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On the Relationship Between Stellar Rotation and Radius in Young Clusters

Published online by Cambridge University Press:  26 May 2016

L. M. Rebull
Affiliation:
SIRTF Science Center, Caltech, M/S 220-6, 1200 E. California Blvd., Pasadena, CA, 91125
S. C. Wolff
Affiliation:
NOAO, Tucson, AZ
S. E. Strom
Affiliation:
NOAO, Tucson, AZ
R. B. Makidon
Affiliation:
STScI, Baltimore, MD

Abstract

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We have compiled data from the literature on rotational velocities and/or periods for > 1000 K & M stars in 10 young clusters ranging in age from Orion to the IC 1391/2602. These data show that most PMS stars < 3 Myr do not appear to spin up in response to contraction, but there is a suggestion of slight spinup by ~8 Myr. These results extend and reinforce our earlier study (Rebull et al. 2002), based on observations of ~300 stars in the Orion Flanking Fields, NGC 2264, and the Orion Nebula Cluster (ONC), which showed that the majority of PMS stars in these three groups apparently do not conserve stellar angular momentum as they contract, but instead evolve at nearly constant angular velocity. This result applies both to stars with and without near-IR IK excesses indicative of disks.

Type
Session 1 Observations of Rotating Stars
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Königl, A., 1991, ApJL 370, 39 Google Scholar
Rebull, L. M., et al., 2002, AJ 124, 546 Google Scholar