A model of object Geminga as a degenerate white dwarf orbiting around a black hole

Details A model of object Geminga as a degenerate white dwarf orbiting around a black hole A model of object Geminga as a degenerate white dwarf orbiting around a black hole

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.315..555b&link_type=abstract

Nature (ISSN 0028-0836), vol. 315, June 13, 1985, p. 555-557.

Astronomy and Astrophysics

Astronomy

11

Black Holes (Astronomy), Gamma Ray Astronomy, Gravitational Waves, Kepler Laws, Roche Limit, White Dwarf Stars, Main Sequence Stars, Mass Transfer, Neutron Stars, Supernovae

Scientific paper

Geminga (2CG 195+04)is a very bright γ-ray source. It has been recently identified with X-ray and optical sources. The observed periodicity is P ≈ 1 min and it changes at a rate corresponding to a doubling time of about several hundred years. The author proposes here a model which consists of a degenerate dwarf (Md = 0.6 M_sun;) filling its Roche lobe and orbiting a black hole (Mbh = 4.4 M_sun;) with a period P = 1 min. Gravitational radiation dissipates the angular momentum, which leads to mass transfer with a current rate ≡10-3M_sun;yr-1 and a period change Pwhich agrees with the observed value.

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