The Monitor project: rotation of low-mass stars in NGC 2362 - testing the disc regulation paradigm at 5 Myr

Jonathan Irwin, Simon Hodgkin, Suzanne Aigrain, Jerome Bouvier, Leslie Hebb, Mike Irwin, Estelle Moraux

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

We report on the results of a time-series photometric survey of NGC 2362, carried out using the CTIO 4-m 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 less than or similar to M/M-circle dot less than or similar to. 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 similar to 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-infrared (mid-IR) measurements, we found that three to four 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.

Original languageEnglish
Pages (from-to)675-686
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume384
DOIs
Publication statusPublished - 21 Feb 2008

Keywords

  • techniques : photometric
  • surveys
  • stars : pre-main-sequence
  • stars : rotation
  • open clusters and associations : individual : NGC 2362
  • ORION-NEBULA-CLUSTER
  • MAIN-SEQUENCE STARS
  • COLOR-MAGNITUDE DIAGRAMS
  • YOUNG OPEN CLUSTERS
  • SPITZER OBSERVATIONS
  • EVOLUTIONARY MODELS
  • STELLAR ROTATION
  • BROWN DWARFS
  • VARIABILITY
  • DISTANCE

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