Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202l...9c&link_type=abstract
Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 2, p. L9-L12.
Astronomy and Astrophysics
Astronomy
15
Giant Stars, Stellar Atmospheres, Stellar Mass Ejection, X Ray Astronomy, X Ray Stars, Coronas, Mass Transfer, Proportional Counters, Rocket Flight
Scientific paper
Sensitive X-ray observations have been obtained of alpha Boo and alpha CMi using rocket-borne large area proportional counters. No flux was detected from either star, yielding limits on intrinsic luminosity in the 75-2000 eV band (6-165 A) as stringent as 10 to the 28-th power ergs per sec depending upon assumed coronal temperature. These are at least an order of magnitude better limits than previously reported values. Upper limits are also set on a mass loss rate of three billionths solar mass per year and on an emission measure of less than 3 times 10 to the 53-rd power per cu cm. If these stars are typical, then giants and subgiants cannot be responsible for a significant fraction of the soft component of the diffuse X-ray background.
Bowyer Stuart
Cruddace Ray
Lampton Michael
Malina Roger
Margon Bruce
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