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[12.04] The Chandra LETG Spectrum of Lambda Andromedae

N. S. Brickhouse, A. K. Dupree, R. Hoogerwerf (Harvard-Smithsonian Center for Astrophysics)

We report early results from the Chandra LETG observation of Lambda Andromedae. Lambda Andromedae (HR 8961, HD 222107) is an RS CVn binary system (d =26 pc) consisting of a G8 IV-III and a spectroscopically undetected secondary. Since the primary dominates the emission, the photospheric abundances are relatively well known, and thus the system makes an ideal candidate for studying coronal-to-photospheric abundance patterns. A Chandra LETG spectrum was obtained in July 2002 with an exposure time of 98.6 ks. The spectrum contains emission lines from many elements and ionic species. We use a line-based analysis to determine the relative abundance ratio between Ne and Fe, and discuss the implications for understanding coronal abundance anomalies.

This work is supported in part by NASA grant GO2-3017X to the Smithsonian Astrophysical Observatory. N. S. Brickhouse acknowledges the support of the Chandra X-ray Observatory Center (NAS8-39073).

Bulletin of the American Astronomical Society, 35#2
© 2003. The American Astronomical Soceity.