[Previous] | [Session 45] | [Next]
K. Lyons, D. Stys, R. Slevinsky, E.M. Sion (Villanova U.)
We have analyzed HST archival and IUE NEWSIPS archival SWP spectra of the dwarf novae CM Del and AH Her obtained when AAVSO light curve data indicated the occurence of dwarf nova quiescence. We have computed synthetic, high gravity spectra in LTE with solar composition using TLUSTY195 and SYNSPEC42 and carried out fits of these models to the far UV continuum and narrow absorption line spectra. The results of our synthetic spectral analyses of the archival IUE spectra of AH Her are presented. For CM Del, we find that the far UV spectrum is dominated by a hot (Teff = 24,000K, log g = 7) white dwarf with subsolar silicon abundance and all other observed metal transitions at essentially their solar values. Synthetic profile fits to the HST medium resolution G160M spectra of the Si IV (1393, 1402) resonance doublet yield a white dwarf rotational velocity V sin i = 500± 50 km/s. This value is discussed in the context of angular momentum transfer and rotation rates for other CV degenerates. This work is supported by NASA ADP grant NAG5-8388, HST Archival grant AR08013.01-96A and by NSF grant AST99-01195 to Villanova University.