Open AccessHigh‐resolution spectroscopy of QY Sge: an obscured RV Tauri variable?
Author(s) -
Kameswara Rao N.,
Goswami Aruna,
Lambert David L.
Publication year - 2002
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2002.05502.x
Subject(s) - physics , astrophysics , supergiant , spectral line , astronomy , photometry (optics) , t tauri star , emission spectrum , spectroscopy , stellar atmosphere , circumstellar dust , astronomical spectroscopy , stars
The first high‐resolution optical spectra of QY Sge are presented and discussed. Menzies & Whitelock, 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. The 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 condensable (e.g. Sc and Ti) elements depleted by factors of 5–10 .