TT Crateris: A Long-Period, Double-lined Dwarf Nova
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1992
- DOI:
- 10.1086/171088
- Bibcode:
- 1992ApJ...387..357S
- Keywords:
-
- Dwarf Novae;
- Late Stars;
- Light Curve;
- White Dwarf Stars;
- Balmer Series;
- Charge Coupled Devices;
- Emission Spectra;
- Stellar Spectrophotometry;
- Astrophysics;
- STARS: BINARIES: SPECTROSCOPIC;
- STARS: NOVAE;
- CATACLYSMIC VARIABLES;
- STARS: INDIVIDUAL CONSTELLATION NAME: TT CRATERIS