SIMBAD references

2015ApJ...807...58B - Astrophys. J., 807, 58 (2015/July-1)

Bayesian ages for early-type stars from isochrones including rotation, and a possible old age for the Hyades.


Abstract (from CDS):

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, where the results of our analysis may be downloaded for individual early-type () Hipparcos stars. The web interface accepts user-supplied parameters for a Gaussian metallicity prior and returns posterior probability distributions on mass, age, and orientation.

Abstract Copyright:

Journal keyword(s): Hertzsprung-Russell and C-M diagrams - methods: statistical - stars: early-type

Simbad objects: 32

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