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29 March 2024
 
  » arxiv » astro-ph/0203411

 Article overview


High-resolution spectroscopy of QY Sge -- An obscured RV Tauri variable?
N. Kameswara Rao ; Aruna Goswami ; David L. Lambert ;
Date 22 Mar 2002
Subject astro-ph
AffiliationIndian Institute of Astrophysics, Bangalore, India), Aruna Goswami (Indian Institute of Astrophysics, Bangalore, India), David L. Lambert (Department of Astronomy, University of Texas at Austin, USA
AbstractThe first high-resolution optical spectra of QY Sge are presented and discussed. Menzies & Whitelock (1988) on the basis of photometry and low-resolution spectra suggested that this G0I supergiant was obscured by dust and seen only by scattered light from a circumstellar reflection nebula. The new spectra confirm and extend this picture. Photospheric lines are unusually broad indicating scattering of photons from dust in the stellar wind. Presence of very broad Na D emission lines is confirmed. Sharp emission lines from low levels of abundant neutral metal atoms are reported for the first time. An abundance analysis of photospheric lines shows that the stellar atmosphere is of approximately solar composition but with highly condensible (e.g., Sc and Ti) elements depleted by factors of 5 to 10.
Source arXiv, astro-ph/0203411
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