2016/05/31 by R. K. Zamanov, R. Zamanov, K. A. Stoyanov +9 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Extinction (optical mineralogy) #Galaxy #Gamma-ray bursts and supernovae #Geometry #Interstellar medium #Optics #Orbit (dynamics) #Physics #Pulsars and Gravitational Waves Research #Rotation (mathematics) #Spectroscopy #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361/201628735
published as A&A 593, A97 (2016) · 9 pages, accepted in A&A
arxiv created 2016/07/19 · openalex publication_date 2016/07/19 · arxiv updated 2016/10/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.