Spectral variability of He 3-640, optical counterpart of the X-ray source A 1118-61

Details Spectral variability of He 3-640, optical counterpart of the X-ray source A 1118-61 Spectral variability of He 3-640, optical counterpart of the X-ray source A 1118-61

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259l...1v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

8

B Stars, H Alpha Line, Spectral Line Width, X Ray Sources, Neutron Stars, Stellar Spectra, X Ray Binaries

Scientific paper

We have performed spectroscopic observations of the peculiar Be star He 3-640, the optical counterpart of the hard X-ray source A 1118-61, whose compact member is a 405 S pulsar. Our data show the presence of very short time variability of H-alpha equivalent width. We discuss the possible use of this kind of variability as an indicator of a Be/neutron star binary.

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