The Monitor project: rotation periods of low-mass stars in M50 |
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| Authors: | Jonathan Irwin Suzanne Aigrain Jerome Bouvier Leslie Hebb Simon Hodgkin Mike Irwin Estelle Moraux |
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| Institution: | Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA;Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA;Astrophysics Group, School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL;Laboratoire d'Astrophysique, Observatoire de Grenoble, BP 53, F-38041 Grenoble Cédex 9, France;School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS |
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| Abstract: | 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. |
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| Keywords: | techniques: photometric surveys stars: pre-main-sequence stars: rotation open clusters and associations: individual: M50 |
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