Journal Article

Pre-main-sequence variable stars in young open cluster NGC 1893

Sneh Lata, A. K. Pandey, W. P. Chen, G. Maheswar and Neelam Chauhan

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 2, pages 1449-1462
Published in print December 2012 | ISSN: 0035-8711
Published online December 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.22070.x
Pre-main-sequence variable stars in young open cluster NGC 1893

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We present results of multi-epoch (14 nights during 2007–2010) V-band photometry of the cluster NGC 1893 region to identify photometric variable stars in the cluster. The study identified a total of 53 stars showing photometric variability. The members associated with the region are identified on the basis of spectral energy distribution, JH/HK two-colour diagram and V/VI colour–magnitude diagram. The ages and masses of the majority of pre-main-sequence sources are found to be ≲5 Myr and in the range , respectively. These pre-main-sequence sources hence could be T Tauri stars. We also determined the physical parameters like disc mass and accretion rate from the spectral energy distribution of these T Tauri stars. The periods of majority of the T Tauri stars range from 0.1 to 20 d. The brightness of Classical T Tauri stars is found to vary with larger amplitude in comparison to weak line T Tauri stars. It is found that the amplitude decreases with increase in mass, which could be due to the dispersal of discs of massive stars.

Keywords: stars: pre-main-sequence; stars: variables: T Tauri, Herbig Ae/Be; open clusters and associations: individual: NGC 1893

Journal Article.  8485 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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