Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ncimc..13..481d&link_type=abstract
Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 13 C, Mar.-Apr. 1990, p. 481-487. Research supported by CNR.
Astronomy and Astrophysics
Astronomy
7
Ultraviolet Astronomy, X Ray Sources, Exosat Satellite, Iue, Visible Spectrum
Scientific paper
Results from multifrequency observations of the X-ray source 4U1700 + 24/HD154791 is reported. This source was observed simultaneously with the Exosat and IUE satellites on March 25, 1985, and it is continuously monitored in the optical band at the Bologna Astronomical Observatory since July 1984. The observations show source features which are different from those measured during previous observations. The X-ray spectrum is significantly softer than in previous measurements, and much more absorbed; high excitation lines in UV spectra (C IV and N V) have disappeared; the optical spectrum, despite a fairly good photometric stability of the M giant HD154791 in V and B bands also shows differences with respect to previous observations. Results in the framework of both a binary model and a coronal model are discussed. The observations strengthen the hypothesis that the X-ray emission is due to mass accretion onto a compact object orbiting around the M giant star HD154791.
dal Fiume Daniele
Frontera Filippo
Manzo Giuseppe
Poulsen Jens Michael
Re Stefano
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