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- W2167146468 abstract "We report results of the spectroscopy for V725 Tau (HDE 245770, 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 1.5 m 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 5.9 1010 cm to 2.1 1011 cm, 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 & Ziółkowski (1990)." @default.
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- W2167146468 date "2007-06-18" @default.
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- W2167146468 title "HeI doubled emission lines from A0535+26 <i>≡</i> HDE 245770" @default.
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- W2167146468 doi "https://doi.org/10.1051/0004-6361:20066149" @default.
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