Bayesian Ages for Early-type Stars from Isochrones Including Rotation, and a Possible Old Age for the Hyades

Brandt, Timothy D. and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 (2015) Bayesian Ages for Early-type Stars from Isochrones Including Rotation, and a Possible Old Age for the Hyades. The Astrophysical Journal, 807 (1):58. pp. 1-10. ISSN 1538-4357

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Abstract

We combine recently computed models of stellar evolution using a new treatment of rotation with a Bayesian statistical framework to constrain the ages and other properties of early-type stars. We find good agreement for early-type stars and clusters with known young ages, including β Pictoris, the Pleiades, and the Ursa Majoris moving group. However, we derive a substantially older age for the Hyades open cluster (750 ± 100 Myr compared to 625 ± 50 Myr). This older age results from both the increase in main-sequence lifetime with stellar rotation and from the fact that rotating models near the main-sequence turnoff are more luminous, overlapping with slightly more massive (and shorter-lived) nonrotating ones. Our method uses a large grid of nonrotating models to interpolate between a much sparser rotating grid, and also includes a detailed calculation of synthetic magnitudes as a function of orientation. We provide a web interface at http://www.bayesianstellarparameters.info, where the results of our analysis may be downloaded for individual early-type (B - V ≲ 0.25) Hipparcos stars. The web interface accepts user-supplied parameters for a Gaussian metallicity prior and returns posterior probability distributions on mass, age, and orientation.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item made available in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 31 Mar 2022 00:24
Last Modified: 31 Mar 2022 01:23
Uncontrolled Keywords: Hertzsprung–Russell and C–M diagrams; methods: statistical; stars: early-type; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.1088/0004-637x/807/1/58
URI: http://eprints.usq.edu.au/id/eprint/47434

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