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The chemical composition and circumstellar environment of the variable star QY Sge

Published online by Cambridge University Press:  12 April 2016

Aruna Goswami
Affiliation:
Indian Institute of Astrophysics, Bangalore 560034, India CREST, Indian Institute of Astrophysics, Hosakote 562114, India
N. Kameswara Rao
Affiliation:
Indian Institute of Astrophysics, Bangalore 560034, India
D.L. Lambert
Affiliation:
Department of Astronomy, University of Texas, Austin, TX 78712-1083, USA

Abstract

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Chemical composition studies of the variable star QY Sge show abundance anomalies suggestive of the pattern exhibited by the warmer RV Tau variables. Abundance analysis indicates a near-solar atmosphere with highly condensable elements depleted by several factors. Evidence of broad Na D emission features in its spectrum, a characteristic feature of R CrB stars taken at minimum, however, raises the question of its spectral classification. We address this question through a comparative analysis of its spectrum with those of γ Cyg 89 Her and R CrB taken at minimum, in addition to abundance analysis. We also discuss a possible physical scenario of the circumstellar environment accounting for the characteristics of the distinct spectroscopic features.

Type
Part 7. Chemical composition of variable stars
Copyright
Copyright © Astronomical Society of the Pacific 2004

References

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