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The Starburst Cluster Westerlund 1: The Initial Mass Function and Mass Segregation
Beomdu Lim, Moo-Young Chun, Hwankyung Sung +5
Westerlund 1 is the most important starburst cluster in the Galaxy due to its massive star content. We have performed BVIc and JKs photometry to investigate the initial mass functi…
The Initial Mass Function and the Surface Density Profile of NGC 6231
Hwankyung Sung, Hugues Sana, M. S. Bessell
We have performed new wide-field photometry of the young open cluster NGC 6231 to study the shape of the initial mass function (IMF) and mass segregation. We also investigated the…
The Most Metal-Poor Stars. IV. The Two Populations With [Fe/H] < -3.0
John E. Norris, David Yong, M. S. Bessell +8
We discuss the carbon-normal and carbon-rich populations of Galactic halo stars having [Fe/H] < -3.0, utilizing chemical abundances from high-resolution, high-S/N model-atmosphere…
A High-Resolution Spectroscopic Search for the Remaining Donor for Tycho's Supernova
Wolfgang E. Kerzendorf, David Yong, Brian P. Schmidt +12
In this paper, we report on our analysis using Hubble Space Telescope astrometry and Keck-I HIRES spectroscopy of the central six stars of Tycho's supernova remnant (SN 1572). With…
Identifying Nearby, Young, Late-type Stars by Means of Their Circumstellar Disks
Adam Schneider, Inseok Song, Carl Melis +2
It has recently been shown that a significant fraction of late-type members of nearby, very young associations (age <10 Myr) display excess emission at mid-IR wavelengths indicativ…
Deep search for companions to probable young brown dwarfs
G. Chauvin, J. Faherty, A. Boccaletti +10
We have obtained high contrast images of four nearby, faint, and very low mass objects 2MASSJ04351455-1414468, SDSSJ044337.61+000205.1, 2MASSJ06085283-2753583 and 2MASSJ06524851-57…