Clustering of low mass stars around Herbig Be star IL Cep -- Evidence of "Rocket Effect" using Gaia EDR3 ?

Abstract

We study the formation and the kinematic evolution of the early type Herbig Be star IL Cep and its environment. The young star is a member of the Cep OB3 association, at a distance of 798$\pm$9 pc, and has a "cavity" associated with it. We found that the B0V star HD 216658, which is astrometrically associated with IL Cep, is at the center of the cavity. From the evaluation of various pressure components created by HD 216658, it is established that the star is capable of creating the cavity. We identified 79 co-moving stars of IL Cep at 2 pc radius from the analysis of {\textit Gaia} EDR3 astrometry. The transverse velocity analysis of the co-moving stars shows that they belong to two different populations associated with IL Cep and HD 216658, respectively. Further analysis confirms that all the stars in the IL Cep population are mostly coeval ($\sim$ 0.1 Myr). Infrared photometry revealed that there are 26 Class II objects among the co-moving stars. The stars without circumstellar disk (Class III) are 65\% of all the co-moving stars. There are 9 intense H$\alpha$ emission candidates identified among the co-moving stars using IPHAS H$\alpha$ narrow-band photometry. The dendrogram analysis on the Hydrogen column density map identified 11 molecular clump structures on the expanding cavity around IL Cep, making it an active star-forming region. The formation of the IL Cep stellar group due to the "rocket effect" by HD 216658 is discussed.

16 pages,5 tables, 13 figures, accepted for publication in MNRAS

References in corpus (20)

• Theory of Star Formation
• Gaia Early Data Release 3: The astrometric solution
• Gaia Early Data Release 3: Photometric content and validation
• Spitzer Observations of NGC 1333: A Study of Structure and Evolution in a Nearby Embedded Cluster
• Gaia Early Data Release 3 -- Catalogue validation
• Hunting for open clusters in \textit{Gaia} DR2: $582$ new OCs in the Galactic disc
• Vetting of 384 TESS Objects of Interest with TRICERATOPS and Statistical Validation of 12 Planet Candidates
• The dangers of being trigger--happy
• Smoothed Particle Hydrodynamics simulations of expanding HII regions. I. Numerical methods and tests
• Exploring the age dependent properties of M and L dwarfs using Gaia and SDSS
• Protostellar Outflows and Radiative Feedback from Massive Stars
• On the mass accretion rate and infrared excess in Herbig Ae/Be Stars
• Gaia Stellar Kinematics in the Head of the Orion A Cloud: Runaway Stellar Groups and Gravitational Infall
• Star formation in 'the Brick': ALMA reveals an active proto-cluster in the Galactic centre cloud G0.253+0.016
• The ionizing radiation from massive stars and its impact on HII regions: results from modern model atmospheres
• Molecular clumps and star formation associated with the infrared dust bubble N131
• Identification of new Classical Ae stars in the Galaxy using LAMOST DR5
• Multiwavelength study of the infrared dust bubble S51
• A census of young stellar population associated with the Herbig Be star HD 200775
• Accretion disks around young stars: the cradles of planet formation

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