Results 61 to 70 of about 837,700 (191)

The effects of stellar winds on the magnetospheres and potential habitability of exoplanets [PDF]

, 2014
V.S. acknowledges the support of an STFC studentship. A.A.V. acknowledges support from a Royal Astronomical Society Fellowship and an Ambizione Fellowship from the Swiss National Science Foundation. S.V.J.
S. C. Marsden, Jeffers, Sandra V., P. Petit, S. V. Jeffers, Jardine, M., M. Jardine, A. A. Vidotto, Vidotto, A. A., Petit, P., V. See, Do Nascimento, J.D., J. D. do Nascimento, do Nascimento, Jose-Dias Jr., do Nascimento Jr., J. D., Jeffers, S.V., See, Wyke Chun Victor, Vidotto, A.A., Marsden, S. C., See, V., Jeffers, S. V., Marsden, S.C.   +20 more
core   +1 more source

StarFlow: Leveraging Normalizing Flows for Stellar Age Estimation in SDSS-V DR19

The Astronomical Journal
Understanding the ages of stars is crucial for unraveling the formation history and evolution of our Galaxy. Traditional methods for estimating stellar ages from spectroscopic data often struggle with providing appropriate uncertainty estimations and are
Alexander Stone-Martinez, Jon A. Holtzman, Yuxi(Lucy) Lu, Sten Hasselquist, Julie Imig, Emily J. Griffith, Earl P. Bellinger, Andrew K. Saydjari   +7 more
doaj   +1 more source

Stellar Ages and an Extended Theory of Gravitation [PDF]

Progress of Theoretical Physics, 1970
Some consequences on stellar ages of the time-varying physical constants as deduced from a modified form of Dirac's hypothesis are discussed. The variation of the gravitational "constant" is shown to be consistent with a Jordan theory of gravitation.
John O'Hanlon, Kwok-Kee Tam
openaire   +1 more source

Age and metallicity of low-mass galaxies: From their centres to their stellar halos

Astronomy & Astrophysics
Aims. In this work we aim to analyse the metallicity and the ages of the stellar halos of low-mass galaxies (M* ≲ 1010 M⊙) to better understand their formation history. Methods.
Tau Elisa A., Monachesi Antonela, Gómez Facundo A., Grand Robert J. J., Pakmor Rüdiger, van de Voort Freeke, Marinacci Federico, Bieri Rebekka   +7 more
doaj   +1 more source

The heavy element mixture and the stellar cluster age

Astrophysics and Space Science, 2006
Recent analyses of solar spectroscopic data (see Asplund, Grevesse & Sauval 2004 and references therein) suggest a significative variation of the heavy elements abundance. The change of heavy mixture might affect the determination of the clusters age for two different reasons: the change of theoretical isochrones at fixed metallicity and the ...
DEGL'INNOCENTI, SCILLA, PRADA MORONI, PIER GIORGIO, Ricci B.   +2 more
openaire   +2 more sources

APOKASC-3: The Third Joint Spectroscopic and Asteroseismic Catalog for Evolved Stars in the Kepler Fields

The Astrophysical Journal Supplement Series
In the third APOKASC catalog, we present data for the complete sample of 15,808 evolved stars with APOGEE spectroscopic parameters and Kepler asteroseismology.
Marc H. Pinsonneault, Joel C. Zinn, Jamie Tayar, Aldo Serenelli, Rafael A. García, Savita Mathur, Mathieu Vrard, Yvonne P. Elsworth, Benoit Mosser, Dennis Stello, Keaton J. Bell, Lisa Bugnet, Enrico Corsaro, Patrick Gaulme, Saskia Hekker, Marc Hon, Daniel Huber, Thomas Kallinger, Kaili Cao, Jennifer A. Johnson, Bastien Liagre, Rachel A. Patton, Ângela R. G. Santos, Sarbani Basu, Paul G. Beck, Timothy C. Beers, William J. Chaplin, Katia Cunha, Peter M. Frinchaboy, Léo Girardi, Diego Godoy-Rivera, Jon A. Holtzman, Henrik Jönsson, Szabolcs Mészáros, Claudia Reyes, Hans-Walter Rix, Matthew Shetrone, Verne V. Smith, Taylor Spoo, Keivan G. Stassun, Ji Wang   +40 more
doaj   +1 more source

Photometric Stellar Parameters for Asteroseismology and Galactic Studies

, 2014
Asteroseismology has the capability of delivering stellar properties which would otherwise be inaccessible, such as radii, masses and thus ages of stars.
Casagrande, Luca, Luca Casagrande
core   +1 more source

Quantifying Systematic Age Discrepancies in Very Young Star Clusters

The Astrophysical Journal
We infer the ages of three young stellar clusters—NGC 2004, NGC 7419, and NGC 2100—using Stellar Ages, a statistical algorithm designed to infer stellar population properties from color–magnitude diagrams.
Joseph Guzman, Jeremiah W. Murphy, Emma Beasor, Julianne J. Dalcanton, Nathan Smith, Mojgan Aghakhanloo, Benjamin F. Williams, Andrés F. Barrientos   +7 more
doaj   +1 more source

Predicting Young Stellar Ages with Deep Learning

, 2020
Studying the environments of star forming regions is critical to our understanding of early stellar evolution, but historically, observationally distinguishing clustered young stars from evolved field stars has been difficult.
McBride, Aidan, Lingg, Ryan
core  

The Effect of Different Methods for Accounting for α-enhancement on the Asteroseismic Modeling of Metal-poor Stars

The Astrophysical Journal
Constraining stellar models using asteroseismic and spectroscopic observations is a powerful method for precisely determining the fundamental properties of stars in different kinematic components of our Galaxy.
Christopher J. Lindsay, J. M. Joel Ong, Sarbani Basu, Samuel Grunblatt, Marc Hon   +4 more
doaj   +1 more source