Optical Spectroscopy of Peculiar Supergiants

Details Optical Spectroscopy of Peculiar Supergiants Optical Spectroscopy of Peculiar Supergiants

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001assl..265..265k&link_type=abstract

Post-AGB Objects as a Phase of Stellar Evolution, Proceedings of the Toruń Workshop held July 5-7, 2000. Edited by R. Szczerba a

Astronomy and Astrophysics

Astrophysics

4

Scientific paper

Based on optical echelle spectra we have determined the main parameters, the atmospheric chemical abundances and the evolutionary status of a sample of peculiar supergiants associated with infrared sources. In the spectra of some post--AGB objects we have revealed strong emission C2 Swan bands and absorption features at the positions of well--known DIBs. An analysis of radial--velocities and intensities led us to the conclusion that these spectral features originate predominantly in the expanding circumstellar envelopes.

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