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30 papers · 2 filters
Type Iax Supernovae: A New Class of Stellar Explosion
Ryan J. Foley, P. J. Challis, R. Chornock +19
We describe observed properties of the Type Iax class of supernovae (SNe Iax), consisting of SNe observationally similar to its prototypical member, SN 2002cx. The class currently…
Are There Any Stars Lacking Neutron-Capture Elements? Evidence from Strontium and Barium
Ian U. Roederer
The cosmic dispersion in the abundances of the heavy elements strontium and barium in halo stars is well known. Strontium and barium are detected in most cool, metal-poor giants, b…
NSV 11749: Symbiotic Nova, Not a Born-Again Red Giant
Howard E. Bond, Mansi M. Kasliwal
NSV 11749 is a little-studied variable star, discovered by W. J. Luyten, which had a long-duration outburst around the year 1903, reaching blue magnitude 12.5 at maximum. Following…
New Hubble Space Telescope Observations of Heavy Elements in Four Metal-Poor Stars
Ian U. Roederer, James E. Lawler, Jennifer S. Sobeck +7
Elements heavier than the iron group are found in nearly all halo stars. A substantial number of these elements, key to understanding neutron-capture nucleosynthesis mechanisms, ca…
Pulsation models for the 0.26M_sun star mimicking RR Lyrae pulsator. Model survey for the new class of variable stars
R. Smolec, G. Pietrzynski, D. Graczyk +11
We present non-linear hydrodynamic pulsation models for OGLE-BLG-RRLYR-02792 - a 0.26M_sun pulsator, component of the eclipsing binary system, analysed recently by Pietrzynski et a…
The binary fraction of planetary nebula central stars I. A high-precision, I-band excess search
Orsola De Marco, Jean-Claude Passy, D. J. Frew +2
In an attempt to determine how many planetary nebulae derive from binary interactions, we have started a project to measure their unbiased binary fraction. This number, when compar…