Results 11 to 20 of about 1,000,727 (374)
Rotational Shearing Interferometer in Detection of the Super-Earth Exoplanets
Applied Sciences, 2022 The astronomers and the general population are fascinated with the problem of exoplanet detection. By far the largest number of detected planets are the so-called Super Earths, relatively cold planets orbiting a large, red giant star, with diameters up ...
Marija Strojnik
doaj +1 more source
The Astrophysical Journal, 2015 The internal rotation of post-main sequence stars is investigated, in response to the convective pumping of angular momentum toward the stellar core, combined with a tight magnetic coupling between core and envelope. The spin evolution is calculated using model stars of initial mass 1, 1.5 and $5\,M_\odot$, taking into account mass loss on the giant ...
Yevgeni Kissin, Christopher Thompson
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Search for a Black Hole Binary in Gaia DR3 Astrometric Binary Stars with Spectroscopic Data
The Astrophysical Journal, 2023 We report the discovery of a candidate binary system consisting of a black hole (BH) and a red giant branch star in Gaia DR3. This binary system was discovered from 64,108 binary solutions for which both astrometric and spectroscopic data are available ...
Ataru Tanikawa +5 more
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Superflares on Giant Stars [PDF]
Astronomy Reports, 2018 7 pages, 3 figures, 1 table.
Katsova, M.M. +4 more
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A noninteracting low-mass black hole–giant star binary system [PDF]
Science, 2018 A black hole hiding in a binary star As material falls toward a black hole, it heats up and emits x-rays. Almost all black holes are discovered by this x-ray emission. Thompson et al.
T. Thompson +16 more
semanticscholar +1 more source
Two Jovian Planets around the Giant Star HD 202696: A Growing Population of Packed Massive Planetary Pairs around Massive Stars? [PDF]
Astronomical Journal, 2019 We present evidence for a new two-planet system around the giant star HD 202696 (=HIP 105056, BD +26 4118). The discovery is based on public HIRES radial velocity (RV) measurements taken at Keck Observatory between 2007 July and 2014 September.
T. Trifonov +8 more
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Precise Age for the Binary Star System 12 Com in the Coma Berenices Cluster
The Astronomical Journal, 2023 We present measurements of the interferometrically resolved binary star system 12 Com and the single giant star 31 Com in the cluster Coma Berenices. 12 Com is a double-lined spectroscopic binary system consisting of a G7 giant and an A3 dwarf at the ...
Rex Lam +13 more
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The Rotational Shear Layer inside the Early Red-giant Star KIC 4448777 [PDF]
Astrophysical Journal, 2018 We present the asteroseismic study of the early red-giant star KIC 4448777, complementing and integrating a previous work, aimed at characterizing the dynamics of its interior by analyzing the overall set of data collected by the Kepler satellite during ...
M. D. Di Mauro +3 more
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TU Tau B: The Peculiar “Eclipse” of a Possible Proto-barium Giant
The Astronomical Journal, 2023 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.
Richard O. Gray +28 more
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A Companion Star Launching Jets in the Wind Acceleration Zone of a Giant Star [PDF]
Astrophysical Journal, 2019 By conducting three-dimensional hydrodynamical simulations we find that jets that a main-sequence companion launches as it orbits inside the wind acceleration zone of an asymptotic giant branch star can efficiently remove mass from that zone.
S. Hillel, R. Schreier, N. Soker
semanticscholar +1 more source