TT Crateris - A long-period, double-lined dwarf nova

Details TT Crateris - A long-period, double-lined dwarf nova TT Crateris - A long-period, double-lined dwarf nova

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387..357s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 1, 1992, p. 357-363.

Astronomy and Astrophysics

Astrophysics

14

Dwarf Novae, Late Stars, Light Curve, White Dwarf Stars, Balmer Series, Charge Coupled Devices, Emission Spectra, Stellar Spectrophotometry

Scientific paper

Time-resolved CCD photometry and spectroscopy of the dwarf nova TT Crt during quiescence are presented. The spectra reveal Balmer emission as well as absorption features of a K5-M0 secondary. The B, V, R light curves are dominated by a periodic variation of full amplitude 0.35 mag in V, which are interpreted as the ellipsoidal variation of the secondary star. The remarkably large amplitude indicates a high inclination (50-65 deg) and a massive white dwarf M greater than 0.8 solar mass. The ratio of the radial velocity semiamplitudes of the primary to the secondary is 0.5-1.4. The best period that can be determined from the observations is 438.17 minutes, with a possible alias at 445 minutes.

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