A study of the NGC 1193 and NGC 1798 open clusters using CCD UBV photometric and Gaia EDR3 data

Abstract

We present photometric, astrometric, and kinematic studies of the old open star clusters NGC 1193 and NGC 1798. Both of the clusters are investigated by combining data sets from Gaia EDR3 and CCD UBV observational data. Analysis of the radial distribution of stars through the cluster regions indicates that the cluster limit radii are $r_{\lim }=8^{\prime }$ for both of the clusters. We determine the membership probabilities of stars considering Gaia EDR3 proper motion and trigonometric parallax data, resulting in 361 stars in NGC 1193 and 428 in NGC 1798 being identified as most likely cluster members, having membership probabilities greater than P>0.5. Mean proper motion components are estimated as (${\mu }_{\alpha }\cos \delta$, ${\mu }_{\delta })=(-0.207(0.009),-0.431(0.008)$) for NGC 1193 and (${\mu }_{\alpha }\cos \delta$, ${\mu }_{\delta })=(0.793(0.006),-0.373(0.005)$) mas/yr for NGC 1798. E(B-V) color excesses were derived for NGC 1193 as $0.150(0.037)$ and for NGC 1798 as 0.505(0.100) mag through the use of two-color diagrams. Photometric metallicities are also determined from two-color diagrams with the results of [Fe/H] = -0.30(0.06) dex for NGC 1193 and [Fe/H]=-0.20(0.07) dex for NGC 1798. The isochrone fitting distance and age of NGC 1193 are 5562(381) pc and 4.6(1) Gyr, respectively. For NGC 1798, these parameters are 4451(728) pc and 1.3(0.2) Gyr. These ages indicate that NGC 1193 and NGC 1798 are old open clusters. The overall present-day mass function slopes for main-sequence stars are found as 1.38(2.16) for NGC 1193 and 1.30(0.21) for NGC 1798, which are in fair agreement with the value of Salpeter (1955). Kinematic and dynamic orbital calculations indicate that NGC 1193 and NGC 1798 belong to the thick-disk and thin-disk populations, respectively. In addition, both of the clusters were born outside the solar circle, and both orbit in the metal-poor region of the Galactic disk.

arXiv commentComments: 29 pages, including 13 figures and 4 tables, accepted for publication in the Revista Mexicana de Astronomía y Astrofísica

References in corpus (38)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Structure of Cold Dark Matter Halos
• The Gaia mission
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The USNO-B Catalog
• galpy: A Python Library for Galactic Dynamics
• Painting a portrait of the Galactic disc with its stellar clusters
• UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions
• Chemical composition of 90 F and G disk dwarfs
• Interrelated Main-Sequence Mass-Luminosity, Mass-Radius and Mass-Effective Temperature Relations
• A catalog of newly identified star clusters in GAIA DR2
• The Open Cluster Chemical Abundances and Mapping Survey: IV. Abundances for 128 Open Clusters using SDSS/APOGEE DR16
• Homogeneous photometry VII. Globular clusters in the Gaia era
• Local Stellar Kinematics from RAVE Data: I. Local Standard of Rest
• Two distinct halo populations in the solar neighborhood. III. Evidence from stellar ages and orbital parameters
• The GALAH survey: tracing the Galactic disk with Open Clusters
• On the metallicity of open clusters II. Spectroscopy
• CCD BV survey of 42 open clusters
• The vertical motion history of disk stars throughout the Galaxy
• Open clusters in APOGEE and GALAH: Combining Gaia and ground-based spectroscopic surveys
• Empirical Bolometric Correction Coefficients for Nearby Main-Sequence Stars in Gaia Era
• Exploring the stellar age distribution of the Milky Way Bulge using APOGEE
• The GALAH Survey and Gaia DR2: (Non)existence of five sparse high-latitude open clusters
• A CCD Study of High Latitude Galactic Structure: Testing the Model Parameters
• A RAVE Investigation on Galactic open Clusters I. Radial velocities and metallicities
• An Improved Metallicity Calibration with UBV Photometry
• CCD UBVRI photometry of NGC 6811
• New metallicity calibration down to [Fe/H] = -2.75 dex
• New Neutron-Capture Measurements in 23 Open Clusters. I. The R-Process
• CCD UBV photometry of the open cluster NGC 6819
• Radial velocities and metallicities from infrared Ca II triplet spectroscopy of open clusters: Berkeley 26, Berkeley 70, NGC 1798, and NGC 2266
• CCD BV and 2MASS photometric study of the open cluster NGC 1513
• The age distribution of stars in the Milky Way bulge
• Separation of dwarf and giant stars with ROTSE-IIId
• CCD UBV Photometry and Kinematics of the Open Cluster NGC 225
• A photometric and astrometric study of the open clusters NGC 1664 and NGC 6939
• CCD $UBV(RI{)}_C$ Photometry of Twenty Open Clusters
• UBVI CCD Photometry of the Old Open Cluster NGC 1193

Cited by in corpus (2)

• Study of Open Star Clusters Using the Gaia DR3: I- Poorly Studied King 2 and King 5
• Astrophysical Parameters of the Open Cluster Berkeley 6