Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18710402l&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #104.02; Bulletin of the American Astronomical Society, Vol. 27, p.1434
Astronomy and Astrophysics
Astronomy
Scientific paper
Presented here are photometric data for the soft X-ray transient A0620-00, from observations made regularly since 1981 in the I and B+V bands. The orbital light curves obtained have been fitted to an ellipsoidal binary model containing a K4-K5 dwarf and a compact object. The best-fitting value for the orbital inclination angle, i, is strongly dependent on light contributions from an accretion disk; for this reason the fitting was done for a range of possible disk contributions. The resulting range of inclination is 42(deg) <= i <= 63(deg) . When combined with previously published results for the mass function, f(M, i) = 2.91 +/- 0.08 Msun, this inclination range implies a mass range of 4.9 - 11.6 Msun for the compact primary. These results strengthen the case made earlier that A0620-00 contains a black hole. The secular variability of the photometric light curves has also been studied. Variations on the order of 10% are apparent, and a phase variation of 180(deg) on a two-year timescale was observed. No straightforward explanation of this behaviour has yet been proposed.
Lane Benjamin
McClintock Jeff E.
Remillard Ron A.
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