Rotation and Circumstellar Disks in the Upper Scorpius OB Association

Details Rotation and Circumstellar Disks in the Upper Scorpius OB Association Rotation and Circumstellar Disks in the Upper Scorpius OB Association

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733912d&link_type=abstract

American Astronomical Society, AAS Meeting #217, #339.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present projected rotational velocities for 20 early-type (B8-A9) and 53 late-type (F3-M8) members of the 5 Myr old Upper Scorpius OB Association determined using high-resolution optical spectra obtained with HIRES on Keck I and MIKE on the Magellan Clay telescope. The Upper Scorpius sample is composed of primordial and debris disk systems as well as non-excess sources. We combine the derived rotational velocities with Spitzer Space Telescope IRAC 4.5 and 8.0 μm fluxes and MIPS 24.0 μm photometry in order to examine the influence of circumstellar disks upon stellar and substellar rotation. Preliminary results using non-parametric statistical tests suggest that the late-type disk-bearing members of Upper Scorpius rotate more slowly than their non-disk counterparts at a high confidence level. Among the early-type Upper Scorpius members, however, the rotational velocities of the debris-disk and non-disk populations are indistinguishable. We also compare the rotational velocities of the Upper Scorpius sample with those of similar sources in Taurus-Auriga, where stars may not have had sufficient time to undergo disk-braking.

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