UBV images of the Z Cha accretion disc in outburst

Details UBV images of the Z Cha accretion disc in outburst UBV images of the Z Cha accretion disc in outburst

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.214..307h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 214, May 15, 1985, p. 307-317. Research supported by th

Astronomy and Astrophysics

Astronomy

87

Accretion Disks, Companion Stars, Dwarf Novae, Stellar Mass Ejection, Stellar Spectrophotometry, Ubv Spectra, Color-Magnitude Diagram, Radial Velocity, Red Dwarf Stars, Stellar Mass Accretion, Stellar Temperature, White Dwarf Stars

Scientific paper

Images of the accretion disc in the dwarf nova Z Cha are derived from UBV photometry of two eclipses obtained in the early stage of the 1983 March outburst. Two-colour and colour-magnitude diagrams for the accretion disc demonstrate that its surface consists of opaque thermal radiators. A distance of 105±20 (KR/400 km s-1) pc is derived, where KR is the assumed radial velocity semi-amplitude of the red dwarf companion star. Temperatures in the disc range from ≡7000K at its outer rim to ≡40000K near the white dwarf at its centre. The radial temperature profile is consistent with steady mass transfer at the rate 10-8.9±0.3M_sun;yr-1.

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