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28 papers · 2 filters
Multiwavelength Characteristics of Period-Luminosity Relations
Barry F. Madore, Wendy L. Freedman
We present a physically motivated explanation for the observed, monotonic increase in slope, and the simultaneous (and also monotonic) decrease in the width/scatter of the Leavitt…
The r-Process in Metal Poor Stars and Black Hole Formation
Richard Boyd, Michael Famiano, Bradley Meyer +3
Nucleosynthesis of heavy nuclei in metal-poor stars is generally thought to occur via the r-process because the r-process is a primary process that would have operated early in the…
The Chemical Compositions of Variable Field Horizontal Branch Stars: RR Lyrae Stars
Bi-Qing For, Christopher Sneden, George W. Preston
We present a detailed abundance study of 11 RR Lyrae ab-type variables: AS Vir, BS Aps, CD Vel, DT Hya, RV Oct, TY Gru, UV Oct, V1645 Sgr, WY Ant, XZ Aps, and Z Mic.High resolution…
A Spectroscopic Survey & Analysis of Bright, Hydrogen-Rich White Dwarfs
Alexandros Gianninas, Pierre Bergeron, Maria Teresa Ruiz
We have conducted a spectroscopic survey of over 1300 bright (V < 17.5), hydrogen-rich white dwarfs based largely on the last published version of the McCook & Sion catalog. The co…
Distance Scale Zero-Points from Galactic RR Lyrae Star Parallaxes
G. Fritz Benedict, Barbara E. McArthur, Michael W. Feast +15
We present new absolute trigonometric parallaxes and proper motions for seven Pop II variable stars: five RR Lyr variables; RZ Cep, XZ Cyg, SU Dra, RR Lyr, UV Oct; and two type 2 C…
The Araucaria Project. Accurate determination of the dynamical mass of the classical Cepheid in the eclipsing system OGLE-LMC-CEP-1812
G. Pietrzynski, I. Thompson, D. Graczyk. +8
We have analyzed the double-lined eclipsing binary system OGLE-LMC-CEP-1812 in the LMC and demonstrate that it contains a classical fundamental mode Cepheid pulsating with a period…