2015A&A...583L...4G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:43:44

2015A&A...583L...4G - Astronomy and Astrophysics, volume 583, L4-4 (2015/11-1)

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

GAMEN R., BARBA R.H., WALBORN N.R., MORRELL N.I., ARIAS J.I., MAIZ-APELLANIZ J., SOTA A. and ALFARO E.J.

Abstract (from CDS):

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. 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. HD 74194 is a binary system composed of an O-type supergiant and a compact object in a short-period (P=9.5436±0.0002d) 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±10d) nearly 30 times longer than the orbital one.

Abstract Copyright:

Journal keyword(s): binaries: spectroscopic - stars: early-type - stars: individual: HD 74194

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 37737 SB* 05 42 31.1582447671 +36 12 00.505876189 8.02 8.30 8.06     O9.5II-III(n) 82 0
2 HD 74194 HXB 08 40 47.7915105936 -45 03 30.231146034 7.05 7.77 7.55 8.70   O8.5Ib-II(f)p 178 0
3 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1373 0
4 PSR J1518+0204B Psr 15 18 31.458 +02 05 15.47           ~ 37 1
5 PSR J1614-2230 Psr 16 14 36.5070 -22 30 31.207           ~ 277 1
6 PSR J1748-2446I Psr 17 48 04.9 -24 46 45           ~ 28 0
7 PSR J1959+2048 Psr 19 59 36.7480 +20 48 14.599   20.4       ~ 701 2

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:43:44

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