Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sci...205...31h&link_type=abstract
Science, vol. 205, July 6, 1979, p. 31-33.
Astronomy and Astrophysics
Astronomy
1
Heao 2, Spaceborne Astronomy, X Ray Astronomy, Hot Stars, Imaging Techniques, Quasars, Stellar Coronas, Stellar Radiation, Stellar Temperature, Surface Temperature, Telescopes, X Ray Sources
Scientific paper
HEAO 2 (Einstein), launched in November 1978 to scan the sky for X-ray emitters, is discussed. X-ray sources that have been found among virtually all types and ages of stars are examined, and special emphasis is given to the study of X-ray emitting quasars. A reexamination of existing coronal theories is suggested since HEAO 2 has shown that the hottest stars - those with surface temperatures near 35,000 K - emit X-rays from their coronas. The instruments on board the satellite which rival the visible-light capabilities of the largest optical telescopes, include a reflector, which is a sleevelike paraboloid-hyperboloid mirror, two imaging detectors, and two spectrometers. One detector is capable of imaging X-ray emitters with a spatial resolution of 3 arcsec while the second can discriminate between X-rays of different energies, producing a 'color-like' X-ray image, but has a spatial resolution of only 60 arcsec. The advantages of these instruments are discussed in detail.
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