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| Paper: |
Stellar Diameters in the Beta Pic Moving Group |
| Volume: |
487, Resolving The Future Of Astronomy With Long-Baseline Interferometry |
| Page: |
49 |
| Authors: |
Simon, M.; Schaefer, G. H. |
| Abstract: |
Members of the Beta Pic Moving Group (BPMG) are young enough (10-20 MY)
and near enough (< 50 pc) that some are resolvable with the CHARA
Interferometric Array in the H and K bands. The capability to measure the
radius of a star as it contracts is important because it provides a
new way to measure the stars age by reference to models of its evolution.
We measured the angular diameters of the BPMG members HIP 560 (F3V) and
HIP 21547 (F0V) using the interferometer with the CLASSIC beam combiner.
Our observing assignment was in the time the CHARA administration made
publicly available through the NOAO application process. The limb-darkened
angular diameters of HIP 560 and 21547 are 0.492±0.032 and
0.518±0.009 mas, respectively. The corresponding stellar
radii are 2.1 (HIP 560) and 1.6 Rsun (HIP 21547). These values
indicate that HIP 560 and 21547 are truly young. Comparison
to theoretical evolutionary models indicates their age is 13±2 MY.
We describe our observations and results briefly here and discuss the
studies that will become possible in the near future. A more detailed
account is given in our paper “Measured Diameters of 2 F-stars in the Beta
Pic Moving Group,” submitted to the Astrophysical Journal. |
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