Abstract Details

Name: Piyali Saha
Affiliation: Indian Institute of Astrophysics (IIA)
Conference ID: ASI2020_500
Title : A census of young stellar population associated with the Herbig Be star HD 200775
Authors and Co-Authors : Piyali Saha, Maheswar Gopinathan, Umanath S. Kamath, Chang Won Lee, Manoj Puravankara, Blesson Mathew, Ekta Sharma
Abstract Type : Oral
Abstract Category : Stars, ISM and Galaxy
Abstract : The region surrounding the well-known reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, located in the dark cloud L1174 is studied in this work. Based on the distances and proper motion values from Gaia DR2 of 20 previously known young stellar objects (YSOs), we obtained a distance of 335±11 pc to the cloud complex L1172/1174 to which L1174 is a part. Using polarization measurements of the stars projected on the cloud complex, we show additional evidence for the cloud to be at ∼335 pc distance. Using this distance and proper motion values of the YSO candidates, we searched for additional comoving sources in the vicinity of HD 200775 and found 20 new sources which show low infrared excess emission and are of age ∼1 Myr. Among these, 10 YSO candidates and 4 newly identified comoving sources are found to show X-ray emission. Three of the four new sources for which we have obtained optical spectra show H-alpha in emission. About 80% of the total sources are found within ∼1 pc distance from HD 200775. Spatial correlation of some of the YSO candidates with the Herschel dust column density peaks suggests that star formation is still active in this region and may have been triggered by HD 200775.