Abstract Details

Name: Alik Panja
Affiliation: S. N. Bose National Centre for Basic Sciences
Conference ID: ASI2020_407
Title : Census of young stellar population in the Galactic H II region Sh2-242
Authors and Co-Authors : Alik Panja, Soumen Mondal, Somnath Dutta, Santosh Joshi, Sneh Lata, Ramkrishna Das
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : We present here identification and characterization of the young stellar population associated with an active star-forming site Sh2-242. We used our own new optical imaging and spectroscopic observational data, including several archival catalogs, e.g., Pan-STARRS 1, Gaia DR2, IPHAS, WIRCam, 2MASS, and Spitzer. Slit spectroscopic results manifest the classification of the main ionizing source BD+26 980 as an early-type star of spectral nature B0.5 V. The spectrophotometric distance of the star is estimated as 2.08 ± 0.24 kpc, which confirms the source as a member of the cluster. The extinction map towards the region is generated with H and K photometry using the nearest neighbourhood technique. After removing field star contamination, the average extinction within the region is estimated as Av ∼ 3.1 mag. Using the infrared colour excess, a total of 33 Class I and 137 Class II young objects are classified within the region. The IPHAS photometry reveals classification of 36 Hα emitting sources, which might be class II objects. Among 36 Hα emitting sources, 5 are already identified using infrared excess emission. All total 201 young objects are classified towards S242 from this study. The membership status of the young sources are further windowed with the inclusion of parallax from Gaia DR2 catalog. Using the optical and infrared colour magnitude diagrams, the YSOs are characterized with an average age of ∼ 1 Myr and the masses in the range 0.1 to 3.0 M⊙. The census of stellar content and star formation activity within the region are discussed using combined photometric and spectroscopic data.