Deep V and I CCD photometry of young star cluster NGC 1893 with the 3.6m DOT

Abstract

Young star clusters consisting of massive stars are the ideal sites to study the star formation processes and influence of massive stars on the subsequent star formation. NGC 1893 is a young star cluster associated with the HII region Sh2-236. It contains about five `O'-type stars and several early `B'-type stars. It is located at a distance of $\sim$3.25 kpc and has a reddening, E(B-V)$\sim$0.4 mag. To characterize the young low-mass stellar population in the central portion of the cluster, we carried out deep VI band observations of the region using the 4K$\times$4K CCD IMAGER mounted on the 3.6-m DOT. Our analysis shows that the present data are deep enough to detect stars below $\sim$24 mag. We found optical counterparts of $\sim$220 candidate members, including young stars and unclassified cluster members from Caramazza et al. (2008). We estimated the membership probabilities of the Gaia sources (mostly bright stars with G$<$19 mag) located within the cluster radius using the Gaia EDR3. Toward the fainter end, we used the optical color-magnitude diagram (CMD) to select the cluster members from a sample of young stars. The unclassified member candidates and X-ray sources from Caramazza et al. (2012) are also found to be young low-mass stars. In total, we identified $\sim$425 young stars with age$<$10 Myr, and 110 of these are new. Most of these stars appear kinematic members of the cluster. By examining the CMD for the stars in the cluster region, we suggest that the cluster has insignificant contamination due to field stars in the pre-main sequence zone of the CMD. The slope of the mass function in the mass range 0.2$\le$M/M$\odot$$\le$2.5 is found to be $\Gamma$ = -1.43 $\pm$ 0.15, consistent with those of other star-forming complexes. The spatial distribution of the young stars as a function of mass suggests that toward the cluster center, most of the stars are massive.

Accepted for publication in Special Issue of Journal of Astrophysics & Astronomy, 2022, Astrophysical jets and observational facilities: National perspective, 05 - 09 April 2021, ARIES Nainital

References in corpus (9)

• The Importance of Radiative Feedback for the Stellar Initial Mass Function
• Parallax Systematics and Photocenter Motions of Benchmark Eclipsing Binaries in Gaia EDR3
• Star formation in young star cluster NGC 1893
• The Spatial Structure of Young Stellar Clusters. II. Total Young Stellar Populations
• Testing the role of environmental effects on the initial mass function of low-mass stars
• Circumstellar Disks in the Outer Galaxy: the Star-Forming Region NGC 1893
• Young cluster Berkeley 59 : Properties, evolution and star formation
• Main-sequence variable stars in young open cluster NGC 1893
• Sejong Open Cluster Survey (SOS). III. The Young Open Cluster NGC 1893 in the H II Region W8

Cited by in corpus (2)

• Optical Observations of star clusters NGC 1513 and NGC 4147; white dwarf WD1145+017 and $K$ band imaging of star forming region Sh2-61 with the 3.6 meter Devasthal Optical Telescope
• Pathway to Devasthal Astronomical Observatory, ARIES