2024-03-28T17:12:56Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1338252018-08-02T10:42:31Zcom_10261_97com_10261_4col_10261_350
2016-06-21T10:19:09Z
urn:hdl:10261/133825
The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel)
Gamen, R.
Barbá, R. H.
Walborn, N. R.
Morrell, N. I.
Arias, J. I.
Maíz Apellániz, Jesús
Sota Ballano, Alfredo
Alfaro, Emilio J.
European Commission
Ministerio de Economía y Competitividad (España)
Binaries: spectroscopic
Stars: individual: HD 74194
Stars: early-type
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.
2016-06-21T10:19:09Z
2016-06-21T10:19:09Z
2015
2016-06-21T10:19:09Z
artículo
Astronomy and Astrophysics 583 (2015)
http://hdl.handle.net/10261/133825
10.1051/0004-6361/201527140
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100003329
eng
Publisher's version
Sí
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2013-40611-P
openAccess
EDP Sciences