Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary

Autores
Niemelä, Virpi Sinikka; Morrell, Nidia Irene; Fernández Lajús, Eduardo Eusebio; Barbá, Rodolfo Héctor; Albacete Colombo, Juan Facundo; Orellana, Mariana Dominga
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We report the discovery of a new O-type double-lined spectroscopic binary with a short orbital period of 1.4 d. We find the primary component of this binary, FO 15, to have an approximate spectral type O5.5Vz, i.e. a zero-age main-sequence (ZAMS) star. The secondary appears to be of spectral type O9.5V. We have performed a numerical model fit to the public All Sky Automated Survey photometry, which shows that FO 15 is also an eclipsing binary. We find an orbital inclination of ∼80°. From a simultaneous light curve and radial velocity solution, we find the masses and radii of the two components to be 30 ± 1 and 16 ± 1 M⊙ and 7.5 ± 0.5 and 5.3 ± 0.5 R⊙. These radii, and hence also the luminosities, are smaller than those of normal O-type stars, but similar to recently born ZAMS O-type stars. The absolute magnitudes derived from our analysis locate FO 15 at the same distance as η Carinæ. From Chandra and XMM X-ray images, we also find that there are two close X-ray sources: one coincident with FO 15 and the other one without optical counterpart. The latter seems to be a highly variable source, presumably due to a pre-main-sequence stellar neighbour of FO 15.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Binaries: eclipsing
Binaries: spectroscopic
Stars: fundamental parameters
Stars: individual: FO 15
X-rays: stars
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/83104

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network_name_str SEDICI (UNLP)
spelling Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binaryNiemelä, Virpi SinikkaMorrell, Nidia IreneFernández Lajús, Eduardo EusebioBarbá, Rodolfo HéctorAlbacete Colombo, Juan FacundoOrellana, Mariana DomingaCiencias AstronómicasBinaries: eclipsingBinaries: spectroscopicStars: fundamental parametersStars: individual: FO 15X-rays: starsWe report the discovery of a new O-type double-lined spectroscopic binary with a short orbital period of 1.4 d. We find the primary component of this binary, FO 15, to have an approximate spectral type O5.5Vz, i.e. a zero-age main-sequence (ZAMS) star. The secondary appears to be of spectral type O9.5V. We have performed a numerical model fit to the public All Sky Automated Survey photometry, which shows that FO 15 is also an eclipsing binary. We find an orbital inclination of ∼80°. From a simultaneous light curve and radial velocity solution, we find the masses and radii of the two components to be 30 ± 1 and 16 ± 1 M⊙ and 7.5 ± 0.5 and 5.3 ± 0.5 R⊙. These radii, and hence also the luminosities, are smaller than those of normal O-type stars, but similar to recently born ZAMS O-type stars. The absolute magnitudes derived from our analysis locate FO 15 at the same distance as η Carinæ. From Chandra and XMM X-ray images, we also find that there are two close X-ray sources: one coincident with FO 15 and the other one without optical counterpart. The latter seems to be a highly variable source, presumably due to a pre-main-sequence stellar neighbour of FO 15.Facultad de Ciencias Astronómicas y Geofísicas2006info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf1450-1456http://sedici.unlp.edu.ar/handle/10915/83104enginfo:eu-repo/semantics/altIdentifier/issn/0035-8711info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2006.10046.xinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-22T16:56:37Zoai:sedici.unlp.edu.ar:10915/83104Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 16:56:37.338SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary
title Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary
spellingShingle Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary
Niemelä, Virpi Sinikka
Ciencias Astronómicas
Binaries: eclipsing
Binaries: spectroscopic
Stars: fundamental parameters
Stars: individual: FO 15
X-rays: stars
title_short Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary
title_full Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary
title_fullStr Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary
title_full_unstemmed Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary
title_sort Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary
dc.creator.none.fl_str_mv Niemelä, Virpi Sinikka
Morrell, Nidia Irene
Fernández Lajús, Eduardo Eusebio
Barbá, Rodolfo Héctor
Albacete Colombo, Juan Facundo
Orellana, Mariana Dominga
author Niemelä, Virpi Sinikka
author_facet Niemelä, Virpi Sinikka
Morrell, Nidia Irene
Fernández Lajús, Eduardo Eusebio
Barbá, Rodolfo Héctor
Albacete Colombo, Juan Facundo
Orellana, Mariana Dominga
author_role author
author2 Morrell, Nidia Irene
Fernández Lajús, Eduardo Eusebio
Barbá, Rodolfo Héctor
Albacete Colombo, Juan Facundo
Orellana, Mariana Dominga
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Binaries: eclipsing
Binaries: spectroscopic
Stars: fundamental parameters
Stars: individual: FO 15
X-rays: stars
topic Ciencias Astronómicas
Binaries: eclipsing
Binaries: spectroscopic
Stars: fundamental parameters
Stars: individual: FO 15
X-rays: stars
dc.description.none.fl_txt_mv We report the discovery of a new O-type double-lined spectroscopic binary with a short orbital period of 1.4 d. We find the primary component of this binary, FO 15, to have an approximate spectral type O5.5Vz, i.e. a zero-age main-sequence (ZAMS) star. The secondary appears to be of spectral type O9.5V. We have performed a numerical model fit to the public All Sky Automated Survey photometry, which shows that FO 15 is also an eclipsing binary. We find an orbital inclination of ∼80°. From a simultaneous light curve and radial velocity solution, we find the masses and radii of the two components to be 30 ± 1 and 16 ± 1 M⊙ and 7.5 ± 0.5 and 5.3 ± 0.5 R⊙. These radii, and hence also the luminosities, are smaller than those of normal O-type stars, but similar to recently born ZAMS O-type stars. The absolute magnitudes derived from our analysis locate FO 15 at the same distance as η Carinæ. From Chandra and XMM X-ray images, we also find that there are two close X-ray sources: one coincident with FO 15 and the other one without optical counterpart. The latter seems to be a highly variable source, presumably due to a pre-main-sequence stellar neighbour of FO 15.
Facultad de Ciencias Astronómicas y Geofísicas
description We report the discovery of a new O-type double-lined spectroscopic binary with a short orbital period of 1.4 d. We find the primary component of this binary, FO 15, to have an approximate spectral type O5.5Vz, i.e. a zero-age main-sequence (ZAMS) star. The secondary appears to be of spectral type O9.5V. We have performed a numerical model fit to the public All Sky Automated Survey photometry, which shows that FO 15 is also an eclipsing binary. We find an orbital inclination of ∼80°. From a simultaneous light curve and radial velocity solution, we find the masses and radii of the two components to be 30 ± 1 and 16 ± 1 M⊙ and 7.5 ± 0.5 and 5.3 ± 0.5 R⊙. These radii, and hence also the luminosities, are smaller than those of normal O-type stars, but similar to recently born ZAMS O-type stars. The absolute magnitudes derived from our analysis locate FO 15 at the same distance as η Carinæ. From Chandra and XMM X-ray images, we also find that there are two close X-ray sources: one coincident with FO 15 and the other one without optical counterpart. The latter seems to be a highly variable source, presumably due to a pre-main-sequence stellar neighbour of FO 15.
publishDate 2006
dc.date.none.fl_str_mv 2006
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/83104
url http://sedici.unlp.edu.ar/handle/10915/83104
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0035-8711
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2006.10046.x
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
1450-1456
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instname:Universidad Nacional de La Plata
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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