Silicon abundance in Population I giants

Details Silicon abundance in Population I giants Silicon abundance in Population I giants

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.2510b&link_type=abstract

The Astronomical Journal (ISSN 0004-6256), vol. 106, no. 6, p. 2510-2515

Astronomy and Astrophysics

Astronomy

2

Abundance, Carbon, Giant Stars, Main Sequence Stars, Silicon, Stellar Composition, Stellar Spectra, Correlation, Line Spectra, Mass Ratios

Scientific paper

Silion to carbon abundance ratios for Population I giants were determined from emission lines originating in the transition layers between stellar chromospheres and coronae. For effective temperatures larger than 6200 K we find a group of stars for which the silicon to carbon abundance ratio appears to be increased. These stars are presumably descendents from AP stars on Am stars with increased surface silicon to carbon abundance ratios. Around B-V approximately equal to 0.45 this anomaly disappears as is to be expected due to the increased depth of the convection zone and therefore deeper mixing which dilutes the surface overabundances. Unexplained is the apparent increased silicon to carbon abundance ratio observed for several stars cooler than 5100 K. RS CVn and related stars do not show this increased abundance ratio.

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