The enigmatic binary system HD 5980
- Autores
- Hillier, Desmond John; Koenigsberger, Gloria; Nazé, Yaël; Morrell, Nidia Irene; Barbá, Rodolfo; Gamen, Roberto Claudio
- Año de publicación
- 2019
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The Small Magellanic Cloud multiple system HD 5980 contains a luminous blue variable (LBV) that underwent a major eruption in 1994, and whose current spectrum is that of a hydrogen-rich Wolf-Rayet (WR) star. Since the eruption, the wind mass-loss rate has been declining while wind speeds have been steadily increasing. Observations obtained in 2014 when Star A (the LBV) eclipses Star B indicate that the fitted mass-loss rate and luminosity have reached the lowest values ever determined for such spectra: dot{M} = 4.5 × 10-5M_☉ yr^{-1}, L = 1.7 × 106 L☉. In addition, the radius of the LBV´s continuum-emitting region is similar to that derived from the eclipse light curves of the late 1970s. Hence, it appears to have attained a similar `low´ state to that of the late 1970s. While a good fit to the emission spectrum is obtained using a CMFGEN model, there are discrepancies in the UV. In particular, the extent of the observed absorption profiles is ̃1000 km s-1 greater than predicted by the emission-line intensities. Further, HST UV observations obtained in 2016, when Star A is eclipsed by Star B, show unusual P Cygni profiles that are not easily explained. Surprisingly the 2016 emission-line spectrum is similar to that at the opposite eclipse obtained in 2014. The complex UV profiles are likely to arise as a consequence of the dynamics of the wind-wind collision and radiative braking, both of which will cause significant departures from spherical symmetry, and have a strong orbital phase dependence. However, other scenarios, such as intrinsically aspherical winds, cannot be ruled out.
Fil: Hillier, Desmond John. University of Pittsburgh; Estados Unidos
Fil: Koenigsberger, Gloria. Universidad Nacional Autónoma de México; México
Fil: Nazé, Yaël. Université de Liège; Bélgica
Fil: Morrell, Nidia Irene. Carnegie Institution. Observatorio Las Campanas; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Barbá, Rodolfo. Universidad de La Serena; Chile
Fil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina - Materia
-
binaries: eclipsing
stars: individual(HD 5980)
stars: Wolf-Rayet
stars: winds
outflows
stars: mass-loss - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/125384
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CONICET Digital (CONICET) |
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The enigmatic binary system HD 5980Hillier, Desmond JohnKoenigsberger, GloriaNazé, YaëlMorrell, Nidia IreneBarbá, RodolfoGamen, Roberto Claudiobinaries: eclipsingstars: individual(HD 5980)stars: Wolf-Rayetstars: windsoutflowsstars: mass-losshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The Small Magellanic Cloud multiple system HD 5980 contains a luminous blue variable (LBV) that underwent a major eruption in 1994, and whose current spectrum is that of a hydrogen-rich Wolf-Rayet (WR) star. Since the eruption, the wind mass-loss rate has been declining while wind speeds have been steadily increasing. Observations obtained in 2014 when Star A (the LBV) eclipses Star B indicate that the fitted mass-loss rate and luminosity have reached the lowest values ever determined for such spectra: dot{M} = 4.5 × 10-5M_☉ yr^{-1}, L = 1.7 × 106 L☉. In addition, the radius of the LBV´s continuum-emitting region is similar to that derived from the eclipse light curves of the late 1970s. Hence, it appears to have attained a similar `low´ state to that of the late 1970s. While a good fit to the emission spectrum is obtained using a CMFGEN model, there are discrepancies in the UV. In particular, the extent of the observed absorption profiles is ̃1000 km s-1 greater than predicted by the emission-line intensities. Further, HST UV observations obtained in 2016, when Star A is eclipsed by Star B, show unusual P Cygni profiles that are not easily explained. Surprisingly the 2016 emission-line spectrum is similar to that at the opposite eclipse obtained in 2014. The complex UV profiles are likely to arise as a consequence of the dynamics of the wind-wind collision and radiative braking, both of which will cause significant departures from spherical symmetry, and have a strong orbital phase dependence. However, other scenarios, such as intrinsically aspherical winds, cannot be ruled out.Fil: Hillier, Desmond John. University of Pittsburgh; Estados UnidosFil: Koenigsberger, Gloria. Universidad Nacional Autónoma de México; MéxicoFil: Nazé, Yaël. Université de Liège; BélgicaFil: Morrell, Nidia Irene. Carnegie Institution. Observatorio Las Campanas; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Barbá, Rodolfo. Universidad de La Serena; ChileFil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaWiley Blackwell Publishing, Inc2019-03-19info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/125384Hillier, Desmond John; Koenigsberger, Gloria; Nazé, Yaël; Morrell, Nidia Irene; Barbá, Rodolfo; et al.; The enigmatic binary system HD 5980; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 486; 1; 19-3-2019; 725-7420035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/486/1/725/5393415info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stz808info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:43:44Zoai:ri.conicet.gov.ar:11336/125384instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:43:45.234CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
The enigmatic binary system HD 5980 |
title |
The enigmatic binary system HD 5980 |
spellingShingle |
The enigmatic binary system HD 5980 Hillier, Desmond John binaries: eclipsing stars: individual(HD 5980) stars: Wolf-Rayet stars: winds outflows stars: mass-loss |
title_short |
The enigmatic binary system HD 5980 |
title_full |
The enigmatic binary system HD 5980 |
title_fullStr |
The enigmatic binary system HD 5980 |
title_full_unstemmed |
The enigmatic binary system HD 5980 |
title_sort |
The enigmatic binary system HD 5980 |
dc.creator.none.fl_str_mv |
Hillier, Desmond John Koenigsberger, Gloria Nazé, Yaël Morrell, Nidia Irene Barbá, Rodolfo Gamen, Roberto Claudio |
author |
Hillier, Desmond John |
author_facet |
Hillier, Desmond John Koenigsberger, Gloria Nazé, Yaël Morrell, Nidia Irene Barbá, Rodolfo Gamen, Roberto Claudio |
author_role |
author |
author2 |
Koenigsberger, Gloria Nazé, Yaël Morrell, Nidia Irene Barbá, Rodolfo Gamen, Roberto Claudio |
author2_role |
author author author author author |
dc.subject.none.fl_str_mv |
binaries: eclipsing stars: individual(HD 5980) stars: Wolf-Rayet stars: winds outflows stars: mass-loss |
topic |
binaries: eclipsing stars: individual(HD 5980) stars: Wolf-Rayet stars: winds outflows stars: mass-loss |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The Small Magellanic Cloud multiple system HD 5980 contains a luminous blue variable (LBV) that underwent a major eruption in 1994, and whose current spectrum is that of a hydrogen-rich Wolf-Rayet (WR) star. Since the eruption, the wind mass-loss rate has been declining while wind speeds have been steadily increasing. Observations obtained in 2014 when Star A (the LBV) eclipses Star B indicate that the fitted mass-loss rate and luminosity have reached the lowest values ever determined for such spectra: dot{M} = 4.5 × 10-5M_☉ yr^{-1}, L = 1.7 × 106 L☉. In addition, the radius of the LBV´s continuum-emitting region is similar to that derived from the eclipse light curves of the late 1970s. Hence, it appears to have attained a similar `low´ state to that of the late 1970s. While a good fit to the emission spectrum is obtained using a CMFGEN model, there are discrepancies in the UV. In particular, the extent of the observed absorption profiles is ̃1000 km s-1 greater than predicted by the emission-line intensities. Further, HST UV observations obtained in 2016, when Star A is eclipsed by Star B, show unusual P Cygni profiles that are not easily explained. Surprisingly the 2016 emission-line spectrum is similar to that at the opposite eclipse obtained in 2014. The complex UV profiles are likely to arise as a consequence of the dynamics of the wind-wind collision and radiative braking, both of which will cause significant departures from spherical symmetry, and have a strong orbital phase dependence. However, other scenarios, such as intrinsically aspherical winds, cannot be ruled out. Fil: Hillier, Desmond John. University of Pittsburgh; Estados Unidos Fil: Koenigsberger, Gloria. Universidad Nacional Autónoma de México; México Fil: Nazé, Yaël. Université de Liège; Bélgica Fil: Morrell, Nidia Irene. Carnegie Institution. Observatorio Las Campanas; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Barbá, Rodolfo. Universidad de La Serena; Chile Fil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina |
description |
The Small Magellanic Cloud multiple system HD 5980 contains a luminous blue variable (LBV) that underwent a major eruption in 1994, and whose current spectrum is that of a hydrogen-rich Wolf-Rayet (WR) star. Since the eruption, the wind mass-loss rate has been declining while wind speeds have been steadily increasing. Observations obtained in 2014 when Star A (the LBV) eclipses Star B indicate that the fitted mass-loss rate and luminosity have reached the lowest values ever determined for such spectra: dot{M} = 4.5 × 10-5M_☉ yr^{-1}, L = 1.7 × 106 L☉. In addition, the radius of the LBV´s continuum-emitting region is similar to that derived from the eclipse light curves of the late 1970s. Hence, it appears to have attained a similar `low´ state to that of the late 1970s. While a good fit to the emission spectrum is obtained using a CMFGEN model, there are discrepancies in the UV. In particular, the extent of the observed absorption profiles is ̃1000 km s-1 greater than predicted by the emission-line intensities. Further, HST UV observations obtained in 2016, when Star A is eclipsed by Star B, show unusual P Cygni profiles that are not easily explained. Surprisingly the 2016 emission-line spectrum is similar to that at the opposite eclipse obtained in 2014. The complex UV profiles are likely to arise as a consequence of the dynamics of the wind-wind collision and radiative braking, both of which will cause significant departures from spherical symmetry, and have a strong orbital phase dependence. However, other scenarios, such as intrinsically aspherical winds, cannot be ruled out. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-03-19 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/125384 Hillier, Desmond John; Koenigsberger, Gloria; Nazé, Yaël; Morrell, Nidia Irene; Barbá, Rodolfo; et al.; The enigmatic binary system HD 5980; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 486; 1; 19-3-2019; 725-742 0035-8711 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/125384 |
identifier_str_mv |
Hillier, Desmond John; Koenigsberger, Gloria; Nazé, Yaël; Morrell, Nidia Irene; Barbá, Rodolfo; et al.; The enigmatic binary system HD 5980; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 486; 1; 19-3-2019; 725-742 0035-8711 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/486/1/725/5393415 info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stz808 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Wiley Blackwell Publishing, Inc |
publisher.none.fl_str_mv |
Wiley Blackwell Publishing, Inc |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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