Statistical Analysis of the Relationship Between Rotation, Disks, and X-rays Among Low-Mass Pre-Main-Sequence Stars

Details Statistical Analysis of the Relationship Between Rotation, Disks, and X-rays Among Low-Mass Pre-Main-Sequence Stars Statistical Analysis of the Relationship Between Rotation, Disks, and X-rays Among Low-Mass Pre-Main-Sequence Stars

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921906s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #219.06; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Two fundamental outstanding questions in the study of young, low-mass stars are (1) the evolution of angular momentum, and (2) the origin of X-ray emission. Indeed, low-mass stars are observed to decrease their angular momentum content by nearly an order of magnitude during the first ˜100 Myr. These stars are also observed to produce X-rays at levels up to 3-4 orders of magnitude higher than the present-day Sun. However, the physical processes governing angular momentum loss and X-ray production during the pre-main-sequence (PMS) phase remain poorly understood. Circumstellar disks are thought to regulate stellar rotation via magnetic star-disk interaction. Stellar magnetic fields, possibly driven by rotation, may also be implicated in the production of X-rays, which may in turn affect disk ionization and thus the efficiency of star-disk coupling. Finally, all of these stellar properties - rotation, disks, X-rays - are dependent in varying degrees on stellar mass. Using a sample of 400 PMS stars with known rotation periods, disk tracers from Spitzer, and X-ray luminosities from Chandra, we perform a multivariate statistical analysis on the relationships among these manifold mutually correlated variables. Our aim is to discern the fundamental relationship between disks and stellar rotation, and between rotation and X-ray emission. Here we report preliminary results.

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