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

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

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19 Scopus citations

Abstract

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, J - H/H - K two-colour diagram and V/V - I colour-magnitude diagram. The ages and masses of the majority of pre-main-sequence sources are found to be ≲5Myr and in the range 0.5≲M/M≲4, 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 20d. 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.

Original languageEnglish
Pages (from-to)1449-1462
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume427
Issue number2
DOIs
StatePublished - 1 Dec 2012

Keywords

  • Open clusters and associations: individual: NGC 1893
  • Stars: pre-main-sequence
  • Stars: variables: T Tauri, Herbig Ae/Be

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