Kalirai, Jason S., Beaton, Rachael L., Geha, Marla C., Gilbert, Karoline M., Guhathakurta, Puragra, Kirby, Evan N., ...
We present new Keck/DEIMOS spectroscopic observations of hundreds of individual stars along the sightline to Andromeda's first three discovered dwarf spheroidal galaxies (dSphs) - And I, II, and III,...
The Splash Survey: A Spectroscopic Portrait of Andromeda's Giant Southern Stream (2009)
Gilbert, Karoline M., Guhathakurta, Puragra, Kollipara, Priya, Beaton, Rachael L., Geha, Marla C., Kalirai, Jason S., ...
The giant southern stream (GSS) is the most prominent tidal debris feature in M31's stellar halo and covers a significant fraction of its southern quadrant. The GSS is a complex structure composed of...
Star clusters as laboratories for stellar and dynamical evolution (2009)
Kalirai, Jason S., Richer, Harvey B.
Open and globular star clusters have served as benchmarks for the study of stellar evolution due to their supposed nature as simple stellar populations of the same age and metallicity. After a brief...
The SPLASH Survey: A Spectroscopic Portrait of Andromeda's Giant Southern Stream (2009)
Gilbert, Karoline M., Guhathakurta, Puragra, Kollipara, Priya, Beaton, Rachael L., Geha, Marla C., Kalirai, Jason S., ...
The giant southern stream (GSS) is the most prominent tidal debris feature in M31's stellar halo. The GSS is composed of a relatively metal-rich, high surface-brightness "core" and a lower...
Kalirai, Jason S., Zucker, Daniel B., Guhathakurta, Puragra, Geha, Marla, Kniazev, Alexei Y., Martinez-Delgado, David, ...
Andromeda X (And X) is a newly discovered low-luminosity M31 dwarf spheroidal galaxy (dSph) found by Zucker et al. (2007) in the Sloan Digital Sky Survey (SDSS - York et al. 2000). In this paper, we...
The Masses of Population II White Dwarfs (2009)
Kalirai, Jason S., Davis, D. Saul, Richer, Harvey B., Bergeron, P., Catelan, Marcio, Hansen, Brad M. S., ...
Globular star clusters are among the first stellar populations to have formed in the Milky Way, and thus only a small sliver of their initial spectrum of stellar types are still burning hydrogen on...
The Spectral Types of White Dwarfs in Messier 4 (2009)
Davis, D. Saul, Richer, Harvey B., Rich, R. Michael, Reitzel, David R., Kalirai, Jason S.
We present the spectra of 24 white dwarfs in the direction of the globular cluster Messier 4 obtained with the Keck/LRIS and Gemini/GMOS spectrographs. Determining the spectral types of the stars in...
Deep Optical Photometry of Six Fields in the Andromeda Galaxy (2009)
Brown, Thomas M., Smith, Ed, Ferguson, Henry C., Guhathakurta, Puragra, Kalirai, Jason S., Kimble, Randy A., ...
Using the Advanced Camera for Surveys on the Hubble Space Telescope, we have obtained deep optical images reaching well below the oldest main sequence turnoff in six fields of the Andromeda Galaxy....
Deep ACS Imaging in the Globular Cluster NGC6397: Dynamical Models (2008)
Hurley, Jarrod R., Shara, Michael M., Richer, Harvey B., King, Ivan R., Davis, D. Saul, Kalirai, Jason S., ...
We present N-body models to complement deep imaging of the metal-poor core-collapsed cluster NGC6397 obtained with the Hubble Space Telescope. All simulations include stellar and binary evolution...