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 International Ultraviolet Explorer (IUE) shows that the white dwarf has an effective temperature of 23,000 +/- 2,000 K. If log g = 8 the Ly(alpha) profile indicates an effective temperature around 24,500 K. Using the theoretical models, one finds a visual magnitude of mv is approximately 16.5. For Teff = 24,500 K one expects for a white dwarf a luminosity of log L/solar luminosity is approximately -1.3 and MV is approximately 10.67. This gives a distance modulus for the system of mv - MV = 5.83 and an absolute magnitude Mv = 0.3 for the giant.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1980
- Bibcode:
- 1980STIN...9311075B
- Keywords:
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- Binary Stars;
- Luminosity;
- Stellar Magnitude;
- Stellar Models;
- Stellar Spectra;
- Stellar Temperature;
- White Dwarf Stars;
- Iue;
- Lyman Alpha Radiation;
- Mathematical Models;
- Ultraviolet Astronomy;
- Ultraviolet Spectra;
- Astronomy