The nearest star of spectral type O3: A component of the multiple system HD 150136

From radial velocities determined in high signal-to-noise digital spectra, we report the discovery that the brightest component of the binary system HD 150136 is of spectral type O3. We also present the first double-lined orbital solution for this binary. Our radial velocities confirm the previously...

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Autores principales: Niemelä, Virpi Sinikka, Gamen, Roberto Claudio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2005
Materias:
Ciencias Astronómicas
Binaries: spectroscopic
Stars: individual: HD 150136
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83396
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83396
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: spectroscopic
Stars: individual: HD 150136
spellingShingle Ciencias Astronómicas
Binaries: spectroscopic
Stars: individual: HD 150136
Niemelä, Virpi Sinikka
Gamen, Roberto Claudio
The nearest star of spectral type O3: A component of the multiple system HD 150136
topic_facet Ciencias Astronómicas
Binaries: spectroscopic
Stars: individual: HD 150136
description From radial velocities determined in high signal-to-noise digital spectra, we report the discovery that the brightest component of the binary system HD 150136 is of spectral type O3. We also present the first double-lined orbital solution for this binary. Our radial velocities confirm the previously published spectroscopic orbital period of 2.6 d. He II absorptions appear double at quadratures, but single lines of N v and N IV visible in our spectra define a radial velocity orbit of higher semi-amplitude for the primary component than do the He II lines. From our orbital analysis, we obtain minimum masses for the binary components of 27 and 18 M⊙. The neutral He absorptions apparently do not follow the orbital motion of any of the binary components, thus they most probably arise in a third star in the system.
format Articulo
Articulo
author Niemelä, Virpi Sinikka
Gamen, Roberto Claudio
author_facet Niemelä, Virpi Sinikka
Gamen, Roberto Claudio
author_sort Niemelä, Virpi Sinikka
title The nearest star of spectral type O3: A component of the multiple system HD 150136
title_short The nearest star of spectral type O3: A component of the multiple system HD 150136
title_full The nearest star of spectral type O3: A component of the multiple system HD 150136
title_fullStr The nearest star of spectral type O3: A component of the multiple system HD 150136
title_full_unstemmed The nearest star of spectral type O3: A component of the multiple system HD 150136
title_sort nearest star of spectral type o3: a component of the multiple system hd 150136
publishDate 2005
url http://sedici.unlp.edu.ar/handle/10915/83396
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