Results 81 to 90 of about 1,299,527 (231)

First grids of low-mass stellar models and isochrones with self-consistent treatment of rotation [PDF]

Astronomy & Astrophysics, 2019
Aims.We present an extended grid of state-of-the art stellar models for low-mass stars including updated physics (nuclear reaction rates, surface boundary condition, mass-loss rate, angular momentum transport, rotation-induced mixing, and torque ...
L. Amard, A. Palacios, C. Charbonnel, F. Gallet, C. Georgy, Nadège Lagarde, L. Siess   +6 more
semanticscholar   +1 more source

Quiet Please: Detrending Radial Velocity Variations from Stellar Activity with a Physically Motivated Spot Model

The Astronomical Journal
For solar-type stars, spots and their associated magnetic regions induce radial velocity perturbations through the Doppler rotation signal and the suppression of convective blueshift, collectively known as rotation modulation.
Jared C. Siegel, Samuel Halverson, Jacob K. Luhn, Lily L. Zhao, Khaled Al Moulla, Paul Robertson, Chad F. Bender, Ryan C. Terrien, Arpita Roy, Suvrath Mahadevan, Fred Hearty, Joe P. Ninan, Jason T. Wright, Eric B. Ford, Christian Schwab, Guðmundur Stefánsson, Cullen H. Blake, Michael W. McElwain   +17 more
doaj   +1 more source

A study of stellar population of intermediate-age globular cluster NGC 2249

Results in Physics, 2020
The Large Magellanic Cloud (LMC) star cluster NGC 2249 has been found to exhibit an extended main-sequence turn-off (eMSTO) in the color-magnitude diagram (CMD) derived from the data of the Hubble Space Telescope (HST).
Zhongmu Li, Rainer Spurzem, Caiyan Mao, Yingxin Ma, Yangyang Deng   +4 more
doaj  

Stellar ages and stellar rotation

, 2016
Stellar ages will play a big role in the next generation of astronomy. Useful to exoplaneteers and galactic archaeologists alike, this relatively under-exploited stellar property is currently limited by the precision of dating techniques. The work presented in this thesis contributes incrementally to a greater understanding of rotation period decay in ...
openaire   +2 more sources

Effect of stellar rotation on oscillation frequencies [PDF]

Astrophysics and Space Science, 2010
We investigate whether the rotational splittings of β Cephei stars can give some clue about the existence of a differential rotation in latitude, and if they are contaminated by the cubic order effects of rotation on oscillation frequencies. We also study some properties of splitting asymmetries and axisymmetric mode frequencies which provide seismic ...
Ouazzani, Rhita-Maria, Goupil, Marie-José, Dupret, Marc-Antoine, Reese, Daniel   +3 more
openaire   +3 more sources

A SYSTEMATIC STUDY OF EFFECTS OF STELLAR ROTATION, AGE SPREAD, AND BINARIES ON COLOR–MAGNITUDE DIAGRAMS WITH EXTENDED MAIN-SEQUENCE TURNOFFS [PDF]

, 2016
Stellar rotation, age spread, and binary stars are thought to be the three most possible causes of the peculiar color–magnitude diagrams (CMDs) of some star clusters, which exhibit extended main-sequence turnoffs (eMSTOs).
Zhongmu Li, C. Mao, Li-yun Zhang, Xi Zhang, Li Chen   +4 more
semanticscholar   +1 more source

Refining the Stellar Parameters of τ Ceti: a Pole-on Solar Analog

The Astronomical Journal, 2023
To accurately characterize the planets a star may be hosting, stellar parameters must first be well determined. τ Ceti is a nearby solar analog and often a target for exoplanet searches.
Maria Korolik, Rachael M. Roettenbacher, Debra A. Fischer, Stephen R. Kane, Jean M. Perkins, John D. Monnier, Claire L. Davies, Stefan Kraus, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Tyler Gardner, Cyprien Lanthermann, Gail H. Schaefer, Benjamin Setterholm, John M. Brewer, Joe Llama, Lily L. Zhao, Andrew E. Szymkowiak, Gregory W. Henry   +18 more
doaj   +1 more source

Effects of Stellar Rotation in Parker's Hydrodynamic Stellar Wind Model: How Protostars and Strong Rotators Lose their Angular Momentum Fast [PDF]

arXiv, 2016
The effects of the stellar rotation and the consequent azimuthal stellar wind flow in Parker's [9] hydrodynamic stellar wind model are discussed. Of special interest is the emergence of a whole new hydrodynamic physics via a new critical point in the stellar wind flow, which supersedes the critical point in Parker's [9] hydrodynamic model.
arxiv  

Investigating stellar surface rotation using observations of starspots [PDF]

, 2011
Rapid rotation enhances the dynamo operating in stars, and thus also introducessignificantly stronger magnetic activity than is seen in slower rotators. Many young cool stars still have the rapid, primordial rotation rates induced by the interstellar molecular cloud from which they were formed.
arxiv   +1 more source

Observational studies of stellar rotation [PDF]

EAS Publications Series, 2013
This course reviews the rotational properties of non-degenerate stars as observed from the protostellar stage to the end of the main sequence. It includes an introduction to the various observational techniques used to measure stellar rotation. Angular momentum evolution models developed over the mass range from the substellar domain to high-mass stars
openaire   +4 more sources