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The Multiple Pre-main-sequence System PR Ori and the Associated HH 305 Flow
Bally, J.; Raga, A. C.; Geballe, T. R. +6 more
A detailed imaging and spectroscopic analysis is presented of the little-studied T Tauri star PR Ori and its associated Herbig-Haro flow HH 305, located on the outskirts of the L1641-N cluster in Orion. PR Ori is shown to be a multiple system, where the A component is a close 0.″077 binary, and the B component, at a distance of 3.″50, is the drive…
VLBA Observations of Strong Anisotripic Radio Scattering Toward the Orion Nebula
Kounkel, Marina; Rodríguez, Luis F.; Loinard, Laurent +6 more
We present observations of VLBA 20, a radio source found toward the edge of the Orion Nebula Cluster (ONC). Nonthermal emission dominates the spectral energy distribution of this object from the radio to mid-infrared regime, suggesting that VLBA 20 is extragalactic. This source is heavily scattered in the radio regime. Very Long Baseline Array obs…
The Berlin Exoplanet Search Telescope. II. Catalog of Variable Stars. III. Census of Variable Stars in a Puppis Field
Erikson, A.; Rauer, H.; Csizmadia, Sz. +5 more
The Berlin Exoplanet Search Telescope II (BEST II) is a ground-based, small aperture, wide-angle telescope used to search for stellar light variations in the southern hemisphere. We report the results of a monitoring campaign observing a field in the Puppis constellation in late 2011/early 2012. Light curves were obtained for 130,472 stars, out of…
Separated Fringe Packet Observations with the CHARA Array. III. The Very High-eccentricity Binary HR 7345
Farrington, C. D.; Schaefer, G. H.; ten Brummelaar, T. A. +1 more
After an 11-year observing campaign, we present the combined visual-spectroscopic orbit of the formerly unremarkable bright star HR 7345 (HD 181655, HIP 94981, GJ 754.2). Using the Separated Fringe Packet method with the CHARA Array, we were able to determine a difficult-to-complete orbital period of 331.609 ± 0.004 days. The 11-month period cause…