Search Publications
A Search for Extra-tidal RR Lyrae in Globular Clusters NGC 5024 and NGC 5053
Riddle, Reed; Rusholme, Ben; Kaplan, David L. +9 more
Recently, Kundu et al. reported that the globular cluster NGC 5024 (M53) possesses five extra-tidal RR Lyrae. In fact, four of them were instead known members of a nearby globular cluster NGC 5053. The status of the remaining extra-tidal RR Lyrae is controversial depending on the adopted tidal radius of NGC 5024. We have also searched for addition…
BD+14°3061: A Luminous Yellow Post-AGB Star in the Galactic Halo
Bond, Howard E.
I report the discovery that the ninth-mag Galactic-halo star BD+14°3061 is a member of the rare class of luminous metal-poor "yellow post-AGB" stars. Its Gaia DR2 parallax implies an absolute magnitude of MV = -3.44 ± 0.27, and it is a very high-velocity star moving in a retrograde Galactic orbit. BD+14°3061 is a field analog of the hal…
Census of the Young Stellar Population in the Galactic H II Region Sh2-242
Joshi, Santosh; Dutta, Somnath; Mondal, Soumen +3 more
We present here identification and characterization of the young stellar population associated with an active star-forming site Sh2-242. We used our own new optical imaging and spectroscopic observational data, as well as several archival catalogs, e.g., Pan-STARRS 1, Gaia DR2, IPHAS, Wide-field InfraRed Camera, 2MASS, and Spitzer. Slit spectrosco…
Orbital Refinement and Stellar Properties for the HD 9446, HD 43691, and HD 179079 Planetary Systems
Henry, Gregory W.; Kane, Stephen R.; Pepper, Joshua +15 more
The Transit Ephemeris Refinement and Monitoring Survey is a project that aims to detect transits of intermediate-long period planets by refining orbital parameters of the known radial velocity planets using additional data from ground-based telescopes, calculating a revised transit ephemeris for the planet, then monitoring the planet host star dur…
Open Cluster IC 1369 and Its Vicinity: Multicolor Photometry and Gaia DR2 Astrometry
Straižys, V.; Raudeliūnas, S.; Maskoliūnas, M. +9 more
The open cluster IC 1369, located in Cygnus close to the galactic equator at the 89°6 longitude, and its vicinity are investigated by applying two-dimensional photometric classification of stars down to V = 19 mag measured in the Vilnius seven-color photometric system. Employing the Gaia DR2 coordinates, parallaxes, and proper motions, 143 cluster…
Emission-line Data Cubes of the HH 32 Stellar Jet
Hartigan, Patrick; Neill, James D.; Hillenbrand, Lynne A. +5 more
We analyze data cubes of over 60 emission lines in the HH 32 stellar jet acquired with the Keck Cosmic Web Imager (KCWI). The data cover the less explored blue portion of the spectrum between 3586 and 6351 Å and have both high spectral (R ∼ 10,000) and spatial (≲1″) resolution. The study includes all three major ionization states of oxygen, three …
A KELT-TESS Eclipsing Binary in a Young Triple System Associated with the Local "Stellar String" Theia 301
Cunningham, Joni-Marie C.; Feliz, Dax L.; Dixon, Don M. +10 more
HD 54236 is a nearby, wide common-proper-motion visual pair that has been previously identified as likely being very young by virtue of strong X-ray emission and lithium absorption. Here, we report the discovery that the brighter member of the wide pair, HD 54236A, is itself an eclipsing binary (EB), comprising two near-equal solar-mass stars on a…
HD 165054: An Astrometric Calibration Field for High-contrast Imagers in Baade's Window
Duchêne, Gaspard; Esposito, Thomas M.; Hom, Justin +51 more
We present a study of the HD 165054 astrometric calibration field that has been periodically observed with the Gemini Planet Imager (GPI). HD 165054 is a bright star within Baade's Window, a region of the galactic plane with relatively low extinction from interstellar dust. HD 165054 was selected as a calibrator target due to the high number densi…
Chandra Resolves the Double FU Orionis System RNO 1B/1C in X-Rays
Skinner, Stephen L.; Güdel, Manuel
We present new Chandra X-ray observations of the close pair of young stars RNO 1B and 1C (6″ separation) located in the L1287 cloud. RNO 1B erupted in 1978-1990 and is classified as an FU Orionis star (FUor). RNO 1C also shows most of the properties of an FUor but no eruption has been seen yet. Only a few dozen FUors are known and the presence of …
Exoplanets in the Antarctic Sky. IV. Dual-band Photometry of Variables Found by the CSTAR-II Commissioning Survey at the North Sky
Wittenmyer, Robert A.; Wang, Lifan; Yang, Ming +30 more
From the experiences learned in three decades of exoplanet search, wide-field transit surveys have proven to be one of the most effective ways to detect exoplanets. Wide field of view, however, suffers from high false-positive rates caused by blended eclipsing binaries. The chromaticity in eclipse depth is an effective feature to distinguish low-d…