Photometric variability of the pre-main sequence stars towards the Sh 2-190 region

Abstract

We present the results from our time-series imaging data taken with the 1.3m Devasthal fast optical telescope and 0.81m Tenagara telescope in $V$, $R_c$, $I_c$ bands covering an area of $\sim 18^{\prime }.4\times 18^{\prime }.4$ towards the star-forming region Sh 2-190. This photometric data helped us to explore the nature of the variability of pre-main sequence (PMS) stars. We have identified 85 PMS variables, i.e., 37 Class II and 48 Class III sources. Forty-five of the PMS variables are showing periodicity in their light curves. We show that the stars with thicker discs and envelopes rotate slower and exhibit larger photometric variations compared to their disc-less counterparts. This result suggests that rotation of the PMS stars is regulated by the presence of circumstellar discs. We also found that the period of the stars show a decreasing trend with increasing mass in the range of $\sim$0.5-2.5 M${}_{\odot }$. Our result indicates that most of the variability in Class II sources is ascribed to the presence of thick disc, while the presence of cool spots on the stellar surface causes the brightness variation in Class III sources. X-ray activities in the PMS stars were found to be at the saturation level reported for the main sequence (MS) stars. The younger counterparts of the PMS variables are showing less X-ray activity hinting towards a less significant role of a stellar disc in X-ray generation.

arXiv commentAccepted for publication in ApJ

References in corpus (61)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Spitzer Space Telescope Mission
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• Disk Frequencies and Lifetimes in Young Clusters
• Evolution of asymptotic giant branch stars II. Optical to far-infrared isochrones with improved TP-AGB models
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• Interpreting Spectral Energy Distributions from Young Stellar Objects. II. Fitting observed SEDs using a large grid of pre-computed models
• Interpreting Spectral Energy Distributions from Young Stellar Objects. I. A grid of 200,000 YSO model SEDs
• The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy
• The Origin of T Tauri X-ray Emission: New Insights from the Chandra Orion Ultradeep Project
• 2-D Radiative Transfer in Protostellar Envelopes: I. Effects of Geometry on Class I Sources
• 2-D Radiative Transfer in Protostellar Envelopes: II. An Evolutionary Sequence
• PAHs as a tracer of star formation?
• CSI 2264: Simultaneous optical and infrared light curves of young disk-bearing stars in NGC 2264 with CoRoT and Spitzer-- evidence for multiple origins of variability
• Magnetospheric accretion-ejection processes in the classical T Tauri star AA
• Infrared L Band Observations of the Trapezium Cluster: A Census of Circumstellar Disks and Candidate Protostars
• Can we predict the global magnetic topology of a pre-main sequence star from its position in the Hertzsprung-Russell diagram?
• A rotational and variability study of a large sample of PMS stars in NGC 2264
• Accretion dynamics and disk evolution in NGC 2264: a study based on the Corot photometric observations
• A Multi-Ringed, Modestly-Inclined Protoplanetary Disk around AA Tau
• Results of the ROTOR-program. II. The long-term photometric variability of weak-line T Tauri stars
• A Correlation Between Pre-Main Sequence Stellar Rotation Rates and IRAC Excesses in Orion
• CSI 2264: Probing the inner disks of AA Tau-like systems in NGC 2264
• AA Tau's sudden and long-lasting deepening: enhanced extinction by its circumstellar disk
• The Massive Star-forming Regions Omnibus X-ray Catalog
• CSI 2264: Investigating rotation and its connection with disk accretion in the young open cluster NGC 2264
• Precision photometric monitoring of very low mass Sigma Orionis cluster members: variability and rotation at a few Myr
• Photometric variability of the T Tauri star TW Hya on time scales of hours to years
• X-ray Properties of Pre--Main-Sequence Stars in the Orion Nebula Cluster with Known Rotation Periods
• Rotation in NGC 2264: a study based on CoRoT photometric observations
• Time-Series Photometry of Stars in and around the Lagoon Nebula. I. Rotation Periods of 290 Low-Mass Pre-Main-Sequence Stars in NGC 6530
• Rotational studies in the Orion Nebula Cluster: from solar mass stars to brown dwarfs
• Triggered Star Formation and Evolution of T-Tauri stars in and around Bright-Rimmed Clouds
• A Variability Study of Pre-Main Sequence Stars in the Extremely Young Cluster IC 348
• Do accretion discs regulate the rotation of young stars?
• Periodic and Aperoidic Variability in the Molecular Cloud ρOphiuchus
• Rotation of young stars in Cepheus OB3b
• Young stellar population and ongoing star formation in the HII complex Sh2-252
• The stellar contents and star formation in the NGC 7538 region
• Young Stellar Population of the Bright-Rimmed Clouds BRC 5, BRC 7 and BRC 39
• Classifying the embedded young stellar population in Perseus and Taurus & the LOMASS database
• Star Formation and Young Population of the HII Complex Sh2-294
• The disintegrating old open cluster Czernik 3
• An Optical and Infrared Photometric Study of the Young Open Cluster IC 1805 in the Giant H II Region W4
• Stellar cores in the Sh 2-305 H II region
• Low-mass young stellar population and star formation history of the cluster IC 1805 in the W4 H{\sc ii} region
• Analysis of variability of TW Hya as observed by MOST and ASAS in 2009
• Star-disk interactions in multi-band photometric monitoring of the classical T Tauri star GI Tau
• X-ray activity and rotation of the young stars in IC 348
• Pre-main sequence variable stars in young open cluster NGC 1893
• Unveiling the physical conditions in NGC 6910
• Variable stars in young open star cluster NGC 7380
• Variability of young stellar objects in the star-forming region Pelican Nebula
• Rotation-disk connection for very low mass and substellar objects in the Orion Nebula Cluster
• Near-Infrared Time-Series Photometry in the Field of Cygnus OB2 Association I - Rotational Scenario For Candidate Members
• Photometric variability of massive young stellar objects. I
• Photometric search for variable stars in young open cluster Berkeley 59
• Testing the Disk-Locking Paradigm: An Association Between U-V Excess and Rotation in NGC 2264
• Variable stars in the Sh 2-170 HII region
• Long-Term Photometry of IC 348 with the YETI Network
• NGC 1893: a young open cluster rich in multi-type variable stars