Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247l.127a&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 247, Aug. 1, 1981, p. L127-L130.
Astronomy and Astrophysics
Astrophysics
35
Giant Stars, Stellar Luminosity, Stellar Spectra, X Ray Sources, Binary Stars, Companion Stars, Emission Spectra, Line Spectra, Proportional Counters, X Ray Spectra
Scientific paper
The detection of the yellow symbiotic star AG Draconis is reported. The star was detected by an imaging proportional counter at a count rate of 0.27 counts/s. The object is an intense source of very soft X-rays, and the X-ray luminosity is estimated to be equal to approximately 10 to the 32nd ergs/s, with a temperature of less than 2,000,000 K. If an interstellar column density of 3 x 10 to the 20th/sq cm is assumed, the emission measure is deduced to be greater than 3 x 10 to the 55th/ cu cm from the X-ray data, and less than 3 x 10 to the 59th/cu cm from the optical data. The observation is discussed in the context of various models of the symbiotic stars.
Anderson Martha C.
Cassinelli Joe P.
Sanders Wilton T.
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