Other
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.263...34m&link_type=abstract
Nature, vol. 263, Sept. 2, 1976, p. 34-36.
Other
22
Astronomical Spectroscopy, Spectrum Analysis, X Ray Sources, X Ray Spectra, Binary Stars, Early Stars, Pulsars, Variable Stars, X Ray Stars
Scientific paper
The subdivision of transient X-ray sources into hard-spectrum sources which show little spectral evolution and soft-spectrum sources which exhibit marked softening in time is discussed in relation to various properties of the following seven sources: Cen X-4, 3U 1543-47, A1524-62, A1118-61, A1743-28, A0535 plus 26, and A0620-00. X-ray spectra are obtained for A1524-62 and A0535 plus 26; their spectral properties are summarized along with those of the other five sources. It is shown that A1118-61 and A0535 plus 26 both have very hard spectra which do not show strong variation with phase, exhibit regular pulsation, and have (high-mass) Be stars as proposed optical counterparts. For the other five sources, there is evidence that the spectra have evolved from a hard to a soft state, pulsation has not been observed, and available optical identifications indicate low-mass companions. It is suggested that a significant correlation exists for X-ray transients among the occurrence of pulsation, hardness of the X-ray spectrum, and association with systems containing bright early-type stars.
Huckle Howard E.
Ives J. C.
Maraschi Laura
Sanford Peter W.
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