Enhanced noble gases in the coronae of active stars

We have analyzed Chandra High-Energy Transmission Grating spectra of the ac tive RS CVn-type binary V711 Tauri (HR 1099; HD 22468) in order to examine the chemical composition of its coronae. Observed fluxes and flux upper lim its for spectral lines from a range of charge states of iron, covering spec ies Fe XVI- Fe XXV, have been used to determine the emission measure distri bution as a function of temperature, while the observed Fe line-to-continuu m ratio has been used to examine the absolute iron abundance, Fe/H. Abundan ces of elements O, Ne, Mg, Si, S, and Ar relative to both Fe and H have bee n estimated by comparison of observed line fluxes with predictions based on the emission measure distribution. We confirm results of earlier studies f inding the coronae of V711 Tau to be metal-poor and derive an iron abundanc e of Fe/H = 7.0 +/- 0.1. We find the noble gas elements Ne and Ar to be enh anced relative to the local cosmic value and enhanced by an order of magnit ude relative to Fe. Very mild enhancements of O and Mg relative to Fe are a lso discerned. By examination of coronal abundances of Ne relative to Fe cu lled from the literature, in addition to Ne lines seen in hitherto unpublis hed Chandra spectra, we conclude that large Ne abundance enhancements are a common feature of active stellar coronae.