Identification of two hard X-ray emitting Be stars using the HEAO 1 scanning modulation collimator

Abstract

view Abstract Citations (27) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Identification of two hard X-ray emitting Be stars using the HEAO 1 scanning modulation collimator. Steiner, J. E. ; Ferrara, A. ; Garcia, M. ; Patterson, J. ; Schwartz, D. A. ; Warwick, R. S. ; Watson, M. G. ; McClintock, J. E. Abstract Using precise positions from the HEAO 1 Scanning Modulation Collimator experiment, two hard X-ray sources, 4U 0728 - 25 = 3A 0726 - 260 and 4U 2206 + 54 = 3A 2206 + 543, are identified with early-type stars. In both cases broad (10 A FWHM) H-alpha emission is detected. The UBV colors suggest that the optical counterparts are main-sequence B0-B2 stars at 2-6 kpc, implying a mean X-ray luminosity of order 10 to the 35th ergs/sq cm s (2-10 keV). The X-ray emission in both cases is highly variable, and it is suggested that they belong to the class of X-ray emitting Be stars, containing a neutron star in a widely separated binary system. Publication: The Astrophysical Journal Pub Date: May 1984 DOI: 10.1086/162042 Bibcode: 1984ApJ...280..688S Keywords: B Stars; Variable Stars; X Ray Sources; X Ray Stars; Collimators; Heao 1; Stellar Spectra; Astrophysics full text sources ADS | data products SIMBAD (2)