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Optical spectroscopy of Be/gamma-ray binaries

Zamanov, RK and Stoyanov, KA and Martí, J and Latev, GY and Nikolov, YM and Bode, MF and Luque-Escamilla, PL (2016) Optical spectroscopy of Be/gamma-ray binaries. Astronomy and Astrophysics, 593 (A97). ISSN 0004-6361

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Abstract

© ESO, 2016.We report optical spectroscopic observations of the Be/γ-ray binaries LSI+61303, MWC 148 and MWC 656. The peak separation and equivalent widths of prominent emission lines (Hα, Hβ, Hγ, HeI, and FeII) are measured. We estimated the circumstellar disc size, compared it with separation between the components, and discussed the disc truncation. We find that in LSI+61°303 the compact object comes into contact with the outer parts of the circumstellar disc at periastron, in MWC 148 the compact object goes deeply into the disc during the periastron passage, and in MWC 656 the black hole is accreting from the outer parts of the circumstellar disc along the entire orbit. The interstellar extinction was estimated using interstellar lines. The rotation of the mass donors appears to be similar to the rotation of the mass donors in Be/X-ray binaries. We suggest that X-ray/optical periodicity ~1 day deserves to be searched for.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Date Deposited: 13 Apr 2017 12:25
Last Modified: 13 Apr 2017 12:25
DOI or Identification number: 10.1051/0004-6361/201628735
URI: http://researchonline.ljmu.ac.uk/id/eprint/6256

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