Bradford W. Greeley and William P. Blair
Department of Physics and Astronomy
The Johns Hopkins University
Charles and 34th Streets
Baltimore, Maryland 21218
E-mail: greeley@pha.jhu.edu
and
Knox S. Long
Space Telescope Science Institute
3700 San Martin Drive
Baltimore, MD 21218
and the
Lyman limit for the first time.
The Nova Cir 1995 observation exhibits many broad carbon, nitrogen,
and oxygen emission lines thoughout the HUT wavelength range. We
approximate its extinction, and fit absorption by the
Lyman and Werner bands of molecular hydrogen to
find an H
column density of
log N(H
) = 20.7 cm
. We calculate electron temperatures
and abundances in the nova shell. The abundances are substantially non-solar,
with nitrogen enhanced relative to carbon by a factor of 2, and oxygen
deficient by a factor of 9 relative to carbon.
The broad asymmetric line profiles in the Nova Aql 1995 spectrum show
that this nova has not evolved as quickly
as Nova Cir 1995 .
The Nova Aql 1995 spectrum is significantly reddened, with little flux detected
below Ly
. A series of three spectra taken over 10 days shows dramatic
changes in the ultraviolet line strengths and profiles as the shell
evolves.
Subject headings: novae -- stars: individual (Nova Cir 1995, Nova Aql 1995)