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X-ray emission from the Pleiades clusterThe detection and identification of H0344+24, a new X-ray source located in the Pleiades cluster, is reported, based on observations made with HEAO A-2 low-energy detector 1 in the 0.15-3.0-keV energy band in August, 1977. The 90-percent-confidence error box for the new source is centered at 03 h 44.1 min right ascension (1950), near the center star of the 500-star Pleiades cluster, 25-eta-Tau. Since no likely galactic or extragalactic source of X-rays was found in a catalog search of the error-box region, identification of the source with the Pleiades cluster is considered secure. X-ray luminosity of the source is calculated to be about 10 to the 32nd ergs/sec, based on a distance of 125 pc. The X-ray characteristics of the Pleiades stars are discussed, and it is concluded that H0344+24 can best be explained as the integrated X-ray emission of all the B and F stars in the cluster.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Agrawal, P. C. (Tata Inst. of Fundamental Research Bombay, India)
Singh, K. P. (Tata Institute of Fundamental Research Bombay, India)
Riegler, G. R. (California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Date Acquired
August 11, 2013
Publication Date
May 1, 1983
Publication Information
Publication: Astrophysics and Space Science
Volume: 92
Issue: 1 Ma
ISSN: 0004-640X
Subject Category
Funding Number(s)
Distribution Limits