Journal Article

The Monitor project: rotation periods of low-mass stars in M50

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

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 392, issue 4, pages 1456-1466
Published in print February 2009 | ISSN: 0035-8711
Published online January 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14158.x
The Monitor project: rotation periods of low-mass stars in M50

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We report on the results of a time-series photometric survey of M50 (NGC 2323), a ∼130 Myr open cluster, carried out using the Cerro Tololo Inter-American Observatory (CTIO) 4-m Blanco telescope and Mosaic-II detector as part of the Monitor project. Rotation periods were derived for 812 candidate cluster members over the mass range 0.2 ≲M/M≲ 1.1. The rotation period distributions show a clear mass-dependent morphology, statistically indistinguishable from those in NGC 2516 and M35 taken from the literature. Due to the availability of data from three observing runs separated by ∼10 and 1 month time-scales, we are able to demonstrate clear evidence for evolution of the photometric amplitudes, and hence spot patterns, over the 10 month gap. We are not able to constrain the time-scales for these effects in detail due to limitations imposed by the large gaps in our sampling, which also prevent the use of the phase information.

Keywords: techniques: photometric; surveys; stars: pre-main-sequence; stars: rotation; open clusters and associations: individual: M50

Journal Article.  6968 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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