The K dwarfs associated with the X-ray transients A 0620-00 and 7A 1742-28.
Abstract
Spectra of A 0620-00 taken in 1978, two and a half years after its outburst, show a stellar continuum of type K4-5V and emission lines characteristic of an accretion disc. The H beta emission was double with a peak-to-peak separation of 1200 km/s in 1978 January and 1080 km/s in March. The emission lines strengthened relative to the continuum between 1976 and 1978. The spectral type is confirmed by infrared (J, H, K) photometry. Spectra of a star positionally coincident with the radio transient associated with A 1742-28 show it to be K3V. It is suggested that there is a class of X-ray transients consisting of a cool dwarf star and an accretion disc around an unseen companion, similar to the common model for dwarf novae.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 1980
- DOI:
- 10.1093/mnras/192.4.709
- Bibcode:
- 1980MNRAS.192..709M
- Keywords:
-
- Dwarf Stars;
- K Lines;
- K Stars;
- Novae;
- Stellar Spectra;
- Stellar Spectrophotometry;
- X Ray Sources;
- Binary Stars;
- Emission Spectra;
- Late Stars;
- Light Curve;
- Stellar Mass Accretion;
- Stellar Models;
- Astrophysics