120 citations · 946 across the 56 of their papers we have counts for
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The Initial-Final Mass Relation among White Dwarfs in Wide Binaries
Jingkun Zhao, Terry D. Oswalt, Lee Anne Willson +2
We present the initial-final mass relation derived from 10 white dwarfs in wide binaries that consist of a main sequence star and a white dwarf. The temperature and gravity of each…
Fragile Binary Candidates in the SDSS DR8 spectroscopic archive
Jingkun Zhao, Terry D. Oswalt, Gang Zhao
We present a catalog of 80 very wide fragile binary candidates (projected separations > 10000 AU) from the SDSS DR8 spectral archive. The pairs were selected based on proper motion…
Metallicity and Kinematic distributions of Red Horizontal-Branch Stars from the SDSS Survey
Y. Q. Chen, G. Zhao, J. K. Zhao +2
On the basis of a recently derived color-metallicity relation and stellar parameters from the Sloan Digtal Sky Survey Data Release 7 spectroscopic survey, a large sample of red hor…
The Metallicity Gradient of the Thick Disk Based on Red Horizontal Branch Stars From SDSS DR8
Y. Q. Chen, G. Zhao, K. Carrell +1
Based on SDSS DR8, we have selected a sample of 1728 red horizontal branch stars with |Z|<3 kpc by using a color-metallicity relation and stellar parameters. The sample stars clear…
Metallicity calibration for solar type stars based on red spectra
J. K. Zhao, G. Zhao, Y. Q. Chen +1
Based on high resolution and high signal-to-noise ratio (S/N) spectra analysis of 90 solar type stars, we have established several new metallicity calibrations in Teff range [5600,…
The Chromospheric Activity, Age, Metallicty and Space Motions of 36 Wide Binaries
J. K. Zhao, T. D. Oswalt, M. Rudkin +2
We present the chromospheric activity (CA) levels, metallicities and full space motions for 41 F, G, K and M dwarf stars in 36 wide binary systems. Thirty-one of the binaries, cont…