The Spectrum of the Cool R Coronae Borealis Variable S Apodis in a Deep Decline
Abstract
A high resolution spectrum (5575 - 8875\AA) of the cool R Coronae Borealis variable S Apodis in its 1993 deep decline is discussed. Narrow or chromospheric emission lines of Na I, K I, Ca II, and Ba II and broad emission lines of He I 7065\AA and Na I D are seen, as expected from published reports of warmer RCBs in decline. The surprise of the S Aps spectrum is the considerable blue shift of the broad emissions component to the Na D lines. The blue shift may result from lines formed in a bipolar flow which is obscured asymmetrically by soot clouds along the line of sight. (SECTION: Stars)
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- March 1997
- DOI:
- 10.1086/133884
- Bibcode:
- 1997PASP..109..270G
- Keywords:
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- STARS: VARIABLES: OTHER;
- STARS: EVOLUTION