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- W4385724054 endingPage "127" @default.
- W4385724054 startingPage "127" @default.
- W4385724054 abstract "Abstract 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 groups of stars. We explore this relation using the excess photometric uncertainty in Gaia photometry ( V ar G , V ar BP , and V ar RP ) as a proxy for variability. The metrics follow a Skumanich-like relation, scaling as ≃ t −0.4 . By calibrating against a set of associations with known ages, we show how the V ar of population members can predict group ages within 10%–20% for associations younger than ≃2.5 Gyr. In practice, age uncertainties are larger, primarily due to the finite group size. The index is most useful at the youngest ages (<100 Myr), where the uncertainties are comparable to or better than those derived from a color–magnitude diagram (CMD). The index is also widely available, easy to calculate, and can be used at intermediate ages where there are few or no pre- or post-main-sequence stars. We further show how V ar can be used to find new associations and test if a group of comoving stars is a real coeval population. We apply our methods to Theia groups within 350 pc and find ≳90% are inconsistent with drawing stars from the field and ≃80% have variability ages consistent with those derived from the CMD. Our findings suggest the great majority of these groups contain real populations." @default.
- W4385724054 created "2023-08-11" @default.
- W4385724054 creator A5009191583 @default.
- W4385724054 creator A5030380873 @default.
- W4385724054 date "2023-08-01" @default.
- W4385724054 modified "2023-09-27" @default.
- W4385724054 title "Using the Gaia Excess Uncertainty as a Proxy for Stellar Variability and Age" @default.
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