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A New ZZ Ceti White Dwarf Pulsator: G30-20

Mukadam, Anjum S.; Kepler, S. O.; Winget, D. E.; Bergeron, P. (2002-11)

We report the discovery of a new hydrogen atmosphere variable white dwarf (DAV; ZZ Ceti), G30-20, a high-amplitude, long-period pulsator. The Fourier transform of its light curve shows power around 1050-1125 s. We suspect ...

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

Brown, Warren R.; Beers, Timothy C.; Wilhelm, Ronald; Prieto, Carlos Allende; Geller, Margaret J.; Kenyon, Scott J.; Kurtz, Michael J. (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

Young, Chadwick H.; Jorgensen, Jes K.; Shirley, Yancy L.; Kauffmann, Jens; Huard, Tracy; Lai, Shih-Ping; Lee, Chang Won; Crapsi, Antonio; Bourke, Tyler L.; Dullemond, Cornelis P.; Brooke, Timothy Y.; Porras, Alicia; Spiesman, William; Allen, Lori E.; Blake, Geoffrey A.; Evans, Neal J., II; Harvey, Paul M.; Koerner, David W.; Mundy, Lee G.; Myers, Philip C.; Padgett, Deborah L.; Sargent, Anneila I.; Stapelfeldt, Karl R.; van Dishoeck, Ewine F.; Bertoldi, Frank; Chapman, Nicholas; Cieza, Lucas; DeVries, Christopher H.; Ridge, Naomi A.; Wahhaj, Zahed (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 ...

Could The Ultra-Metal-Poor Stars Be Chemically Peculiar And Not Related To The First Stars?

Venn, Kim A.; Lambert, David L. (2008-04)

Chemically peculiar stars define a class of stars that show unusual elemental abundances due to stellar photospheric effects and not due to natal variations. In this paper, we compare the elemental abundance patterns of ...