New Open Cluster Candidates Discovered in the XSTPS-GAC Survey
arXiv:1801.00146 · doi:10.1088/1674-4527/18/3/32
Abstract
The Xuyi Schmidt Telescope Photometric Survey of the Galactic Anti-center (XSTPS-GAC) is a photometric sky survey that covers nearly 6 000 deg^2 towards Galactic anti-center in g r i bands. Half of its survey field locates on the Galactic Anti-center disk, which makes XSTPS-GAC highly suitable for searching new open clusters in the GAC region. In this paper, we report new open cluster candidates discovered in this survey, as well as properties of these open cluster candidates, such as age, distance and reddening, derived by isochrone fitting in the color-magnitude diagram (CMD). These open cluster candidates are stellar density peaks detected in the star density maps by applying the method from Koposov et al. (2008). Each candidate is inspected on its true color image composed from XSTPS-GAC three band images. Then its CMD is checked, in order to identify whether the central region stars have a clear isochrone-like trend differing from the background stars. The parameters derived from isochrone fitting for these candidates are mainly based on three band photometry of XSTPS-GAC. Meanwhile, when these new candidates are able to be seen clearly on 2MASS, their parameters are also derived based on 2MASS (J-H, J) CMD. Finally, there are 320 known open clusters rediscovered and 24 new open cluster candidates discovered in this work. Further more, the parameters of these new candidates, as well as another 11 known recovered open clusters, are properly determined for the first time.
arXiv comment19 pages, 11 figures, 3 tables, accepted for publication in Research in Astronomy and Astrophysics
References in corpus (23)
- Embedded Clusters in Molecular Clouds
- Theoretical isochrones in several photometric systems I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington, and ESO Imaging Survey filter sets
- Young massive star clusters
- The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
- VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way
- New catalogue of optically visible open clusters and candidates
- The PPMXL catalog of positions and proper motions on the ICRS. Combining USNO-B1.0 and 2MASS
- Global survey of star clusters in the Milky Way II. The catalogue of basic parameters
- Astrophysical parameters of Galactic open clusters
- The Second-Generation Guide Star Catalog: Description and Properties
- Empirical extinction coefficients for the GALEX, SDSS, 2MASS and WISE passbands
- The Origin of Massive O-type Field Stars. Part II: Field O stars as runaways
- A systematic survey for infrared star clusters with |b|<20deg using 2MASS
- The LAMOST Stellar Parameter Pipeline at Peking University --- LSP3
- New Galactic Star Clusters Discovered in the VVV Survey
- New galactic open cluster candidates from DSS and 2MASS imagery
- Global survey of star clusters in the Milky Way I. The pipeline and fundamental parameters in the second quadrant
- Automated search for galactic star clusters in large multiband surveys: I. Discovery of 15 new open clusters in the Galactic anticenter region
- Faint open clusters with 2MASS: BH 63, Lyngå2, Lyngå12 and King 20
- Methods for improving open cluster fundamental parameters applied to M 52 and NGC 3960
- Atmospheric Extinction Coefficients and Night Sky Brightness At the Xuyi Observational Station
- Strengthening the Open Cluster Distance Scale via VVV Photometry
- An Improved Photometric Calibration of the Sloan Digital Sky Survey Imaging Data