Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-15
Astronomy and Astrophysics
Astrophysics
13 pages, 17 figures, 1 table. Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2007.12725.x
We report on the results of a time-series photometric survey of NGC 2362, carried out using the CTIO 4m Blanco telescope and Mosaic-II detector as part of the Monitor project. Rotation periods were derived for 271 candidate cluster members over the mass range 0.1 <~ M/Msol <~ 1.2. The rotation period distributions show a clear mass-dependent morphology, qualitatively similar to that in NGC 2264, as would be expected from the age of this cluster. Using models of angular momentum evolution, we show that angular momentum losses over the ~1-5 Myr age range appear to be needed in order to reproduce the evolution of the slowest rotators in the sample from the ONC to NGC 2362, as found by many previous studies. By incorporating Spitzer IRAC mid-IR measurements, we found that 3-4 objects showing mid-IR excesses indicative of the presence of circumstellar discs were all slow rotators, as would be expected in the disc regulation paradigm for early pre-main sequence angular momentum evolution, but this result is not statistically significant at present, given the extremely limited sample size.
Aigrain Suzanne
Bouvier Jerome
Hebb Leslie
Hodgkin Simon
Irwin Jonathan
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