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Precise Photometric Measurements from a 1903 Photographic Plate Using a Commercial Scanner
Cerny, William; Kron, Richard G.; Martinez, Michael N. +9 more
We demonstrate the feasibility of determining magnitudes of stars on archival photographic plates using a commercially available scanner. We describe one photometric approach that could serve as a useful example for other studies. In particular, we measure and calibrate stellar magnitudes from a 1903 photographic plate from the Yerkes Observatory …
The orbits of Triton and Nereid and the pole orientation of Neptune from Voyager, Hubble Space Telescope, and Earth-based astrometry in 1847-2020
Fu, Yanning; Yuan, Ye; Chen, Jian +1 more
Context. New observations and new planetary and satellite ephemerides provide opportunities to improve the ephemerides for Triton and Nereid as well as relevant parameters. In particular, the observations include a lot of new accurate Earth-based positions reduced with Gaia astrometic catalogs and accurate positions obtained from Hubble Space Tele…
Confirming known planetary trends using a photometrically selected Kepler sample
Lin, Jane; Casagrande, Luca; Ireland, Michael J. +1 more
Statistical studies of exoplanets and the properties of their host stars have been critical to informing models of planet formation. Numerous trends have arisen in particular from the rich Kepler data set, including that exoplanets are more likely to be found around stars with a high metallicity and the presence of a 'gap' in the distribution of p…
Foreshock cavitons and spontaneous hot flow anomalies: a statistical study with a global hybrid-Vlasov simulation
Blanco-Cano, Xóchitl; Alho, Markku; Johlander, Andreas +10 more
The foreshock located upstream of Earth's bow shock hosts a wide variety of phenomena related to the reflection of solar wind particles from the bow shock and the subsequent formation of ultra-low-frequency (ULF) waves. In this work, we investigate foreshock cavitons, which are transient structures resulting from the non-linear evolution of ULF wa…
An infrared study of Galactic OH/IR stars - III. Variability properties of the Arecibo sample
García-Lario, P.; Engels, D.; Jiménez-Esteban, F. M. +2 more
We present the results of a near-infrared (NIR) monitoring programme carried out between 1999 and 2005 to determine the variability properties of the 'Arecibo sample of OH/IR stars'. The sample consists of 385 IRAS-selected Asymptotic Giant Branch (AGB) candidates, for which their O-rich chemistry has been proven by the detection of 1612 MHz OH ma…
A Search for TeV Gamma-Ray Emission from Pulsar Tails by VERITAS
Kargaltsev, Oleg; Klingler, Noel; Benbow, W. +55 more
We report on the search for very-high-energy gamma-ray emission from the regions around three nearby supersonic pulsars (PSR B0355+54, PSR J0357+3205, and PSR J1740+1000) that exhibit long X-ray tails. To date there is no clear detection of TeV emission from any pulsar tail that is prominent in X-ray or radio. We provide upper limits on the TeV fl…
HD 183579b: a warm sub-Neptune transiting a solar twin detected by TESS
Torres, Guillermo; Barclay, Thomas; Hellier, Coel +48 more
We report the discovery and characterization of a transiting warm sub-Neptune planet around the nearby bright (V = 8.75 mag, K = 7.15 mag) solar twin HD 183579, delivered by the Transiting Exoplanet Survey Satellite (TESS). The host star is located 56.8 ± 0.1 pc away with a radius of R* = 0.97 ± 0.02 R⊙ and a mass of M*<…
Variability of Disk Emission in Pre-main Sequence and Related Stars. V. Occultation Events from the Innermost Disk Region of the Herbig Ae Star HD 163296
Bayyari, Ammar; Sitko, Michael L.; Grady, Carol A. +8 more
HD 163296 is a Herbig Ae star that underwent a dramatic ~0.8 magnitude drop in brightness in the V photometric band in 2001 and a brightening in the near-IR in 2002. Because the star possesses Herbig-Haro objects traveling in outflowing bipolar jets, it was suggested that the drop in brightness was due to a clump of dust entrained in a disk wind, …
The contribution by luminous blue variable stars to the dust content of the Magellanic Clouds
Asmus, D.; Mehner, A.; de Wit, W. -J. +6 more
Context. Previous studies have concluded that low- and intermediate-mass stars cannot account for the interstellar dust yield in the Magellanic Clouds inferred from far-infrared and sub-millimetre observations.
Aims: Luminous blue variable stars (LBVs) form dust as a result of episodic, violent mass loss. To investigate their contribution as …
Dynamical modelling of CXOGBS J175553.2-281633: a 10 h long orbital period cataclysmic variable
Strader, Jay; Maccarone, Thomas J.; Jonker, Peter G. +8 more
We present modelling of the long-term optical light and radial velocity curves of the binary stellar system CXOGBS J175553.2-281633, first detected in X-rays in the Chandra Galactic Bulge Survey. We analysed 7 yr of optical I-band photometry from Optical Gravitational Lensing Experiment and found long-term variations from year to year. These long-…