Status of Line identifications in the ChandraLETG Spectrum of Procyon

摘要

We report on our ongoing efforts to produce a relatively complete set of X-ray emission lines present in the Low Energy Transmission Grating (LETG) spectra ofProcyon. In addition to using recently reprocessed HRC-S/LETG spectra of Procyon,we use LETG spectra of Capella, along with recent Electron Bean Ion Trap (EBIT)laboratory data and new Flexible Atomic Code (FAC) calculations to identify thewealth of weaker lines present in the spectrum. Experimental measurements at theEBIT-I and EBIT-II facilities at Livermore of astrophysically abundant elements (FeVII-Fe X, Lepson et al. 2002, Ar IX- Ar XVI, Lepson et al 2003, S VII- S XIV,Lepson et al 2004) and new FAC calculations of Mg and Ne (Gu, 2008 in press)provide an opportunity to identify many of the previously unassigned lines in Procyon(Raassen et al, 2002).