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Effect of Compact Objects Near Be Stars

Published online by Cambridge University Press:  23 September 2016

Krishna M.V. Apparao  and
S.P. Tarafdar
Krishna M.V. Apparao
Affiliation:
Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400005, India

Extract

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Several Be stars are identified with bright X-ray sources. (Rappaport and Van den Heuvel, 1982). The bright X-ray emission and observed periodicities indicate the existence of compact objects (white dwarfs, neutron stars or black holes) near the Be stars. A prime example is the brightest X-ray source A0538-66 in LMC, which contains a neutron star with a rotation period of 59 ms. Apparao (1985) explained the X-ray emission, which occurs in periodic flares, by considering an inclined eccentric orbit for the neutron star around the assumed Be-star. The neutron star when it enters a gas ring (around the Be-star) accreting matter giving out X-rays.

The X-ray emission from the compact objects, when the gas ring from the Be-star envelopes the objects, has interesting consequences. The X-ray emission produces an ionized region (compact object Stromgren sphere or COSS) in the gas surrounding the compact object (CO).

Type
V. Evolutionary Status of Be Stars
Information
International Astronomical Union Colloquium , Volume 92: Physics of Be Stars , August 1987 , pp. 516 - 518
Copyright
Copyright © Cambridge University Press 1987

References

Apparao, K.M.V., Ap.J. 287, 338.CrossRefGoogle Scholar
Apparao, K.M.V. and Tarafdar, S.P., 1986, Astron. Astrophys., 155, 423.Google Scholar
Apparao, K.M.V. and Tarafdar, S.P., 1986b, Astron. Astrophys. (in press)Google Scholar
Rappaport, S. A. and Van den Heuvel, E. P. J., 1982, I.A.U. Symp. No. 98, D.Reidel Publishing Co., Holland Google Scholar