The K dwarfs associated with the X-ray transients A0620-00 and A1742-28

Details The K dwarfs associated with the X-ray transients A0620-00 and A1742-28 The K dwarfs associated with the X-ray transients A0620-00 and A1742-28

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192..709m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 192, Sept. 1980, p. 709-717.

Astronomy and Astrophysics

Astronomy

28

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

Scientific paper

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.

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