Results 1 to 10 of about 4,400 (313)
Red-giant stars in eccentric binaries [PDF]
EPJ Web of Conferences, 2015 The unparalleled photometric data obtained by NASA’s Kepler Space Telescope has led to improved understanding of red-giant stars and binary stars. We discuss the characterization of known eccentric system, containing a solar-like oscillating red-giant ...
Beck P. G. +6 more
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Asteroseismology of Solar-Type and Red-Giant Stars [PDF]
Annual Review of Astronomy and Astrophysics, 2013 We are entering a golden era for stellar physics driven by satellite and telescope observations of unprecedented quality and scope. New insights on stellar evolution and stellar interiors physics are being made possible by asteroseismology, the study of stars by the observation of natural, resonant oscillations.
William J. Chaplin, Andrea Miglio
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Kinematics of Tycho-2 red giant clump stars [PDF]
Astronomy Letters, 2009 Based on the Ogorodnikov-Milne model, we analyze the proper motions of 95 633 red giant clump (RGC) stars from the Tycho-2 Catalogue. The following Oort constants have been found: A = 15.9+-0.2 km/s/kpc and B = -12.0+-0.2 km/s/kpc. Using 3632 RGC stars with known proper motions, radial velocities, and photometric distances, we show that, apart from the
V. V. Bobylev +3 more
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Stellar loci IV. red giant stars [PDF]
Research in Astronomy and Astrophysics, 2021 Abstract In the fourth paper of this series, we present the metallicity-dependent Sloan Digital Sky Survey (SDSS) stellar color loci of red giant stars, using a spectroscopic sample of red giants in the SDSS Stripe 82 region. The stars span a range of 0.55 – 1.2 mag in color g – i, –0.3 – –2.5 in metallicity [Fe/H], and have values of ...
Zhang, Ruoyi +5 more
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Exoplanets around Red Giants: Distribution and Habitability
Galaxies, 2023 As the search for exoplanets continues, more are being discovered orbiting Red Giant stars. We use current data from the NASA Exoplanet Archive to investigate planet distribution around Red Giant stars and their presence in the host’s habitable zone.
Ruixuan E. Chen +4 more
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The Astrophysical Journal, 2023 This paper reports the estimated stellar parameters of 1153 Kepler red giant branch stars determined with asteroseismic modeling. We use radial-mode oscillation frequencies, gravity-mode period spacings, Gaia luminosities, and spectroscopic data to ...
Yingxiang Wang +4 more
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Red Giant Branch Stars: The Theoretical Framework [PDF]
Publications of the Astronomical Society of the Pacific, 2002 Theoretical predictions of Red Giant Branch stars' effective temperatures, colors, luminosities and surface chemical abundances are a necessary tool for the astrophysical interpretation of the visible--near infrared integrated light from unresolved stellar populations, the Color-Magnitude-Diagrams of resolved stellar clusters and galaxies, and ...
Salaris, M., Cassisi, S., Weiss, A.
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Investigating APOKASC Red Giant Stars with Abnormal Carbon-to-nitrogen Ratios
The Astrophysical Journal, 2023 The success of galactic archeology and the reconstruction of the formation history of our Galaxy relies critically on precise ages for large populations of stars. For evolved stars in the red clump and red giant branch, the carbon-to-nitrogen ratio ([C/N]
Erica Bufanda +4 more
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Irregular Red-Giant Variable Stars [PDF]
International Astronomical Union Colloquium, 1989 Aperiodic intrinsic variability becomes increasingly evident for a greater number of red giant and supergiant stars as observations become more technically refined and extended over a longer time. All red variables show an erratic temporal behavior to some degree.
M. Querci, F. Querci
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Why Stars Become Red Giants [PDF]
The Astrophysical Journal, 2000 The evolution of stars to red giants is revisited in order to promote a better understanding of the behavior of stars on the H-R diagram by separating the essential nonlinear characteristics of stellar structure from detailed effects of input physics such as chemical compositions, opacity, convection criterion, etc.
Daiichiro Sugimoto, Masayuki Y. Fujimoto
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