期刊
ASTROPHYSICAL JOURNAL
卷 646, 期 1, 页码 297-303出版社
IOP PUBLISHING LTD
DOI: 10.1086/504865
关键词
open clusters and associations : individual (Orion); stars : rotation
Early observations of T Tauri stars suggested that stars with evidence of circumstellar accretion disks rotated slower than stars without such evidence, but more recent results are not as clear. Near-IR circumstellar disk indicators, although the most widely available, are subject to uncertainties that can result from inner disk holes and/or the system inclination. Mid-infrared observations are less sensitive to such effects, but until now, these observations have been difficult to obtain. The Spitzer Space Telescope now easily enables mid-infrared measurements of large samples of PMS stars covering a broad mass range in nearby star-forming regions. Megeath and collaborators surveyed the Orion Molecular Clouds (similar to 1 Myr) with the IRAC instrument (3.6, 4.5, 5.8, 8 mu m) as part of a joint IRAC and MIPS GTO program. We examine the relationship between rotation and Spitzer mid-IR fluxes for similar to 900 stars in Orion for stars between 3 and 0.1 M-circle dot. We find in these Spitzer data the clearest indication to date that stars with longer periods are more likely than those with short periods to have IR excesses suggestive of disks.
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