Silicon Hydride in Blue Spectra of Cool Stars and Globular Clusters

Details Silicon Hydride in Blue Spectra of Cool Stars and Globular Clusters Silicon Hydride in Blue Spectra of Cool Stars and Globular Clusters

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.1410p&link_type=abstract

American Astronomical Society Meeting 208, #14.10; Bulletin of the American Astronomical Society, Vol. 38, p.94

Astronomy and Astrophysics

Astrophysics

Scientific paper

We demonstrate that lines of the silicon hydride molecule SiH make a significant contribution to the total line absorption in blue spectra of many cool, metal-poor stars and globular clusters. Individual SiH lines are identified for the first time in the high-quality Hinkle et al. spectrum of Arcturus, the nearby metal-poor K giant, and are seen in other cool stars with alpha-abundance enhancements. In such cases, their strength and number over 4100A - 4160A is sufficient to increase absorption in the broad-band Lick indexes of the CN molecule, which is then alpha-sensitive.This work is supported by grants from NASA/STScI Hubble Treasury Program GO-9455/9974/10094 and NASA Long-Term Space Astrophysics Program contract NAS5-02052.

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