Hostname: page-component-848d4c4894-xm8r8 Total loading time: 0 Render date: 2024-06-19T19:42:44.190Z Has data issue: false hasContentIssue false

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

Menzies, J.W., Whitelock, P.A. 1988 MNRAS, 233, 697 Google Scholar
Rao, N.K., Goswami, A., Lambert, D.L. 2002 MNRAS, 310, 717 Google Scholar
Trammell, S.R., Dinerstein, H.L., Goodrich, R.W. 1994 AJ, 108, 984 Google Scholar
Tull, R.G., MacQueen, P.J., Sneden, C., Lambert, D.L. 1995 PASP, 107, 251 CrossRefGoogle Scholar