Results 11 to 20 of about 96,030 (294)

MASSCLEANage -- Stellar Cluster Ages from Integrated Colors -- [PDF]

The Astrophysical Journal, 2010
We present the recently updated and expanded MASSCLEANcolors, a database of 70 million Monte Carlo models selected to match the properties (metallicity, ages and masses) of stellar clusters found in the Large Magellanic Cloud (LMC).
Bica, Billett, Bogdan Popescu, Bruzual, Cantiello, Chandar, Chiosi, Fouesneau, Fouesneau, Girardi, González, Harris, Hunter, Lançon, Lançon, Larsen, M. M. Hanson, Maíz Apellániz, Popescu, Popescu, Popescu, Raimondo, Raimondo, Santos, van den Bergh   +24 more
core   +2 more sources

Stellar Ages: A Code to Infer Properties of Stellar Populations

The Astrophysical Journal
We present a novel statistical algorithm, Stellar Ages, which currently infers the age, metallicity, and extinction posterior distributions of stellar populations from their magnitudes.
Joseph J. Guzman, Jeremiah W. Murphy, Andrés F. Barrientos, Benjamin F. Williams, Julianne J. Dalcanton   +4 more
doaj   +3 more sources

Ages and Age Spreads in Young Stellar Clusters

, 2017
I review progress towards understanding the time-scales of star and cluster formation and of the absolute ages of young stars. I focus in particular on the areas in which Francesco Palla made highly significant contributions - interpretation of the ...
Jeffries, R. D.
core   +2 more sources

How accurate are stellar ages based on stellar models? [PDF]

EAS Publications Series, 2014
83 pages, 46 figures, contribution to the proceedings of the 13rd Evry Schatzman School on Stellar Astrophysics, "The Ages of Stars", Roscoff 2013, EAS Publications Series, eds. Y. Lebreton, D.
Lebreton, Yveline, Goupil, Marie-Jo, Montalban, J.   +2 more
openaire   +5 more sources

Forever young white dwarfs: When stellar ageing stops [PDF]

Astronomy & Astrophysics, 2021
White dwarf stars are the most common end point of stellar evolution. The ultramassive white dwarfs are of special interest as they are related to type Ia supernovae explosions, merger events, and fast radio bursts. Ultramassive white dwarfs are expected to harbour oxygen-neon (ONe) cores as a result of single standard stellar ...
Camisassa, María Eugenia, Althaus, Leandro G., Torres Gil, Santiago, Córsico, Alejandro H., Rebassa Mansergas, Alberto, Tremblay, P. E., Cheng, Sihao, Raddi, Roberto   +7 more
openaire   +5 more sources

Stellar ages from stellar rotation [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractOur ability to determine stellar ages from measurements of stellar rotation, hinges on how well we can measure the dependence of rotation on age for stars of different masses. Rotation periods for stars in open clusters are essential to determine the relations between stellar age, rotation, and mass.
openaire   +2 more sources

Confronting substellar theoretical models with stellar ages [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractBy definition, brown dwarfs never reach the main-sequence, cooling and dimming over their entire lifetime, thus making substellar models challenging to test because of the strong dependence on age. Currently, most brown dwarfs with independently determined ages are companions to nearby stars, so stellar ages are at the heart of the effort to ...
Dupuy, Trent J., Liu, Michael C., Ireland, Michael J.   +2 more
openaire   +2 more sources

Measurement of stellar age from uranium decay [PDF]

Nature, 2001
The ages of the oldest stars in the Galaxy indicate when star formation began, and provide a minimum age for the Universe. Radioactive dating of meteoritic material and stars relies on comparing the present abundance ratios of radioactive and stable nuclear species to the theoretically predicted ratios of their production.
Cayrel, R., Hill, V., Beers, T.C., Barbuy, B., Spite, M.E., Spite, F., Plez, B., Andersen, J., Bonifacio, P., Francois, P., Molaro, P., Nordström, B., Primas, F.   +12 more
openaire   +4 more sources

Wrinkles in Time. I. Rapid Rotators Found in High-eccentricity Orbits

The Astrophysical Journal, 2023
Recent space-based missions have ushered in a new era of observational astronomy, where high-cadence photometric light curves for thousands to millions of stars in the solar neighborhood can be used to test and apply stellar age-dating methods, including
Rayna Rampalli, Amy Smock, Elisabeth R. Newton, Kathryne J. Daniel, Jason L. Curtis   +4 more
doaj   +1 more source

The Stellar Disk Component: Distribution, Motions, Age and Stellar Composition [PDF]

Symposium - International Astronomical Union, 1985
The distribution of the stellar disk component is studied with particular emphasis on the properties of open clusters. A scale height of 80 pc is found for clusters younger than 109years while the scale height is 200 pc for older clusters. A radial metallicity gradient in the disk is confirmed but there seem to be significant abundance variations apart
openaire   +1 more source