Spectroscopy of F supergiants with infrared excess

Details Spectroscopy of F supergiants with infrared excess Spectroscopy of F supergiants with infrared excess

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.272..710k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 272, Issue 4, pp. 710-716.

Astronomy and Astrophysics

Astronomy

66

Stars: Abundances, Stars: Agb And Post-Agb, Stars: Atmospheres, Stars: Individual: Iras 07134+1005, Stars: Individual: Iras 18095+2704

Scientific paper

Atmospheric parameters, abundances of 26 chemical elements and radial velocities, all based on CCD echelle spectra, are presented for two peculiar F supergiants with a large infrared excess: IRAS 07134+1005 and IRAS 18095+2704. A moderate underabundance of metallicity is revealed for both stars, [Fe/H]_=-1.0 and -0.78 dex, respectively. The significant overabundance of CNO elements is confirmed for IRAS 07134+0115: [C/Fe]=1.08 dex, [N/Fe]=1.03 dex and [O/Fe]=0.6 dex. For IRAS 18095+2704 these overabundances are less marked: [X/Fe]~=0.5 dex,but they are real. Large excesses of lanthanides are derived for both stars. Significant unexplained non-LTE effects occur, revealed by differences for many metals in the abundances obtained from neutral and ionized atomic lines. All of the characteristics of the IRAS sources studied are consistent with the hypothesis that they are at a post-AGB evolutionary stage.

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