Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....121.1676r&link_type=abstract
The Astronomical Journal, Volume 121, Issue 3, pp. 1676-1709.
Astronomy and Astrophysics
Astronomy
70
Stars: Pre-Main-Sequence, Stars: Rotation
Scientific paper
We have photometrically monitored ~3600 young, low-mass stars in four 45'×45' fields in the outer Orion Nebula cluster, surrounding but not including the Trapezium region. The 281 periodic variables we find do not produce the expected bimodal distribution of rotation periods. There is no unambiguous correlation of period with IC-Ks, H-Ks, and U-V color excesses or more indirect disk indicators; the slowest rotators are not necessarily the disk candidates, and the disk candidates are not necessarily the slow rotators, regardless of how one defines a disk candidate. To the extent that the small numbers allow, the disk candidates represent a constant fraction of the total sample to P=15 days, beyond which there are no disk candidates, inconsistent with the hypothesis that the more slowly rotating stars are more likely to have disks. We find an intriguing relationship between specific angular momentum (j) and some excesses, namely, H-Ks excesses and the strongest U-V excesses; whereas stars are found with j values ranging over ~106-108 km2 s-1, disk candidates with these excesses are restricted to 106.5 km2 s-1
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