Radius, rotational period and inclination of the Be stars in the Be/gamma-ray binaries MWC 148 and MWC 656

Abstract

Using TESS photometry and Rozhen spectra of the Be/gamma-ray binaries MWC 148 and MWC 656, we estimate the projected rotational velocity ($v\sin i$), the rotational period (P${}_{\mathrm{rot}}$), radius (R${}_1$), and inclination ($i$) of the mass donor. For MWC 148 we derive P${}_{\mathrm{rot}}=1.10\pm 0.03$~d, R${}_1=9.2\pm 0.5$~R${}_{\odot }$, $i=40^{\circ }\pm 2^{\circ }$, and $v\sin i=272\pm 5$~km~s${}^{-1}$. For MWC 656 we obtain P${}_{\mathrm{rot}}=1.12\pm 0.03$~d, R${}_1=8.8\pm 0.5$~R${}_{\odot }$, $i=52^{\circ }\pm 3^{\circ }$, and $v\sin i=313\pm 3$~km~s${}^{-1}$. For MWC 656 we also find that the rotation of the mass donor is coplanar with the orbital plane.

6 pages, Accepted by Astronomische Nachrichten / Astronomical Notes

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Cited by in corpus (6)

• Observation of the gamma-ray binary HESS J0632+057 with the H.E.S.S., MAGIC, and VERITAS telescopes
• Fast time optical variability in Be/X-ray binaries. Pulsation and rotation
• Optical spectroscopy of the Be/black hole binary MWC656 -- interaction of a black hole with a circumstellar disc
• Optical and Near-Infrared Monitoring of Gamma-ray Binaries Hosting Be Stars
• Ultraviolet spectroscopy reveals a hot and luminous companion to the Be star+black hole candidate MWC 656
• X-ray imaging observations of the high-mass gamma-ray binary HESS J0632+057