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Observations of hydrogen deficient binary Upsilon sagittarii

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Abstract

The absolute magnitudeM v of the hydrogen deficient binary υ Sgr has been estimated as -4.8 ± 1.0 from the distribution of the interstellar reddening, polarization and interstellar lines of the surrounding stars. From the ANS observations obtained at the time of the secondary eclipse, it appears that the hotter secondary is surrounded by a disc with colours of a B8-B9 star. The λ 1550 CIv absorption line arising in the stellar wind does not show any change in strength during the secondary minimum. The upper limit to the mass-loss rate from the high temperature wind is estimated as ≤ 5 × 10-7 M⊙ yr-1 from the 2 cm and 6 cm radio observations.

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Authors and Affiliations

  1. Indian Institute of Astrophysics, 560034, Bangalore

    N. Kameswara Rao

  2. Radio Astronomy Centre, Tata Institute of Fundamental Research, Post Box 8, 643001, Udhagamandalam

    V. R. Venugopal

Authors
  1. N. Kameswara Rao
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  2. V. R. Venugopal
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Additional information

Based on observations obtained with the Astronomical Netherlands Satellite and VLA. The National Radio Astronomy Observatory’s Very Large Array at Socorro, New Mexico is operated by Associated Universities Inc. under contract with the National Science Foundation.

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Rao, N.K., Venugopal, V.R. Observations of hydrogen deficient binary Upsilon sagittarii. J. Astrophys. Astr. 6, 101–112 (1985). https://doi.org/10.1007/BF02715081

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  • DOI: https://doi.org/10.1007/BF02715081

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