The peculiar M giant HD 154791. Optical counterpart of the X-ray source 4U1700+24

Details The peculiar M giant HD 154791. Optical counterpart of the X-ray source 4U1700+24 The peculiar M giant HD 154791. Optical counterpart of the X-ray source 4U1700+24

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347..473g&link_type=abstract

Astronomy and Astrophysics, v.347, p.473-477 (1999)

Astronomy and Astrophysics

Astrophysics

12

Line: Identification, Stars: Evolution, Stars: Individual: Hd 154791, Stars: Late-Type, Stars: Neutron, X-Rays: Stars

Scientific paper

HD 154791 is the only optical counterpart of an hard X-ray source (4U1700+24) with an apparently normal M giant spectrum. We present here new high S/N spectroscopic observations of this interesting and poorly studied object, pointing out a number of peculiarities never noticed before; therefore we derive a possible scenario involving a wide binary system, where an old, slowly rotating, neutron star is weekly interacting with its late optical companion. We foresee that this system could evolve, in a short time, into a normal LMXB. Based on data collected at the Loiano Observatory

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