Abstract Details

Name: ARUN ROY
Affiliation: CHRIST (Deemed to be University), Bangalore
Conference ID: ASI2021_343
Title : Clustering of low mass YSOs around Herbig Be stars - Case of IL Cep
Authors and Co-Authors : Arun Roy (CHRIST (deemed to be University)), Blesson Mathew (CHRIST (deemed to be University)), Maheshwar Gopinathan (IIA, Bangalore), Tapas Baug (TIFR, Mumbai), P. Manoj (TIFR, Mumbai), Shridharan Baskaran (CHRIST (deemed to be University)), R Anusha (CHRIST (deemed to be University)), Mayank Narang (TIFR, Mumbai)
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : Herbig Ae/Be stars are intermediate mass premain sequence stars with spectral types ranging from B0-F5. The early type Herbig stars are reported to have a clustering of low mass YSOs around them. We use the high precision Gaia EDR3 data to identify the young stars associated with early Herbig stars. The early type Herbig Be star IL Cep is a member of the Cep OB3 association. The ~ 0.1 Myr star at 797 pc and has a "cavity" associated with it. We have identified 78 co-moving stars of IL Cep using the Gaia EDR3 astrometric analysis. The Gaia color-magnitude diagram confirms that the stars are mostly coeval to IL Cep (~ 0.1 Myr). We analyzed the 2MASS and IRAC colors of the co-moving stars and classified 26 stars as Class II objects. The stars without disc (Class III) are 65 % of all the co-moving stars, which is consistent with previous studies. There are 9 intense Hɑ emission stars identified among the co-moving stars using narrowband Hɑ photometry from IPHAS. HD 216658, a B0V type star that occupies the center of the "cavity" is identified as associated with IL Cep co-moving association and the "cavity". The Gaia EDR3 distance confirms that, HD 216658 as the initial trigger in mass dispersal and the creation of a "cavity" in the region. The pressure components of HD 216658 are estimated and found that the star is capable of producing the "cavity". Dendogram analysis on the Hydrogen column density map identified 10 molecular clump structures on the expanding "cavity" around IL Cep making it an actively star-forming region.