Other
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982msngr..28...25k&link_type=abstract
ESO Messenger, June 1982, p. 25-28.
Other
3
Stellar Evolution, White Dwarf Stars, Star Clusters, Stellar Magnitude, Stellar Mass
Scientific paper
Observations and characteristics of white dwarf stars are described, with an emphasis on programs carried out at La Silla. White dwarfs are the end product of 90% of observable stars, with some exhibiting magnetic fields of up to 100 million gauss, and others associated with X ray emitting binaries. Having masses of 0.5 sun contained in a body the size of the earth, white dwarf stars do not feature nuclear reactions, but do possess gravitational energies and thermal reactions until totally cooled. Free electron pressure balancing gravitational forces prevents transition to neutron star status or collapse into a black hole. Estimation techniques for determining the critical star mass necessary for white dwarf formation are discussed. Observational programs to identify white dwarfs by Balmer hydrogen lines spread to 50 A width are noted, particularly the necessity of long integration times for photometric imagery when scanning the faint objects. The expected absolute magnitude of white dwarf stars has been calculated as about 20.
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