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The HST large programme on Centauri -- V. Exploring the Ultracool Dwarf Population with Stellar Atmosphere and Evolutionary Modelling
Roman Gerasimov, Adam J. Burgasser, Derek Homeier +5
Brown dwarfs can serve as both clocks and chemical tracers of the evolutionary history of the Milky Way due to their continuous cooling and high sensitivity of spectra to compositi…
A Deep Search for Faint Chandra X-ray Sources, Radio Sources, and Optical Counterparts in NGC 6752
Haldan N. Cohn, Phyllis M. Lugger, Yue Zhao +6
We report the results of a deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in the nearby, core-collapsed globular cluster, NGC 6752. We combine…
A Comprehensive Astrometric Calibration of HST's WFPC2. I. Distortion Mapping
Dana I. Casetti-Dinescu, Terrence M. Girard, Vera Kozhurina-Platais +3
Wide field planetary camera 2 (WFPC2) exposures are already some 20 years older than Gaia epoch observations, or future JWST observations. As such, they offer an unprecedented time…
Radial Velocity Monitoring of the Young Star Hubble 4: Disentangling Starspot Lifetimes from Orbital Motion
Adolfo Carvalho, Christopher M. Johns-Krull, L. Prato +1
We studied the weak-lined T Tauri star Hubble 4, a known long-period binary, and its starspot phenomena. We used optical radial velocity (RV) data taken over a span of 14 years (20…