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A New Interpretation of the Low Radial Velocity Determined from the HeII Emission Line in the Galactic Supersoft X-Ray Source RX J0019.8+2156

Published online by Cambridge University Press:  22 February 2018

Izumi Hachisu  and
Mariko Kato
Izumi Hachisu
Affiliation:
Department of Earth Science and Astronomy, University of Tokyo, Japan 153-8902 ([email protected])
Mariko Kato
Affiliation:
Department of Astronomy, Keio University, Japan 223-8521 ([email protected])

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We propose a new interpretation for the low radial velocity of He II emission line in the Galactic supersoft X-ray source RX J0019.8+2156 based on a 2-D numerical simulation of dynamical mass transfer in binary systems. A more massive main-sequence (MS) companion of ~ 2.0 M⊙ is derived for a ~ 0.6 M⊙ white dwarf (WD) primary.

The Galactic supersoft X-ray source RX J0019.8+2156 (hereafter, RX J0019) with a 12.2 mag optical counterpart was discovered by ROSAT. The source is a binary with the period of 0.66 days and its X-ray luminosity is fairly constant, at least, for 7 yrs. Therefore RX J0019 seems to be a typical luminous supersoft X-ray source (SSS) with steady hydrogen shell-burning on a mass-accreting white dwarf (WD).

Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 233
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004