Abstract Details
| Name: Arun Roy Affiliation: Christ (Deemed to be University), Bengaluru Conference ID: ASI2019_328 Title : Gaia view of Herbig Ae/Be Stars: Estimating the stellar parameters from Gaia DR2 data Authors and Co-Authors : Arun R., Blesson Mathew, Manoj P., Ujjwal K., Mayank Narang, Gayathri Viswanath, Sreeja S. Kartha Abstract Type : Poster Abstract Category : Stars, ISM and Galaxy Abstract : The accurate determination of stellar parameters such as mass, radius, and age of Herbig Ae/Be (HAeBe) stars are critically dependent on the distance to the source. Taking advantage of the latest release of Gaia data, Gaia DR2, we estimated ages and masses of 100 HAeBe stars. The stellar parameters are derived from the Gaia color-magnitude diagram with the help of accurate astrometric and photometric measurements from Gaia DR2 and using MIST isochrones and evolutionary tracks. We derived the mass accretion rates for HAeBe stars using the refined stellar masses and distances, and used it as a tool in investigating the physical properties of the stars and their disk. From the exponential decay of mass accretion rate with stellar age, we estimated disk dissipation timescale of τ = 1.7±0.1 for the full sample of HAeBe stars. We estimated the best fit for mass accretion rate and stellar mass which exhibits a power law as Macc ∝ M☉^(3.4±0.2) for the full sample. We also found a distinct behavior in the infrared spectral index for HBe and HAe stars. |