The K dwarfs associated with the X-ray transients A0620-00 and A1742-28
- 1 October 1980
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 192 (4) , 709-717
- https://doi.org/10.1093/mnras/192.4.709
Abstract
Spectra of A0620-00 taken in 1978, two and a half years after its outburst, show a stellar continuum of type K4–5 V and emission lines characteristic of an accretion disc. The Hβ emission was double with a peak-to-peak separation of 1200 km s−1 in 1978 January and 1080 km s−1 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 A1742-28 show it to be K3V. We suggest 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.Keywords
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