RX J0439.8-6809: a double-degenerate supersoft X-ray source?

Details RX J0439.8-6809: a double-degenerate supersoft X-ray source? RX J0439.8-6809: a double-degenerate supersoft X-ray source?

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323l..41v&link_type=abstract

Astronomy and Astrophysics, v.323, p.L41-L44

Astronomy and Astrophysics

Astrophysics

14

Accretion, Stars: Individual: Rx J0439.8-6809, Stars: Post-Agb, White Dwarfs, X-Rays: Stars

Scientific paper

We present optical CCD photometry of the supersoft X-ray source RX J0439.8-6809. The absence of significant X-ray and optical variability (3σ peak-to-peak {DELTA}V<0.07) and the optical faintness (V~21.6) put severe constraints on a possible binary nature. Without rather unusual assumptions, a main-sequence donor star seems to be ruled out. All of the available information suggests that RX J0439 is either a double-degenerate supersoft X-ray source with a predicted orbital period of a few minutes or an extremely hot single pre-white dwarf. In either case, it is an extraordinarily rare and interesting object.

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