Detection of a White Dwarf in a Visual Binary System
Abstract
The F6 giant HD 160365 was detected to have a white dwarf companion about 8 arcsec south of the star. The UV energy distribution observed with IUE shows that the white dwarf has an effective temperature of 23,000 +/- 2000 K. If log g = 8 the Lya profile indicates an effective temperature around 24,500 K. Using the theoretical models by Wesemael et al. (1980) one finds a visual magnitude of m(V) about 16.5. For T(eff) = 24,500 K one expects for a white dwarf a luminosity of log L/L(solar) about 1.3 and M(V) about 10.67. This gives a distance modulus for the system of m(V) - M(V) = 5.83 and an absolute magnitude M(V)= 0.3 for the giant.
- Publication:
-
The Astronomical Journal
- Pub Date:
- October 1992
- DOI:
- 10.1086/116338
- Bibcode:
- 1992AJ....104.1539B
- Keywords:
-
- Binary Stars;
- Dwarf Stars;
- Stellar Magnitude;
- Stellar Spectrophotometry;
- Stellar Temperature;
- Energy Distribution;
- Iue;
- Lyman Alpha Radiation;
- Stellar Luminosity;
- Astrophysics;
- BINARIES: VISUAL;
- WHITE DWARFS