Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.270..499b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 270, NO. 3/OCT1, P. 499, 1994
Astronomy and Astrophysics
Astronomy
53
Scientific paper
A number of new non-interacting binary systems comprising a white dwarf plus a normal stellar companion have been discovered by the ROSA T X-ray and EUV sky surveys. We discuss the identification of nine of these objects, determine the temperatures and gravities of the white dwarfs, and compare their atmospheric compositions with the population of isolated white dwarfs. As a result, it may be possible to estimate how many hot white dwarfs in total reside in binary systems. Coronal emission is detected in several systems, and its nature, in the light of the likely age of the binaries, is discussed. These binary systems are important representatives of several possible evolutionary paths, including common-envelope and mass-transfer phases. Their further study will be of great importance in understanding stellar evolution in general, and binaries in particular. Key words: stars: atmospheres - binaries: general - white dwarfs - ultraviolet: stars - X-rays: stars.
Barstow Martin Adrian
Fleming Thomas Anthony
Holberg Jay Brian
Koester Detlev
Marsh M. C.
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