Discovery of a galactic supersoft binary X-ray source.

Details Discovery of a galactic supersoft binary X-ray source. Discovery of a galactic supersoft binary X-ray source.

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...294l...1b&link_type=abstract

Astronomy and Astrophysics 294L, L1-L4 (1995)

Astronomy and Astrophysics

Astrophysics

48

Accretion, X-Rays: General, Binaries: Close, Stars: Individual: Rxj0019.8+2156, White Dwarfs

Scientific paper

We report the discovery of the galactic very soft ('supersoft') X-ray source RXJ0019.8+2156 and its 12.2mag optical counterpart. The system displays quasi-sinusoidal modulations of the optical, UV, and X-ray light curves as well as regular radial-velocity variations with a 15.85 hour period which we interpret as the binary orbital period. The system shows little long-term variability (1990-1993) in the optical, W, and X-ray bands. The hot component may be a white dwarf which accretes at a rate of ~10^-7^Msun_/yr near the limit of stable burning of hydrogen. The system may currently be in a low state between weak shell flashes.

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