Model Atmosphere Analyses of Ultraviolet Spectra of Novae in Outburst

Details Model Atmosphere Analyses of Ultraviolet Spectra of Novae in Outburst Model Atmosphere Analyses of Ultraviolet Spectra of Novae in Outburst

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996asu..reptr....s&link_type=abstract

Technical Report, Arizona State Univ. Tempe, AZ United States Dept. of Physics.

Astronomy and Astrophysics

Astrophysics

Atmospheric Models, Supernovae, Radiative Transfer, Stellar Spectrophotometry, Stellar Spectra, Linear Transformations, Ultraviolet Spectra, Radio Bursts, Stellar Atmospheres, Astrophysics, Water Vapor, Metallicity, Space Plasmas, Photosphere, M Stars, Dwarf Stars, Quasars

Scientific paper

We discuss the physical effects that are important for the formation of the early spectra of novae. Nova atmospheres are optically thick, fast expanding shells with flat density profiles, leading to geometrically very extended atmospheres. We show that the properties of early nova spectra can be understood in terms of this basic model and discuss some important effects that influence the structure and the emitted spectrum of nova atmospheres, e.g., line blanketing, NLTE effects, and the velocity field. The proper modeling of nova atmospheres is discussed and we give some computational details. We also discuss the following: our implementation of an extremely detailed model atom of singly ionized iron for NLTE computations in static and moving astrophysical plasmas; the evolution of the bright nova Cas 1993 over the first two months after its discovery, and the possibility of a radiatively driven wind ejection from it; remarks about nova spectroscopy and photometry including the use of synthetic spectra calculations in determining nova characteristics from the photospheric observations; model atmospheres for M (sub)dwarf stars; comparisons between observed and synthetic spectra for water vapor transitions in a range of M dwarfs; a new low-resolution (R approximately 250) 1.0-2.4 micron spectra for 13 red dwarfs; new evolutionary calculations for low-mass and very low-mass M-dwarfs, for a metallicity range -2 less than or equal to (M/H) less than or equal to 0, down to the hydrogen-burning minimum mass; the convergence properties and computational speed of the accelerated Lambda-iteration for the solution of a variety of radiative transfer problems; NLTE effects on the strength of the Lyman edge in Quasar accretion disks; NLTE model atmospheres of M dwarfs and Giants; NLTE synthetic spectra for the Type Ia supernovae SN 1992A, SN 1981B, and SN 1991bg near maximum light; the effects of Fe II NLTE on nova atmospheres and spectra; and radiative transfer in the co-moving frame.

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