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

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Abstract

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 × 13arcmin2 around the cluster. The probable members of the cluster have been identified using a (V, V-I) colour-magnitude diagram and a (J-H, H-K) 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 5Myr. 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 90percent T Tauri stars have period <15d. 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. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.

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Lata, S., Pandey, A. K., Maheswar, G., Mondal, S., & Kumar, B. (2011). Photometric search for variable stars in the young open cluster Berkeley 59. Monthly Notices of the Royal Astronomical Society, 418(2), 1346–1355. https://doi.org/10.1111/j.1365-2966.2011.19582.x

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