Results 41 to 50 of about 9,515,740 (309)
Stellar age determination in the mass–luminosity plane
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT The ages of stars have historically relied on isochrone fitting of standardized grids of models. While these stellar models have provided key constraints on observational samples of massive stars, they inherit many systematic uncertainties, mainly in the internal mixing mechanisms applied throughout the grid, fundamentally ...
Higgins, Erin R., Vink, Jorick S.
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stardate: Combining dating methods for better stellar ages
Journal of Open Source Software, 2019 Age is the most difficult fundamental stellar property to measure, particularly for stars on the main sequence. These stars change slowly in brightness and temperature, so measuring their ages via placement on the Hertzsprung-Russell or color-magnitude ...
R. Angus, T. Morton, D. Foreman-Mackey
semanticscholar +1 more source
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 +3 more
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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 ...
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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. +2 more
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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 +37 more
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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
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THE AGE AND STELLAR PARAMETERS OF THE PROCYON BINARY SYSTEM [PDF]
The Astrophysical Journal, 2013 Accepted for the Astrophysical Journal, in ...
Liebert, James +4 more
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Uncertainties in asteroseismic grid-based estimates of stellar ages: SCEPtER: Stellar CharactEristics Pisa Estimation gRid [PDF]
, 2014 We study the impact on stellar age determination by means of grid-based techniques adopting asteroseismic constraints of the uncertainty in the radiative opacity, in the initial helium abundance, in the mixing-length value, in the convective core ...
G. Valle +4 more
semanticscholar +1 more source
Addressing Systematics in the Traceback Age of the β Pictoris Moving Group
The Astrophysical Journal, 2023 We characterize the impact of several sources of systematic errors on the computation of the traceback age of the β Pictoris moving group ( β PMG). We find that uncorrected gravitational redshift and convective blueshift bias absolute radial velocity ...
Dominic Couture +2 more
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