Other
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227..661c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, Aug. 1, 1987, p. 661-676. SERC-supported research.
Other
6
Pulsars, Stellar Spectra, X Ray Spectra, B Stars, Companion Stars, Exosat Satellite, H Alpha Line, Neutron Stars, Stellar Envelopes
Scientific paper
A series of observations of the X-ray pulsar 4U1145-619 were performed by EXOSAT during successive X-ray outbursts on this source in 1984 July and 1985 January. On all occasions the source exhibited a very hard power-law X-ray spectrum (photon spectral index ≡1.0) with a high-energy cut-off above ≡6 keV. The low-energy cut-off in the X-ray spectrum, in contrast to the other spectral parameters, exhibited significant variations over the observations. Optical spectroscopy of the Be star Hen 715, identified as the optical counterpart of 4U1145-619, was performed during the 1985 January X-ray outburst. The resulting spectra revealed a marked decrease in the strength of the broad blue component of the dominant Hα emission line as the X-ray outburst progressed. There was, however, no evidence for any pulse phase dependency or short-term variability in either the Hα of Hβ emission lines. These X-ray and optical observations are interpreted in terms of a neutron star passing through the circumstellar envelope of its Be companion.
Cook Cheryl M.
Warwick Robert S.
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