Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933710w&link_type=abstract
American Astronomical Society, AAS Meeting #219, #337.10
Astronomy and Astrophysics
Astronomy
Scientific paper
We are measuring parallactic distances to low mass (mainly M0-M5 spectral type) stars in Upper Scorpius. We estimate better the ages of individual disk-bearing stars and assess the age spread within the association. Pecaut et al. (2011) have recently reassessed the average age of Upper Sco at 10 Myr. However, even a spread of a couple million years in this average age affects our understanding of circumstellar disk lifetimes, because it appears disks dissipate with a timescale of ∼3 Myr. The Upper Scorpius OB association, which is 140 pc away, covers ? square degrees. Hipparcos parallax uncertainties on the O-G type stars were too large to measure the depth of the association, but de Bruijne (1999) estimated it at 50-60 pc. Yet the stars over this large volume appear to be approximately coeval. We have assembled a sample of 20 each of disk and disk-less stars from Carpenter et al. (2006). We are using the Carnegie Astrometric Planet Search Camera to measure parallaxes with precisions of ∼1 mas. For these stars with well known luminosities, we will compare the ages of the two groups. We will also assess the average age of the low mass stars compared to the higher mass stars studied with Hipparcos. Here, we will report on the first 13 stars, six with disks and seven without.
Anglada-Escude Guillem
Boss Alan P.
Weinberger Alycia J.
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