Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.4910m&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #49.10; Bulletin of the American Astronomical Society, Vol. 28, p.1339
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We report initial results of a study aimed at an empirical definition of the angular momentum evolution of low mass (M < 0.5 Msun) stars in NGC 2264. These stars are intermediate in age between the "stellar birthline" and the zero age main sequence (ZAMS). We have measured rotation periods from CCD imaging observations of starspot-modulated light curves for a large proper-motion-selected sample of pre-main sequence (PMS) stars in NGC 2264. Our deep VRIJHK photometric survey (reported here for the first time) indicates that this sample: (a) comprises PMS stars with ages 1 < t < 15 Myr, and (b) contains objects still surrounded by circumstellar accretion disks, and objects which lack disks. It is thus ideally suited for testing whether, as hypothesized, (a) accretion disks regulate PMS stars of a given mass to an approximately constant period as they contract toward the ZAMS; and (b) whether the rotational evolution of low mass stars which lack disks primarily reflects contraction as these PMS objects approach the ZAMS, or whether angular momentum loss is significant.
Adams Terrence M.
Herbst William
Jones Barbara
Kearns Kristin
Makidon Russell B.
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