Observations of hydrogen deficient binary Upsilon sagittarii |
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Authors: | N Kameswara Rao V R Venugopal |
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Affiliation: | (1) Indian Institute of Astrophysics, 560034 Bangalore;(2) Radio Astronomy Centre, Tata Institute of Fundamental Research, Post Box 8, 643001 Udhagamandalam |
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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.
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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Keywords: | stars chemically peculiar stars individual stars eclipsing ultraviolet astronomy mass loss |
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