The Photometric Period of 39 Ay-Ceti
Abstract
Photoelectric photometry obtained in 1971 and 1972 is compared with that obtained in 1980 81 and 1981 82 to derive a photometric period of 77 d .65. JD 2444636.0 is an epoch of minimum light. The full amplitude has been as large as 0 m .18 inV. Curiously, the mean light level has dropped by almost 0 m .2 over the last ten years. This binary is additionally interesting because of the recently discovered white dwarf secondary component and because unpublished radial velocity measures of Fekel show a large (0.1) eccentricity and an orbital period (57 d .1) very different from our photometric period.
- Publication:
-
Astrophysics and Space Science
- Pub Date:
- June 1983
- DOI:
- 10.1007/BF00648735
- Bibcode:
- 1983Ap&SS..93..271E
- Keywords:
-
- Binary Stars;
- Electrophotometry;
- Light Curve;
- Ubv Spectra;
- Variable Stars;
- White Dwarf Stars;
- Ephemerides;
- Orbital Elements;
- Radial Velocity;
- Stellar Magnitude;
- Stellar Rotation;
- Astronomy