| Title: |
The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel) |
| Authors: |
Gamen, R., Barbá, R. H., Walborn, N. R., Morrell, N. I., Arias, J. I., Apellániz, J. Maíz, Sota, A., Alfaro, E. J. |
| Source: |
A&A 583, L4 (2015) |
| Publication Year: |
2015 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Solar and Stellar Astrophysics |
| More Details: |
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 H{\alpha} profile. Results. HD 74194 is a binary system composed of an O-type supergiant and a compact object in a short-period ($P=9.5436\pm0.0002$ d) and high-eccentricity ($e=0.63\pm0.03$) orbit. The equivalent width of the H{\alpha} line is not modulated entirely with the orbital period, but seems to vary in a superorbital period ($P=285\pm10$ d) nearly 30 times longer than the orbital one.
Comment: 4 pages, 6 figures, accepted for publication in A&A |
| Document Type: |
Working Paper |
| DOI: |
10.1051/0004-6361/201527140 |
| Access URL: |
http://arxiv.org/abs/1510.06584 |
| Accession Number: |
edsarx.1510.06584 |
| Database: |
arXiv |
