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 supergiantstar HD 74194, which is the optical counterpart of the supergiant fastX-ray transient IGR J08408-4503. Methods. We measured the radialvelocities in the optical spectrum of HD 74194, and we determined theorbital solution for the first time. We also analysed the complexHα profle. Results. HD 74194 is a binary system composed of anO-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 withthe orbital period, but seems to vary in a superorbital period (P=285± 10 d) nearly 30 times longer than the orbital one.

Palabras clave: Spectroscopic Binaries , Early Type Stars , Hd 74194 (Estrella)

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Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)

Identificadores

URI: http://hdl.handle.net/11336/11237

DOI: http://dx.doi.org/10.1051/0004-6361/201527140

URL: http://www.aanda.org/articles/aa/abs/2015/11/aa27140-15/aa27140-15.html

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Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA

Citación

Gamen, Roberto Claudio; Barba, Rodolfo Hector; Walborn, N. R.; Morrell, Nidia Irene; Arias, Julia Ines; et al.; The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel); Edp Sciences; Astronomy And Astrophysics; 583; 11-2015; 4-7

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