extremely reduced. This epoch is known as the Maunder minimum (MM). The study of stars in prolonged activity minima such as the MM could help to shed light on this enigmatic epoch. However, to date, it is not easy to identify MM candidates among other stars. An original idea, which has hardly been explored, is to compare the activity levels of both components of binary systems. Aims: Our goal is to explore if the star ζ2 Ret, which belongs to a binary system, is in (or going to) a state similar to the MM. We have collected more than 430 spectra acquired between 2000 and 2019 with the HARPS, REOSC, UVES, and FEROS spectrographs. Methods: We performed a detailed long-term activity study of both components using the Mount Wilson index, which is obtained from the Ca II H&K lines. To search for signs of an activity cycle, we analysed the resulting time series with the Generalised Lomb-Scargle and CLEAN periodograms. Results: Our spectroscopic analysis shows a high activity level for ζ1 Ret and a significant decrease in the magnetic activity cycle amplitude of ζ2 Ret. Thus, the activity difference between both components has slightly increased (Δlog RHK' ~ 0.24 dex), when compared to the previously reported value. The long series analysed here allowed us to re-calculate and constrain the period of ζ2 Ret to ∼7.9 yr. We also detected a long-term activity cycle of ∼4.2 yr in ζ1 Ret, which has not been reported in the literature yet. Conclusions: By analogy with the scenario that proposes a weak solar cycle during the MM, we suggest that activity signatures by ζ2 Ret, that is to say a very low activity level when compared to its stellar companion, a notably decreasing amplitude (∼47%), and a cyclic behaviour, are possible evidence that this star could be in an MM state. To our knowledge, it is the first MM candidate star to have been detected through a highly discrepant activity behaviour in a binary system. Finally, we suggest that continuous observations of ζ2 could help to better understand unusual periods such as the MM. Fil: Flores Trivigno, Matias Gaston. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina Fil: Jaque Arancibia, Marcelo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina Fil: Ibañez Bustos, Romina Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); Argentina Fil: Buccino, Andrea Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); Argentina Fil: Yana Galarza, Jhon. Universidade de São Paulo, Departamento de Astronomia do IAG/USP; Brasil Fil: Nuñez, Natalia Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina Fil: Miquelarena Hollger, Paula Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina Fil: Alacoria, José Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina Fil: Saffe, Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); Argentina |
| description |
Context. It is well known that from 1645 to 1715 solar activity was notably low and the number of sunspots was extremely reduced. This epoch is known as the Maunder minimum (MM). The study of stars in prolonged activity minima such as the MM could help to shed light on this enigmatic epoch. However, to date, it is not easy to identify MM candidates among other stars. An original idea, which has hardly been explored, is to compare the activity levels of both components of binary systems. Aims: Our goal is to explore if the star ζ2 Ret, which belongs to a binary system, is in (or going to) a state similar to the MM. We have collected more than 430 spectra acquired between 2000 and 2019 with the HARPS, REOSC, UVES, and FEROS spectrographs. Methods: We performed a detailed long-term activity study of both components using the Mount Wilson index, which is obtained from the Ca II H&K lines. To search for signs of an activity cycle, we analysed the resulting time series with the Generalised Lomb-Scargle and CLEAN periodograms. Results: Our spectroscopic analysis shows a high activity level for ζ1 Ret and a significant decrease in the magnetic activity cycle amplitude of ζ2 Ret. Thus, the activity difference between both components has slightly increased (Δlog RHK' ~ 0.24 dex), when compared to the previously reported value. The long series analysed here allowed us to re-calculate and constrain the period of ζ2 Ret to ∼7.9 yr. We also detected a long-term activity cycle of ∼4.2 yr in ζ1 Ret, which has not been reported in the literature yet. Conclusions: By analogy with the scenario that proposes a weak solar cycle during the MM, we suggest that activity signatures by ζ2 Ret, that is to say a very low activity level when compared to its stellar companion, a notably decreasing amplitude (∼47%), and a cyclic behaviour, are possible evidence that this star could be in an MM state. To our knowledge, it is the first MM candidate star to have been detected through a highly discrepant activity behaviour in a binary system. Finally, we suggest that continuous observations of ζ2 could help to better understand unusual periods such as the MM. |
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2020 |
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2020-12-14 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://hdl.handle.net/11336/142882 Flores Trivigno, Matias Gaston; Jaque Arancibia, Marcelo Daniel; Ibañez Bustos, Romina Valeria; Buccino, Andrea Paola; Yana Galarza, Jhon; et al.; Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli; EDP Sciences; Astronomy and Astrophysics; 645; L6; 14-12-2020; 1-5 0004-6361 CONICET Digital CONICET |
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http://hdl.handle.net/11336/142882 |
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Flores Trivigno, Matias Gaston; Jaque Arancibia, Marcelo Daniel; Ibañez Bustos, Romina Valeria; Buccino, Andrea Paola; Yana Galarza, Jhon; et al.; Detecting prolonged activity minima in binary stars. The case of zeta2 Reticuli; EDP Sciences; Astronomy and Astrophysics; 645; L6; 14-12-2020; 1-5 0004-6361 CONICET Digital CONICET |
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