Abstract Details

Name: Shridharan Baskaran
Affiliation: CHRIST(Deemed to be University)
Conference ID: ASI2021_308
Title : Catalog of Hot Emission Line stars from LAMOST DR5
Authors and Co-Authors : Blesson Mathew(CHRIST(Deemed to be University), Nidhi Sabu(CHRIST(Deemed to be University), Anusha Ravikumar(CHRIST(Deemed to be University), Arun Roy(CHRIST(Deemed to be University), Sreeja S Kartha(CHRIST(Deemed to be University), Gourav Banerjee(CHRIST(Deemed to be University), Paul K T(CHRIST(Deemed to be University)
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : We present a catalog of 3340 hot emission-line stars identified from 451,695 OBA- type spectra, provided by the LAMOST DR5 catalog. We developed an automated python routine that identified 5437 spectra having an H-alpha peak between 656.1 and 656.8 nm. False detections and bad spectra were removed, leaving 4139 good emission line spectra of 3340 unique emission-line objects. We re-estimated the spectral type of 3309 spectra as the LAMOST Stellar Parameter Pipeline did not provide accurate spectral types for emission line spectra. Since Herbig Ae/Be stars show higher excess in near-infrared and mid-infrared wavelengths than Classical Be/Ae stars, we used 2MASS and WISE photometry to distinguish them. Finally, we report 1094 Classical Be, 243 Classical Ae, and 58 Herbig Ae/Be stars identified from the LAMOST DR5. 81\% percent of the ELS present in our sample are new detections and were not present in the SIMBAD database. Identification of such a large, homogeneous set of emission-line spectra will help the community study the emission phenomenon in detail without worrying about inherent biases from various sources.