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Blue stragglers, HB and turnoff stars in 4 GC
We present a spectroscopic analysis of HST STIS and FOS low- and intermediate-resolution spectroscopy of 55 stars in four globular clusters (47 Tucanae, M3, NGC 6752, and NGC... -
Abundance Analyses of RV Tauri Variables
Analyses of the photospheric compositions of the four field RV Tauri stars, EP Lyr, DY Ori, AR Pup, and R Sge, indicate that to varying degrees they have experienced... -
DECam observations of NGC 2808
Wide-field and deep DECam multiband photometry, combined with HST data for the core of the Galactic globular cluster NGC2808, allowed us to study the distribution of various... -
Identifying multiple populations in M71 using CN
We have observed their cyanogen CN features at ~3800 and 4120{AA} as well as the CH band at ~4300{AA} for 145 evolved stars in the Galactic globular cluster M71 using the... -
RGB & HB members of the bulge cluster NGC 6569
Photometric and spectroscopic analyses have shown that the Galactic bulge cluster Terzan 5 hosts several populations with different metallicities and ages that manifest as a... -
A spectroscopic survey of field RHB stars
A metallicity, chemical composition, and kinematic survey has been conducted for a sample of 340 candidate field red horizontal-branch (RHB) stars. Spectra with high resolution... -
Kinematics of horizontal-branch stars from SDDSS-DR7
On the basis of a recently derived color-metallicity relation and stellar parameters from the Sloan Digital Sky Survey Data Release 7 spectroscopic survey, a large sample of red... -
New samples of BHB stars in the Milky Way
We study the Milky Way region (|Z|<3.0kpc) where the thick disk and inner halo overlap by using the kinematics of local blue horizontal branch (BHB) stars (within 1kpc) and... -
Photometry and spectroscopy of BHB candidates
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... -
Equivalent width of 33 metal-poor RHB
We have conducted spectrum analyses of 24 field metal-poor ([Fe/H]<-2) red horizontal-branch (RHB) stars identified in the HK objective-prism survey and 6 such stars in the... -
BHB stars in Century Survey Galactic Halo Project
We discuss a 175{deg}2 spectroscopic survey for blue horizontal branch (BHB) stars in the Galactic halo. We use the Two Micron All Sky Survey (2MASS, ) and the Sloan Digital Sky... -
Blue HB stars in SDSS
We isolate samples of 733 bright (g<18) and 437 faint (g>18) high Galactic latitude blue horizontal-branch stars with photometry and spectroscopy in the Sloan Digital Sky... -
2MASS photometry of hot subdwarf stars
Utilizing the Two Micron All Sky Survey (2MASS) Second Incremental Data Release Catalog, we have retrieved near-IR magnitudes for several hundred hot subdwarfs (sdO and sdB... -
Caby photometry of {Omega} Centauri
We present new measurements of the metallicity of 131 RR Lyrae stars in the globular cluster {omega} Centauri, using the hk index of the Caby photometric system. The hk method... -
Spectroscopy of hot stars in the halo. III
We present results from an analysis of medium-resolution spectroscopy and UBV photometry for a sample of 1121 A-type stars in the halo (and disk) of the Galaxy. A previously... -
Spectroscopy of hot stars in the halo
We discuss a spectroscopic and photometric technique that enables the identification and classification of field horizontal-branch (FHB) and other A-type stars, even from... -
VI photometry of NGC 6426
A color-magnitude diagram of the globular cluster NGC 6426 has been constructed from photometry in the V and I passbands. The cluster has the steep giant branch indicative of a... -
Abundances in RR Lyr variables
We have used moderately high-resolution, high S/N spectra to study the chemical composition of ten field ab-type RR Lyrae stars. Variables having accurate photometric and... -
Blue horizontal branch stars
A complete sample of blue horizontal branch (BHB) stars in the magnitude range 13.0<V<16.5 is isolated in two Galactic fields that have previously been searched for RR... -
Blue horizontal branch stars catalog
(no description available) Cone search capability for table J/A+AS/109/171/table1 (F117 field (l = 270deg, b = -45deg)) Cone search capability for table J/A+AS/109/171/table2...