Physical properties and evolution of the two white dwarfs in the Sanduleak-Pesch binary

Details Physical properties and evolution of the two white dwarfs in the Sanduleak-Pesch binary Physical properties and evolution of the two white dwarfs in the Sanduleak-Pesch binary

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127...25g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 1, Oct. 1983, p. 25-28.

Astronomy and Astrophysics

Astrophysics

13

Binary Stars, Physical Properties, Radiant Cooling, Stellar Evolution, White Dwarf Stars, Balmer Series, Line Shape, Stellar Spectrophotometry

Scientific paper

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;).

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