Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977asaer..15...56l&link_type=abstract
Astronautics and Aeronautics, vol. 15, Apr. 1977, p. 56-63.
Astronomy and Astrophysics
Astronomy
Black Holes (Astronomy), Milky Way Galaxy, X Ray Astronomy, X Ray Stars, Bursts, Globular Clusters, Gravitational Effects, Oscillographs, Spaceborne Astronomy, Time Response
Scientific paper
Various observations of X-ray outbursts in our galaxy are discussed together with current hypotheses about the nature of their sources. The bright X-ray-emitting stars display a diversity of variability in X-ray luminosity on time scales of days, hours, minutes and even fractions of a second. Typically these sources are about 10,000 times more luminous than the Sun, which has a luminosity of approximately 3 times 10 to the power 33 erg/sec. Unlike the common visible stars, these objects radiate most of their energy in the form of X-rays (1-20 keV). The energy source of the X-ray stars is not nuclear fuel but rather gravitational potential energy released as gas falls onto a small but massive object such as white dwarf, neutron star, or black hole. A few of the best known examples are Herculus X-1, Centaurus X-3, Vela X-1, Cygnus X-1, and SMC X-1.
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