SIMBAD references

2007A&A...475..651G - Astronomy and Astrophysics, volume 475, 651-657 (2007/11-4)

HeI doubled emission lines from A0535+26 = HDE245770. A possible interpretation.


Abstract (from CDS):

We report results of the spectroscopy for V725 Tau (HDE245770, BD+26°883), commonly known as Flavia's star, which is the optical counterpart of the X-ray pulsar A0535+26, carried out at the 1.5m Loiano telescope during one run of observations of this star spread over a period of years. The HeI emission lines clearly show doubling, which is good evidence for the presence of a disc. In this paper we critically discuss the possibility that this disc is a temporary accretion disc around the neutron star, a view that contrasts to the usual interpretation, which considers that this sort of doubling in the HeI emission lines is due to a disc formed by gas expelled from the Be star. In the former case the outer radius of the accretion disc could range from 5.9x1010cm to 2.1x1011cm, taking the most probable range into account for the orbital inclination of the binary system, from 35° to 39°. The presence of such a temporary accretion disc around the neutron star was predicted by Giovannelli & Ziolkowski (1990AcA....40...95G).

Abstract Copyright:

Journal keyword(s): X-rays: binaries - accretion, accretion disks - stars: emission line, Be - stars: binaries: close

Simbad objects: 8

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