225 citations · 930 across the 13 of their papers we have counts for
13 papers
Emission-line stars in M31 from the SPLASH and PHAT surveys
Laura J. Prichard, Puragra Guhathakurta, Katherine M. Hamren +7
We present a sample of 224 stars that emit H (H stars) in the Andromeda galaxy (M31). The stars were selected from 5000 spectra, collected as part of the Spectroscopic…
Carbon Stars in the Satellites and Halo of M31
Katherine Hamren, Rachael L. Beaton, Puragra GuhaThakurta +7
We spectroscopically identify a sample of carbon stars in the satellites and halo of M31 using moderate-resolution optical spectroscopy from the Spectroscopic and Photometric Lands…
Panchromatic Hubble Andromeda Treasury XII. Mapping Stellar Metallicity Distributions in M31
Dylan Gregersen, Anil C. Seth, Benjamin F. Williams +14
We present a study of spatial variations in the metallicity of old red giant branch stars in the Andromeda galaxy. Photometric metallicity estimates are derived by interpolating is…
A Spectroscopic and Photometric Exploration of the C/M Ratio in the Disk of M31
Katherine M. Hamren, Constance M. Rockosi, Puragra Guhathakurta +12
We explore the ratio (C/M) of carbon-rich to oxygen-rich thermally pulsing asymptotic giant branch(TP-AGB) stars in the disk of M31 using a combination of moderate-resolution optic…
A clear age-velocity dispersion correlation in Andromeda's stellar disk
Claire E. Dorman, Puragra Guhathakurta, Anil C. Seth +9
The stellar kinematics of galactic disks are key to constraining disk formation and evolution processes. In this paper, for the first time, we measure the stellar age-velocity disp…
TriAnd and its Siblings: Satellites of Satellites in the Milky Way Halo
A. J. Deason, V. Belokurov, K. M. Hamren +7
We explore the Triangulum-Andromeda (TriAnd) overdensity in the SPLASH (Spectroscopic and Photometric Landscape of Andromeda's Stellar Halo) and SEGUE (the Sloan Extension for Gala…
Characterizing the Cool KOIs. VI. H- and K-band Spectra of Kepler M Dwarf Planet-Candidate Hosts
Philip S. Muirhead, Juliette Becker, Gregory A. Feiden +12
We present H- and K-band spectra for late-type Kepler Objects of Interest (the "Cool KOIs"): low-mass stars with transiting-planet candidates discovered by NASA's Kepler Mission th…
The Pattern of CN, O, and Na Inhomogeneities on the Red Giant Branch of Messier 5
Graeme H. Smith, Payal N. Modi, Katherine M. Hamren
Data from the literature are used to explore the relation between 3883 CN band strength and the sodium and oxygen abundances of red giants in the globular cluster Messier 5. Alt…
HST/WFC3 Observations of Low-Mass Globular Clusters AM 4 and Palomar 13: Physical Properties and Implications for Mass Loss
Katherine M. Hamren, Graeme H. Smith, Puragra GuhaThakurta +4
We investigate the loss of low-mass stars in two of the faintest globular clusters known, AM 4 and Palomar 13 (Pal 13), using HST/WFC3 F606W and F814W photometry. To determine the…
Characterizing the Cool KOIs III. KOI-961: A Small Star with Large Proper Motion and Three Small Planets
Philip S. Muirhead, John Asher Johnson, Kevin Apps +21
We present the characterization of the star KOI 961, an M dwarf with transit signals indicative of three short-period exoplanets, originally discovered by the Kepler Mission. We pr…
Characterizing the Cool KOIs II. The M Dwarf KOI-254 and its Hot Jupiter
John Asher Johnson, J. Zachary Gazak, Kevin Apps +12
We report the confirmation and characterization of a transiting gas giant planet orbiting the M dwarf KOI-254 every 2.455239 days, which was originally discovered by the Kepler mis…
Characterizing the Cool Kepler Objects of Interest. New Effective Temperatures, Metallicities, Masses and Radii of Low-Mass Kepler Planet-Candidate Host Stars
Philip S. Muirhead, Katherine Hamren, Everett Schlawin +3
We report stellar parameters for late-K and M-type planet-candidate host stars announced by the Kepler Mission. We obtained medium-resolution, K-band spectra of 84 cool (Teff < 440…
Precise Stellar Radial Velocities of an M Dwarf with a Michelson Interferometer and a Medium-resolution Near-infrared Spectrograph
Philip S. Muirhead, Jerry Edelstein, David J. Erskine +13
Precise near-infrared radial velocimetry enables efficient detection and transit verification of low-mass extrasolar planets orbiting M dwarf hosts, which are faint for visible-wav…