Photometric variable stars in the young open cluster NGC 6823
arXiv:2301.02399 · doi:10.1093/mnras/stad013
Abstract
We present stellar variability towards the young open cluster NGC\,6823. Time series - and -band CCD photometry led to identification and characterization of 88 variable stars, of which only 14 have been previously recognized. We ascertain the membership of each variable with optical and infrared photometry, and with Gaia EDR3 parallax and proper motion data. Seventy two variable stars are found to be cluster members, of which 25 are main sequence stars and 48 are pre-main-sequence stars. The probable cluster members collectively suggest an isochrone age of the cluster to be about 2~Myrs based on the GAIA photometry. With the color and magnitude, as well as the shape of the light curve, we have classified the main sequence variables into ~Cep, ~Scuti, slowly pulsating B type, and new class variables. Among the pre-main-sequence variables, eight are classical T Tauri variables, and four are Herbig Ae/Be objects, whereas the remaining belong to the weak-lined T Tauri population. The variable nature of 32 stars is validated with TESS light curves. Our work provides refined classification of variability of pre-main-sequence and main-sequence cluster members of the active star-forming complex, Sharpless\,86. Despite no strong evidence of the disk-locking mechanism in the present sample of TTSs, one TTS with larger is found to be slow rotator.
arXiv comment19 pages, 19 figures, accepted for publication in MNRAS
References in corpus (29)
- The Gaia mission
- The Transiting Exoplanet Survey Satellite
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- Theoretical isochrones in several photometric systems I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington, and ESO Imaging Survey filter sets
- On the use of empirical bolometric corrections for stars
- Spitzer Observations of NGC 1333: A Study of Structure and Evolution in a Nearby Embedded Cluster
- Clusters and mirages: cataloguing stellar aggregates in the Milky Way
- Magnetospheric accretion-ejection processes in the classical T Tauri star AA
- eleanor: An open-source tool for extracting light curves from the TESS Full-Frame Images
- YSOVAR: the first sensitive, wide-area, mid-IR photometric monitoring of the ONC
- Stellar Rotation in M35: Mass-Period Relations, Spin-Down Rates, and Gyrochronology
- A rotational and variability study of a large sample of PMS stars in NGC 2264
- Kepler observations of variability in B-type stars
- Membership and Multiplicity among Very Low-Mass Stars and Brown Dwarfs in the Pleiades Cluster
- The Color-Period Diagram and Stellar Rotational Evolution - New Rotation Period Measurements in the Open Cluster M34
- The Mass Dependence of Stellar Rotation in the Orion Nebula Cluster
- Testing the Disk Regulation Paradigm with Spitzer Observations. II. A Clear Signature of Star-Disk Interaction in NGC 2264 and the Orion Nebula Cluster
- Optical spectroscopy of isolated planetary mass objects in the sigma Orionis cluster
- Stellar clusters in the inner Galaxy and their correlation with cold dust emission
- Stellar Rotation in the Gaia Era: Revised Open Clusters Sequences
- The JCMT Transient Survey: Stochastic and Secular Variability of Protostars and Disks In the Sub-Millimeter Observed Over Eighteen Months
- YSOVAR: Six pre-main-sequence eclipsing binaries in the Orion Nebula Cluster
- New Rotation Periods in the Open Cluster NGC 1039 (M 34), and a Derivation of its Gyrochronology Age
- The Variability and Rotation of Pre-main Sequence Stars in IC 348: Does Intracluster Environment Influence Stellar Rotation?
- Investigating the borderline between a young star cluster and a small stellar association: a test case with Bochum1
- Rotation and magnetic activity evolution of Sun-like stars
- Young Stellar Objects in NGC 6823
- Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei
- Interstellar extinction in twenty open star clusters