Results 21 to 30 of about 96,030 (294)

Gyrochronology and its usage for main sequence cool star ages [PDF]

, 2009
The construction of all age indicators consists of certain basic steps which lead to the identification of the properties desirable for stellar age indicators. Prior age indicators for main sequence field stars possess only some of these properties.
Donahue, Pizzolato, Strassmeier, Sydney A. Barnes   +3 more
core   +1 more source

Clusters: Age Scales for Stellar Physics [PDF]

EAS Publications Series, 2016
Ages are key to truly understand a large plethora of astrophysical phenomena. On the other hand, stellar clusters are open windows to understand stellar evolution, specifically, the change with time and mass of different stellar properties. As such, they are our laboratories where different theories can be tested, but without accurate ages, our ...
openaire   +2 more sources

From Young and Hot to Old and Cold: Comparing White Dwarf Cooling Theory to Main Sequence Stellar Evolution in Open Clusters [PDF]

, 2005
I explore the current ability of both white dwarf cooling theory and main sequence stellar evolution theory to accurately determine stellar population ages by comparing ages derived using both techniques for open clusters ranging from 0.1 to 4 Gyr.
Baraffe I., Carraro G., Lee S. H., Marconi G., Mermilliod J.-C., Perryman M. A. C., Siess L., Ted von Hippel, von Hippel T., Weidemann V.   +9 more
core   +3 more sources

Theoretical Re-evaluations of Scaling Relations between SMBHs and Their Host Galaxies–2. Importance of AGN Feedback Suggested by Stellar Age–Velocity Dispersion Relation

Frontiers in Astronomy and Space Sciences, 2017
We present the galactic stellar age—velocity dispersion relation obtained from a semi-analytic model of galaxy formation. We divide galaxies into two populations: galaxies which have over-massive/under-massive black holes (BHs) against the best-fitting ...
Hikari Shirakata, Toshihiro Kawaguchi, Takashi Okamoto, Tomoaki Ishiyama   +3 more
doaj   +1 more source

TESS Hunt for Young and Maturing Exoplanets (THYME). IX. A 27 Myr Extended Population of Lower Centaurus Crux with a Transiting Two-planet System

The Astronomical Journal, 2023
We report the discovery and characterization of a nearby (∼85 pc), older (27 ± 3 Myr), distributed stellar population near Lower Centaurus Crux (LCC), initially identified by searching for stars comoving with a candidate transiting planet from TESS (HD ...
Mackenna L. Wood, Andrew W. Mann, Madyson G. Barber, Jonathan L. Bush, Adam L. Kraus, Benjamin M. Tofflemire, Andrew Vanderburg, Elisabeth R. Newton, Gregory A. Feiden, George Zhou, Luke G. Bouma, Samuel N. Quinn, David J. Armstrong, Ares Osborn, Vardan Adibekyan, Elisa Delgado Mena, Sergio G. Sousa, Jonathan Gagné, Matthew J. Fields, Reilly P. Milburn, Pa Chia Thao, Stephen P. Schmidt, Crystal L. Gnilka, Steve B. Howell, Nicholas M. Law, Carl Ziegler, César Briceño, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Joshua E. Schlieder, Hugh P. Osborn, Joseph D. Twicken, David R. Ciardi, Chelsea X. Huang   +37 more
doaj   +1 more source

The Ages of Galactic Bulge Stars with Realistic Uncertainties

The Astrophysical Journal, 2023
Using modern isochrones with customized physics and carefully considered statistical techniques, we recompute the age distribution for a sample of 91 microlensed dwarfs in the Galactic bulge presented by Bensby et al.
Meridith Joyce, Christian I. Johnson, Tommaso Marchetti, R. Michael Rich, Iulia Simion, John Bourke   +5 more
doaj   +1 more source

Stellar Seismology, Stellar Ages and the Cosmological Constant

, 2001
Solar seismology has allowed precision measurements of both the static and dynamic structure of our local star, the Sun. In the near future, seismology of solar-like stars of different ages and masses, necessarily restricted by angular resolution to low l-modes, will allow studies of the internal structure of stars at various stages of evolution.
Isaak, George R., Isaak, Kate G.
openaire   +2 more sources

Using the Gaia Excess Uncertainty as a Proxy for Stellar Variability and Age

The Astrophysical Journal, 2023
Stars are known to be more active when they are young, resulting in a strong correlation between age and photometric variability. The amplitude variation between stars of a given age is large, but the age–variability relation becomes strong over large ...
Madyson G. Barber, Andrew W. Mann
doaj   +1 more source

The Galaxy Population of Abell 1367: The Stellar Mass-Metallicity Relation

, 2011
Using wide baseline broad-band photometry, we analyse the stellar population properties of a sample of 72 galaxies, spanning a wide range of stellar masses and morphological types, in the nearby spiral-rich and dynamically young galaxy cluster Abell 1367.
Balogh, Barnes, Barnes, Bell, Boselli, Bressan, Burstein, Buta, Butcher, Carter, Cortese, De Lucia, de Vaucouleurs, Donnelly, Dressler, Dressler, Driver, Faber, Gallazzi, Gao, Gavazzi, Gavazzi, Godwin, Gratton, Grebenev, Guenther, Guzmán, Hempel, James, Katz, Kennicutt, Kewley, Kewley, Korn, Kroupa, Lane, Lee, Lewis, M. Mouhcine, MacArthur, Michel-Dansac, Mihos, Moss, Moss, Moss, Moss, Nelan, Odell, P. A. James, Peeples, Peletier, Peletier, Pietrinferni, Poggianti, Puzia, Rakos, Rakos, Rakos, Rakos, Rose, Rose, Rupke, Rupke, Sakai, Schiavon, Schlegel, Schombert, Schombert, Smail, Smith, Smith, Struble, Sun, Sánchez-Blázquez, Taylor, Terlevich, Terlevich, Thomas, Thomas, Vazdekis, W. Kriwattanawong, West, Worthey, Worthey, Zaritsky   +84 more
core   +1 more source

The ages, metallicities and star formation histories of early-type galaxies in SDSS [PDF]

, 2006
We use the spectra of ~ 22,000 early-type galaxies, selected from the Sloan Digital Sky Survey, to infer the ages, metallicities and star formation histories of these galaxies. We find clear evidence of "downsizing", i.e.
Alan F. Heavens, Ben Panter, Bower R., Mariangela Bernardi, Raul Jimenez, Zoltan Haiman   +5 more
core   +2 more sources