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18 papers · 2 filters
Type Ia Supernovae: Toward the Standard Model?
David Branch
In this short review I suggest that recent developments support the conjecture that Type Ia supernovae (SNe Ia) are the complete disruptions of Chandrasekhar-mass carbon-oxygen whi…
STIS Ultraviolet Spectral Evidence for Outflows in Extreme Narrow-Line Seyfert 1 Galaxies
Karen M. Leighly
(abridged) I present and discuss the results of HST STIS observations of IRAS 13224-3809 and 1H 0707-495, two narrow-line Seyfert 1 (NLS1) galaxies. We discovered that high-ionizat…
Model Independent Primordial Power Spectrum from Maxima, Boomerang, and DASI Data
Yun Wang, Grant J. Mathews
A model-independent determination of the primordial power spectrum of matter density fluctuations could uniquely probe physics of the very early universe, and provide powerful cons…
Distance-Redshift in Inhomogeneous Friedmann-Lemaitre-Robertson-Walker Cosmology
R. Kantowski, R. C. Thomas
Distance--redshift relations are given in terms of associated Legendre functions for partially filled beam observations inspatially flat Friedmann-Lemaitre-Robertson-Walker (FLRW)…
Analysis of the Type IIn Supernova 1998S: Effects of Circumstellar Interaction on Observed Spectra
Eric J. Lentz, E. Baron, Peter Lundqvist +20
We present spectral analysis of early observations of the Type IIn supernova 1998S using the general non-local thermodynamic equilibrium atmosphere code \tt PHOENIX}. We model both…
Preliminary Spectral Analysis of the Type II Supernova 1999em
E. Baron, David Branch, Peter H. Hauschildt +19
We have calculated fast direct spectral model fits to two early-time spectra of the Type-II plateau SN 1999em, using the SYNOW synthetic spectrum code. The first is an extremely ea…
Spectroscopically Peculiar Type Ia Supernovae and Implications for Progenitors
D. Branch
In a recent paper Li et al. (2000) reported that 36 percent of 45 Type Ia supernovae (SNe Ia) discovered since 1997 in two volume-limited supernova searches were spectroscopically…
Non-LTE Modeling of Nova Cygni 1992
C. I. Short, P. H. Hauschildt, S. Starrfield +1
We present a grid of nova models that have an extremely large number of species treated in non-LTE, and apply it to the analysis of an extensive time series of ultraviolet spectros…
On the Spectroscopic Diversity of Type Ia Supernovae
Kazuhito Hatano, David Branch, Eric J. Lentz +3
A comparison of the ratio of the depths of two absorption features in the spectra of TypeIa supernovae (SNe Ia) near the time of maximum brightness with the blueshift of the deep r…
The Age of the Galaxy from Thorium Cosmochronometry
C. Sneden, J. J. Cowan
The long-lived radioactive element thorium can potentially provide a simple and direct clock to determine the age of our Galaxy. Spectroscopic investigations of thorium in metal-po…
SN 1984A and Delayed Detonation Models of Type Ia Supernovae
Eric J. Lentz, E. Baron, David Branch +1
SN 1984A shows unusually large expansion velocities in lines from freshly synthesized material, relative to typical Type Ia Supernovae (SNe Ia). SN 1984A is an example of a group o…
Non-LTE treatment of molecules in the photospheres of cool stars
Andreas Schweitzer, Peter H. Hauschildt, E. Baron
We present a technique to treat systems with very many levels, like molecules, in non-LTE. This method is based on a superlevel formalism coupled with rate operator splitting. Supe…
Spectrum Analysis of the Type Ib Supernova 1999dn: Probable Identifications of C II and H-alpha
J. S. Deng, Y. L. Qiu, J. Y. Hu +2
Low resolution spectra of SN 1999dn at early times are presented and compared with synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW. We fi…
Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-Poor Giants
Debra L. Burris, Catherine A. Pilachowski, Taft E. Armandroff +3
New abundances for neutron-capture (n-capture) elements in a large sample of metal-poor giants from the Bond survey are presented. The spectra were acquired with the KPNO 4-m echel…
On The Cosmic Origins Of Carbon And Nitrogen
R. B. C. Henry, M. G. Edmunds, J. Koeppen
We analyze the behavior of N/O and C/O abundance ratios as a function of metallicity as gauged by O/H in large, extant Galactic and extragalactic H II region abundance samples. Num…
Evidence of Multiple r-Process Sites in the Early Galaxy: New Observations of CS 22892-052
Christopher Sneden, John J. Cowan, Inese I. Ivans +4
First results are reported of a new abundance study of neutron-capture elements in the ultra-metal-poor (UMP; [Fe/H] = -3.1) halo field giant star CS 22892-052. Using new high reso…
The Age-Redshift Relation for Standard Cosmology
R. C. Thomas, R. Kantowski
We present compact, analytic expressions for the age-redshift relation for standard Friedmann-Lema\^ \itre-Robertson-Walker (FLRW) cosmology. The new expressions are given i…
Distance-Redshift in Inhomogeneous FLRW
R. Kantowski, J. K. Kao, R. C. Thomas
We give distance--redshift relations in terms of elliptic integrals for three different mass distributions of the Friedmann-Lema\^ıtre-Robertson-Walker (FLRW) cosmology. These mode…