Search Publications
Precise Distance Measurement for a Near-Earth Asteroid by the Refined Rotational Reflex Velocity Method
Lin, F. R.; Peng, Q. Y.; Guo, B. F. +1 more
The rotational reflex velocity (RRV) method was proposed by Heinze and Metchev in 2015 and was used to measure the distances of main-belt asteroids (MBAs). Later, Lin et al. generalized this method using spherical astronomy in 2016. The method measures the distances of MBAs using the observations from a single ground-based telescope over two night…
PCAT-DE: Reconstructing Pointlike and Diffuse Signals in Astronomical Images Using Spatial and Spectral Information
Daylan, Tansu; Zemcov, Michael; Sayers, Jack +5 more
Observational data from astronomical imaging surveys contain information about a variety of source populations and environments, and their complexity will increase substantially as telescopes become more sensitive. Even for existing observations, measuring the correlations between pointlike and diffuse emission can be crucial to correctly inferrin…
A Search for Gas-Rich Dwarf Galaxies in the Local Universe with ALFALFA and the WIYN One Degree Imager
Cannon, John M.; Salzer, John J.; Haynes, Martha P. +5 more
We present results from an optical search for Local Group dwarf galaxy candidates associated with the Ultra-Compact High Velocity Clouds (UCHVCs) discovered by the ALFALFA neutral hydrogen survey. The ALFALFA UCHVCs are isolated, compact H I clouds with projected sizes, velocities, and estimated H I masses that suggest they may be nearby dwarf gal…
X-Ray and UV Observations of the Contact Binary KIC 9832227
Pandel, Dirk; Molnar, Lawrence A.
We investigate the X-ray and UV emission from the contact binary star KIC 9832227, which was observed with XMM-Newton for one orbital cycle. The binary is detected with an average X-ray luminosity of 3.4 × 1030 erg s-1. The X-ray emission is restricted to energies below 3 keV and originates from a multitemperature plasma with…
Mass Ratio of Single-line Spectroscopic Binaries with Visual Orbits Using Bayesian Inference and Suitable Priors
Vanzi, Leonardo; Anguita-Aguero, Jennifer; Mendez, Rene A. +4 more
We present orbital elements for 22 single-line binaries, nine of them studied for the first time, determined from a joint spectroscopic and astrometric solution. The astrometry is based on interferometric measurements obtained with the HRCam Speckle camera on the SOAR 4.1 m telescope at Cerro Pachon, Chile, supplemented with historical data. The s…
Chemical Compositions Of Red Giant Stars in the Old Open Cluster NGC 7789
Pilachowski, Catherine A.; Afşar, Melike; Sneden, Christopher +1 more
We have gathered optical-region spectra, derived model atmosphere parameters, and computed elemental abundances for 15 red giant stars in the open cluster NGC 7789. We focus on the light element group CNOLi that provides clues to evolutionary changes associated with internal fusion events and chemical mixing. We confirm and extend an early report …
Two Warm Super-Earths Transiting the Nearby M Dwarf TOI-2095
Kostov, Veselin B.; Powell, Brian P.; Barclay, Thomas +56 more
We report the detection and validation of two planets orbiting TOI-2095 (TIC 235678745). The host star is a 3700 K M1V dwarf with a high proper motion. The star lies at a distance of 42 pc in a sparsely populated portion of the sky and is bright in the infrared (K = 9). With data from 24 sectors of observation during Cycles 2 and 4 of the Transiti…
Timescale of Stellar Feedback-driven Turbulence in the ISM: A Deep Dive into UGC 4305
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Cohen, Roger E. +3 more
Understanding the interplay of stellar feedback and turbulence in the interstellar medium (ISM) is essential to modeling the evolution of galaxies. To determine the timescales over which stellar feedback drives turbulence in the ISM, we performed a spatially resolved, multiwavelength study of the nearby star-forming dwarf galaxy UGC 4305. As indic…
TU Tau B: The Peculiar "Eclipse" of a Possible Proto-barium Giant
Walker, Gary; Gray, Richard O.; Corbally, Christopher J. +26 more
TU Tau (=HD 38218 = HIP 27135) is a binary system consisting of a C-N carbon star primary and an A-type secondary. We report on new photometry and spectroscopy which tracked the recent disappearance of the A-star secondary. The dimming of the A star was gradual and irregular, with one or more brief brightenings, implying the presence of nonhomogen…
Catalog of Integrated-light Star Cluster Light Curves in TESS
Davenport, James R. A.; Pepper, Joshua; Fetherolf, Tara +10 more
We present the first integrated-light, TESS-based light curves for star clusters in the Milky Way, Small Magellanic Cloud, and Large Magellanic Cloud. We explore the information encoded in these light curves, with particular emphasis on variability. We describe our publicly available package elk, which is designed to extract the light curves by ap…