Journal Article

Photometric search for variable stars in the young open cluster Berkeley 59

Sneh Lata, A. K. Pandey, G. Maheswar, Soumen Mondal and Brijesh Kumar

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 418, issue 2, pages 1346-1355
Published in print December 2011 | ISSN: 0035-8711
Published online November 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19582.x
Photometric search for variable stars in the young open cluster Berkeley 59

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We present the time series photometry of stars located in the extremely young open cluster Berkeley 59. Using the 1.04-m telescope at Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, we have identified 42 variables in a field of ∼13 × 13 arcmin2 around the cluster. The probable members of the cluster have been identified using a (V, VI) colour–magnitude diagram and a (JH, HK) colour–colour diagram. 31 variables have been found to be pre-main-sequence stars associated with the cluster. The ages and masses of the pre-main-sequence stars have been derived from the colour–magnitude diagram by fitting theoretical models to the observed data points. The ages of the majority of the probable pre-main-sequence variable candidates range from 1 to 5 Myr. The masses of these pre-main-sequence variable stars have been found to be in the range of ∼0.3 to ∼3.5 M, and these could be T Tauri stars. The present statistics reveal that about 90 per cent T Tauri stars have period <15 d. The classical T Tauri stars are found to have a larger amplitude than the weak-line T Tauri stars. There is an indication that the amplitude decreases with an increase in mass, which could be due to the dispersal of the discs of relatively massive stars.

Keywords: open clusters and associations: individual: Berkeley 59; stars: variables: T Tauri, Herbig Ae/Be

Journal Article.  5811 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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