The discovery of 'Sco X-1 type' behaviour from the X-ray burster 4U 1735 - 44

Details The discovery of 'Sco X-1 type' behaviour from the X-ray burster 4U 1735 - 44 The discovery of 'Sco X-1 type' behaviour from the X-ray burster 4U 1735 - 44

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193..731w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 193, Dec. 1980, p. 731-736.

Astronomy and Astrophysics

Astronomy

15

Eclipsing Binary Stars, Stellar Spectra, X Ray Sources, Ariel 5 Satellite, H Beta Line, Stellar Luminosity

Scientific paper

A series of Copernicus, Ariel V and optical observations of the X-ray burst source 4U 1735 - 44 (= MXB 1735 - 44) revealed properties very similar to those of the 'Sco X-1 like' sources. During one run, the non-burst X-ray flux varied by a factor of 2 on a time-scale of hours and this was associated with a general hardening of the spectrum. The source was relatively constant throughout the remaining observations. An Ariel V spectrum obtained during a quiescent interval deviated from a simple thermal model in that it showed both a high energy deficiency and a low energy excess. Near simultaneous spectroscopy of the optical counterpart confirmed the general features reported by McClintock et al. Spectra taken on successive nights revealed the H-beta emission to be variable.

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