The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)

Aims. We present the first orbital solution for the O-type supergiant star HD 74194, which is the optical counterpart of the supergiant fast X-ray transient IGR J08408-4503. Methods. We measured the radial velocities in the optical spectrum of HD 74194, and we determined the orbital solution for t...

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Detalles Bibliográficos
Autores principales:	Gamen, Roberto Claudio, Barbá, Rodolfo Héctor, Walborn, N. R., Morrell, Nidia Irene, Arias, Julia Inés, Maíz Apellániz, J., Sota, A., Alfaro, E. J.
Formato:	Articulo Contribucion a revista
Lenguaje:	Inglés
Publicado:	2015
Materias:	Ciencias Astronómicas Binaries: spectroscopic Stars: early-type Stars: individual: HD 74194
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/86912
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-86912
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: early-type Stars: individual: HD 74194
spellingShingle	Ciencias Astronómicas Binaries: spectroscopic Stars: early-type Stars: individual: HD 74194 Gamen, Roberto Claudio Barbá, Rodolfo Héctor Walborn, N. R. Morrell, Nidia Irene Arias, Julia Inés Maíz Apellániz, J. Sota, A. Alfaro, E. J. The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)
topic_facet	Ciencias Astronómicas Binaries: spectroscopic Stars: early-type Stars: individual: HD 74194
description	Aims. We present the first orbital solution for the O-type supergiant star HD 74194, which is the optical counterpart of the supergiant fast X-ray transient IGR J08408-4503. Methods. We measured the radial velocities in the optical spectrum of HD 74194, and we determined the orbital solution for the first time. We also analysed the complex Hα profile. Results. HD 74194 is a binary system composed of an O-type supergiant and a compact object in a short-period (P = 9.5436 ± 0.0002 d) and high-eccentricity (e = 0.63 ± 0.03) orbit. The equivalent width of the Hα line is not modulated entirely with the orbital period, but seems to vary in a superorbital period (P = 285 ± 10 d) nearly 30 times longer than the orbital one.
format	Articulo Contribucion a revista
author	Gamen, Roberto Claudio Barbá, Rodolfo Héctor Walborn, N. R. Morrell, Nidia Irene Arias, Julia Inés Maíz Apellániz, J. Sota, A. Alfaro, E. J.
author_facet	Gamen, Roberto Claudio Barbá, Rodolfo Héctor Walborn, N. R. Morrell, Nidia Irene Arias, Julia Inés Maíz Apellániz, J. Sota, A. Alfaro, E. J.
author_sort	Gamen, Roberto Claudio
title	The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)
title_short	The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)
title_full	The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)
title_fullStr	The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)
title_full_unstemmed	The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)
title_sort	eccentric short-period orbit of the supergiant fast x-ray transient hd 74194 (=lm vel)
publishDate	2015
url	http://sedici.unlp.edu.ar/handle/10915/86912
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The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)

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