Results 31 to 40 of about 214,380 (335)

Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis

The Astronomical Journal, 2023
The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M _⊕ and a 15.5 day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 days and surface differential rotation very similar to the Sun.
Travis S. Metcalfe, Derek Buzasi, Daniel Huber, Marc H. Pinsonneault, Jennifer L. van Saders, Thomas R. Ayres, Sarbani Basu, Jeremy J. Drake, Ricky Egeland, Oleg Kochukhov, Pascal Petit, Steven H. Saar, Victor See, Keivan G. Stassun, Yaguang Li, Timothy R. Bedding, Sylvain N. Breton, Adam J. Finley, Rafael A. García, Hans Kjeldsen, Martin B. Nielsen, J. M. Joel Ong, Jakob L. Rørsted, Amalie Stokholm, Mark L. Winther, Catherine A. Clark, Diego Godoy-Rivera, Ilya V. Ilyin, Klaus G. Strassmeier, Sandra V. Jeffers, Stephen C. Marsden, Aline A. Vidotto, Sallie Baliunas, Willie Soon   +33 more
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Chaotic Dynamics of Stellar Spin in Binaries and the Production of Misaligned Hot Jupiters

EPJ Web of Conferences, 2015
Motivated by observed hot Jupiter systems with high stellar obliquities, we examine the dynamics of stellar spin in planetary systems with distant stellar companions, with inclinations sufficiently high so that the planet undergoes Kozai-Lidov ...
Anderson Kassandra R., Storch Natalia I., Lai Dong   +2 more
doaj   +1 more source

Semi-analytical Expression of G-mode Period Spacing: The Case of Brunt–Väisälä Frequency with Not a Jump but a Ramp

The Astrophysical Journal, 2023
To decipher complex patterns of gravity-mode period spacings observed for intermediate-mass main-sequence stars is an important step toward a better understanding of the structure and dynamics in the deep radiative region of the stars.
Yoshiki Hatta
doaj   +1 more source

Wind anisotropy and stellar evolution [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractMass loss is a determinant factor which strongly affects the evolution and the fate of massive stars. At low metallicity, stars are supposed to rotate faster than at the solar one. This favors the existence of stars near the critical velocity. In this rotation regime, the deformation of the stellar surface becomes important, and wind anisotropy
Georgy, Cyril, Meynet, Georges, Maeder, André   +2 more
openaire   +5 more sources

3D Radiation-hydrodynamic Simulations Resolving Interior of Rapidly Accreting Primordial Protostar

The Astrophysical Journal, 2023
Direct collapse of supermassive stars is a possible pathway to form supermassive black hole seeds at high redshifts. Whereas previous three-dimensional (3D) simulations demonstrate that supermassive stars form via rapid mass accretion, those resolving ...
Kazutaka Kimura, Takashi Hosokawa, Kazuyuki Sugimura, Hajime Fukushima   +3 more
doaj   +1 more source

The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies

, 2009
The stellar masses, mean ages, metallicities, and star formation histories of galaxies are now commonly estimated via stellar population synthesis (SPS) techniques.
Abazajian, Adelman-McCarthy, Atlee, Baraffe, Bell, Bell, Bertelli, Bessell, Blanton, Blanton, Blanton, Brown, Brown, Brown, Bruzual, Bundy, Bundy, Charlie Conroy, Charlot, Charlot, Cool, Daddi, Daddi, Dotter, Drory, Duquennoy, Eisenstein, Elmegreen, Ferraro, Fioc, Girardi, Hao, Hopkins, James E. Gunn, Jarrett, Jarrett, Kalirai, Kannappan, Kriek, Lada, Lee, Lee, Lee, Lee, Li, Lin, Lucatello, Maller, Maraston, Maraston, Maraston, Martin White, Masjedi, McCrea, Pagel, Panter, Papovich, Piotto, Preston, Renzini, Rich, Sarajedini, Scalo, Scalo, Schaller, Schiavon, Shapley, Strauss, Thomas, Tinsley, Tumlinson, Tumlinson, van Dokkum, van Dokkum, Vazdekis, Worthey, Xin, Yi, Yi, Yi, York   +80 more
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Planetary Engulfment Prognosis within the ρ CrB System

The Astrophysical Journal, 2023
Exoplanets have been detected around stars at various stages of their lives, ranging from young stars emerging from formation to the latter stages of evolution, including white dwarfs and neutron stars.
Stephen R. Kane
doaj   +1 more source

Pulsation Period Change & Classical Cepheids: Probing the Details of Stellar Evolution

, 2014
Measurements of secular period change probe real-time stellar evolution of classical Cepheids making these measurements powerful constraints for stellar evolution models, especially when coupled with interferometric measurements. In this work, we present
Bisol, Alexandra C., Engle, Scott, Guinan, Ed, Neilson, Hilding R.   +3 more
core   +1 more source

Monte Carlo Simulations of Globular Cluster Evolution. V. Binary Stellar Evolution

, 2009
We study the dynamical evolution of globular clusters containing primordial binaries, including full single and binary stellar evolution using our Monte Carlo cluster evolution code updated with an adaptation of the single and binary stellar evolution ...
Ashman, Binney, Chatterjee, Dalessandro, Davis, Demleitner, Duquennoy, Frederic A. Rasio, Fregeau, Fregeau, Fregeau, Fregeau, Hansen, Heggie, Hurley, Hwang, John M. Fregeau, Joshi, Joshi, Kroupa, Lombardi, Merritt, Noyola, Scheepmaker, Sills, Sills, Sourav Chatterjee, Spitzer, Stefan Umbreit, Trenti, Trenti   +30 more
core   +1 more source

Theoretical Predictions of Surface Light Element Abundances in Protostellar and Pre-Main Sequence Phase

Frontiers in Astronomy and Space Sciences, 2021
Theoretical prediction of surface stellar abundances of light elements–lithium, beryllium, and boron–represents one of the most interesting open problems in astrophysics.
E. Tognelli, E. Tognelli, S. Degl’Innocenti, S. Degl’Innocenti, P. G. Prada Moroni, P. G. Prada Moroni, L. Lamia, L. Lamia, L. Lamia, R. G. Pizzone, A. Tumino, A. Tumino, C. Spitaleri, C. Spitaleri, A. Chiavassa   +14 more
doaj   +1 more source