Physical properties and evolution of the two white dwarfs in the Sanduleak-Pesch binary.
Abstract
An important new binary white dwarf has been found by Sanduleak and Pesch. The stars are analyzed with the data from the Palomar double CCD spectrograph, using continuum fluxes, lines profiles, and Balmer decrements. They have hydrogen atmospheres, are young Population I, age ≈5×108 yr, temperatures of 12500K and 9500K, and the same visual magnitude. The cooler and less luminous star, B, has the larger radius and lower mass; B started its degenerate cooling, more recently, as the brighter of the pair. The estimated cooling times differ by approximately 108 yr. The white dwarfs, with masses 0.80 and 0.43 m_sun;, are descended from progenitors of 8 and 4 m_sun; (or 5 and 3.5 m_sun;).
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1983
- Bibcode:
- 1983A&A...127...25G
- Keywords:
-
- Binary Stars;
- Physical Properties;
- Radiant Cooling;
- Stellar Evolution;
- White Dwarf Stars;
- Balmer Series;
- Line Shape;
- Stellar Spectrophotometry;
- Astrophysics