Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary
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...
Guardado en:
| Autores principales: | , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2006
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/83104 |
| Aporte de: |
| id |
I19-R120-10915-83104 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas Binaries: eclipsing Binaries: spectroscopic Stars: fundamental parameters Stars: individual: FO 15 X-rays: stars |
| spellingShingle |
Ciencias Astronómicas Binaries: eclipsing Binaries: spectroscopic Stars: fundamental parameters Stars: individual: FO 15 X-rays: stars Niemelä, Virpi Sinikka Morrell, Nidia Irene Fernández Lajús, Eduardo Eusebio Barbá, Rodolfo Héctor Albacete Colombo, Juan Facundo Orellana, Mariana Dominga Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary |
| topic_facet |
Ciencias Astronómicas Binaries: eclipsing Binaries: spectroscopic Stars: fundamental parameters Stars: individual: FO 15 X-rays: stars |
| 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. |
| format |
Articulo Articulo |
| author |
Niemelä, Virpi Sinikka Morrell, Nidia Irene Fernández Lajús, Eduardo Eusebio Barbá, Rodolfo Héctor Albacete Colombo, Juan Facundo Orellana, Mariana Dominga |
| author_facet |
Niemelä, Virpi Sinikka Morrell, Nidia Irene Fernández Lajús, Eduardo Eusebio Barbá, Rodolfo Héctor Albacete Colombo, Juan Facundo Orellana, Mariana Dominga |
| author_sort |
Niemelä, Virpi Sinikka |
| title |
Optical spectroscopy of X-mega targets in the Carina nebula : VI. FO 15: A new O-type double-lined eclipsing binary |
| 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 |
| publishDate |
2006 |
| url |
http://sedici.unlp.edu.ar/handle/10915/83104 |
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