Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..961c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 15, 1986, p. 961-973. SERC-supported research
Astronomy and Astrophysics
Astronomy
23
Binary Stars, Neutron Stars, Periodic Variations, Stellar Evolution, B Stars, Stellar Envelopes, Stellar Flares, X Ray Sources
Scientific paper
Optical spectroscopy and photometry of the Be/neutron star binary system 4U 1258-61 obtained over the period 1977-83 are presented. Evidence is found for the evolution of a circumstellar envelope through the course of the observations with a decline in optical activity resulting in a state with no visible H-alpha emission. This may be related to a recent cessation of X-ray emission from the source. X-ray observations made with the Ariel V and Copernicus satellites between 1975 and 1979 are also presented. An X-ray flare seen with Ariel V is consistent with the proposed 133 day period for this system. The ratio of the strengths of the blue and red components of the double-peaked H-alpha emission line shows considerable variability and may be modulated at the X-ray flare period. Models which may explain some of the observed properties of 4U 1258-61 are discussed.
Booth Linda
Branduardi-Raymont Graziella
Charles Phil A.
Corbet Robin H. D.
Mason Keith O.
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