Testing the Disk Regulation Paradigm with Spitzer Observations: Low-Mass Stars

Details Testing the Disk Regulation Paradigm with Spitzer Observations: Low-Mass Stars Testing the Disk Regulation Paradigm with Spitzer Observations: Low-Mass Stars

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341301c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #413.01; Bulletin of the American Astronomical Society, Vol. 41, p.220

Astronomy and Astrophysics

Astronomy

Scientific paper

Using Spitzer data, we have recently shown an unambiguous correlation between pre-main sequence (PMS) star rotation periods and the presence of a circumstellar disk for stars with spectral type M2 and earlier in the young Orion Nebula Cluster and NGC 2264, providing clear evidence that star-disk interaction regulates PMS star angular momentum as they evolve onto the main sequence. However, previous IRAC data for these clusters were too shallow to study stars later than M2, a group which represents half the population of stars with known rotation periods and a fundamentally different regime from the higher mass stars. There is a sharp break in the behavior of the rotation period distributions at spectral type M2.5, suggesting a significant change in the efficiency or nature of the disk-regulation mechanism at this boundary. Subject to the timely availability of deep Spitzer Cycle-5 data, we will present preliminary results extending our study to a statistically significant sample of NGC 2264 stars with M3 and later spectral types. This will allow us to establish whether or not a disk-regulation mechanism is operating on very low-mass stars. Whatever the answer turns out to be, it will have very important implications for the fields of angular momentum evolution of PMS stars, disk evolution, and/or stellar structure.

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