Results 51 to 60 of about 9,515,740 (309)

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

Eclipsing binary stars as tests of stellar evolutionary models and stellar ages

Proceedings of the International Astronomical Union, 2008
AbstractEclipsing binary stars provide highly accurate measurements of the fundamental physical properties of stars. They therefore serve as stringent tests of the predictions of evolutionary models upon which most stellar age determinations are based.
Stassun, Keivan G., Hebb, Leslie, Lopez-Morales, Mercedes, Prsa, Andrej   +3 more
openaire   +2 more sources

Stellar population synthesis at the resolution of 2003 [PDF]

, 2003
We present a new model for computing the spectral evolution of stellar populations at ages between 1 x 10 5 and 2 x 10 1 0 yr at a resolution of 3 A across the whole wavelength range from 3200 to 9500 A for a wide range of metallicities.
G. Bruzual, S. Charlot
semanticscholar   +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

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

STELLAR AGES AND CONVECTIVE CORES IN FIELD MAIN-SEQUENCE STARS: FIRST ASTEROSEISMIC APPLICATION TO TWO KEPLER TARGETS [PDF]

, 2013
Using asteroseismic data and stellar evolution models we obtain the first detection of a convective core in a Kepler field main-sequence star, putting a stringent constraint on the total size of the mixed zone and showing that extra mixing beyond the ...
V. Silva Aguirre, S. Basu, I. Brandao, J. Christensen-Dalsgaard, S. Deheuvels, G. Doğan, T. Metcalfe, A. Serenelli, J. Ballot, W. Chaplin, M. Cunha, A. Weiss, T. Appourchaux, L. Casagrande, S. Cassisi, O. Creevey, R. García, Y. Lebreton, A. Noels, S. Sousa, D. Stello, T. White, S. Kawaler, H. Kjeldsen   +23 more
semanticscholar   +1 more source

The stellar populations of the bluest low surface brightness galaxies

, 2005
Using optical/near-IR broadband photometry together with Halpha emission line data, we attempt to constrain the star formation histories, ages, total stellar masses and stellar mass-to-light ratios for a sample of extremely blue low surface brightness ...
Beijersbergen, Bell, Bell, Bergvall, Bergvall, Boissier, Burstein, Calzetti, Chabrier, Clegg, Copetti, Dalcanton, de Blok, de Blok, de Jong, Dong, E. Zackrisson, Ferguson, G. Östlin, Gil de Paz, Hoffman, Izotov, Jimenez, Jimenez, Jimenez, Karick, Kilborn, Kroupa, Kroupa, Kunth, Larson, Leitherer, Lejeune, Martin, Mateo, Matthews, McGaugh, McGaugh, McGaugh, McGaugh, McGaugh, Miller, Miller, N. Bergvall, Nagamine, O'Neil, O'Neil, O'Neil, Olofsson, Padoan, Pfenniger, Pilyugin, Portinari, Rosenbaum, Rönnback, Rönnback, Schechter, Schombert, Tegmark, Thomas, van den Hoek, Vazdekis, Worthey, Zackrisson, Zavala, Östlin   +65 more
core   +1 more source

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

A Relationship between Stellar Age and Spot Coverage [PDF]

The Astrophysical Journal, 2020
Abstract We investigate starspot distributions consistent with space-based photometry of F, G, and K stars in six stellar associations ranging in age from 10 Myr to 4 Gyr. We show that a simple light-curve statistic called the “smoothed amplitude” is proportional to stellar age as t −1/2, following a Skumanich-like spin-
openaire   +2 more sources

Quantitative chemical tagging, stellar ages and the chemo-dynamical evolution of the Galactic disc [PDF]

, 2013
The early science results from the new generation of high-resolution stellar spectroscopic surveys, such as Galactic Archaeology with HERMES (GALAH) and the Gaia European Southern Observatory survey (Gaia-ESO), will represent major milestones in the ...
A. Mitschang, G. D. Silva, D. Zucker, B. Anguiano, T. Bensby, S. K. S. I. C. F. Astronomy, Astrophysics, Astrophotonics, D. Physics, Astronomy, Macquarie University, Australian Astronomical Observatory, L. Observatory, D. O. Astronomy, T. Physics   +14 more
semanticscholar   +1 more source