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White Dwarf Luminosity And Mass Functions From Sloan Digital Sky Survey Spectra
(2008-01)
We present the first phase in our ongoing work to use Sloan Digital Sky Survey (SDSS) data to create separate white dwarf (WD) luminosity functions (LFs) for two or more different mass ranges. In this paper, we determine ...
The Century Survey Galactic Halo Project. III. A Complete 4300 Deg(2) Survey Of Blue Horizontal Branch Stars In The Metal-Weak Thick Disk And Inner Halo
(2008-02)
We present a complete spectroscopic survey of 2414 2MASS-selected blue horizontal branch ( BHB) candidates selected over 4300 deg(2) of the sky. We identify 655 BHB stars in this non-kinematically selected sample. We ...
A "Starless'' Core That Isn't: Detection of A Source in the L1014 Dense Core With the Spitzer Space Telescope
(2004-09)
We present observations of L1014, a dense core in the Cygnus region previously thought to be starless, but data from the Spitzer Space Telescope show the presence of an embedded source. We propose a model for this source ...
Carbon In Red Giants In Globular Clusters And Dwarf Spheroidal Galaxies
(2015-03)
We present carbon abundances of red giants in Milky Way (MW) globular clusters and dwarf spheroidal galaxies (dSphs). Our sample includes measurements of carbon abundances for 154 giants in the clusters NGC 2419, M68, and ...
Simulations Of Accretion Powered Supernovae In The Progenitors Of Gamma-Ray Bursts
(2012-05)
Observational evidence suggests a link between long-duration gamma-ray bursts (LGRBs) and Type Ic supernovae. Here, we propose a potential mechanism for Type Ic supernovae in LGRB progenitors powered solely by accretion ...
The Mid-Infrared Extinction Law In The Ophiuchus, Perseus, And Serpens Molecular Clouds
(2009-01)
We compute the mid-IR extinction law from 3.6 to 24 mu m in three molecular clouds-Ophiuchus, Perseus, and Serpens-by combining data from the "Cores to Disks" Spitzer Legacy Science program with deep JHK(s) imaging. Using ...
The Vega Debris Disc: A View From Herschel
(2010)
We present five band imaging of the Vega debris disc obtained using the Herschel Space Observatory. These data span a wavelength range of 70-500 mu m with full-width half-maximum angular resolutions of 5.6-36.9 ''. The ...
The Dust Cloud Around The White Dwarf G 29-38. II. Spectrum From 5 To 40 Mu M And Mid-Infrared Photometric Variability
(2009-03)
We model the mineralogy and distribution of dust around the white dwarf G29-39 using the infrared spectrum from 1 to 35 mu m. The spectral model for G29-38 dust combines a wide range of materials based on spectral studies ...
A Young-Planet Search in Visible and Infrared Light: Dn Tauri, V836 Tauri, and V827 Tauri
(2008-11)
In searches for low-mass companions to late-type stars, correlation between radial velocity variations and line bisector slope changes indicates contamination by large starspots. Two young stars demonstrate that this test ...
Center-To-Limb Variation Of Solar Three-Dimensional Hydrodynamical Simulations
(2008-06)
We examine closely the solar center-to-limb variation of continua and lines and compare observations with predictions from both a three-dimensional (3D) hydrodynamic simulation of the solar surface ( provided by M. Asplund ...