Emission line star catalogues post- Gaia DR3: A validation of Gaia DR3 data using the LAMOST OBA emission catalogue
- Title
- Emission line star catalogues post- Gaia DR3: A validation of Gaia DR3 data using the LAMOST OBA emission catalogue
- Creator
- Shridharan B.; Mathew B.; Bhattacharyya S.; Robin T.; Arun R.; Kartha S.S.; Manoj P.; Nidhi S.; Maheshwar G.; Paul K.T.; Narang M.; Himanshu T.
- Description
- Aims.Gaia Data Release 3 (DR3) and further releases have the potential to identify and categorise new emission-line stars in the Galaxy. We perform a comprehensive validation of astrophysical parameters from Gaia DR3 with the spectroscopically estimated emission-line star parameters from the LAMOST OBA emission catalogue. Method. We compare different astrophysical parameters provided by Gaia DR3 with those estimated using LAMOST spectra. By using a larger sample of emission-line stars, we performed a global polynomial and piece-wise linear fit to update the empirical relation to convert the Gaia DR3 pseudo-equivalent width to the observed equivalent width, after removing the weak emitters from the analysis. Results. We find that the emission-line source classifications given by DR3 is in reasonable agreement with the classification from the LAMOST OBA emission catalogue. The astrophysical parameters estimated by the esphs module from Gaia DR3 provides a better estimate when compared to gspphot and gspspec. A second degree polynomial relation is provided along with piece-wise linear fit parameters for the equivalent width conversion. We notice that the LAMOST stars with weak H? emission are not identified to be in emission from BP/RP spectra. This suggests that emission-line sources identified by Gaia DR3 are incomplete. In addition, Gaia DR3 provides valuable information about the binary and variable nature of a sample of emission-line stars. 2022 EDP Sciences. All rights reserved.
- Source
- Astronomy and Astrophysics, Vol-668
- Date
- 2022-01-01
- Publisher
- EDP Sciences
- Subject
- Be; Catalogs; Herbig Ae/Be; Methods: data analysis; Stars: emission-line; Stars: variables: T Tauri; Techniques: spectroscopic
- Coverage
- Shridharan B., Department of Physics and Electronics, Christ (Deemed to Be University), Hosur Main Road, Bangalore, India; Mathew B., Department of Physics and Electronics, Christ (Deemed to Be University), Hosur Main Road, Bangalore, India; Bhattacharyya S., Department of Physics and Electronics, Christ (Deemed to Be University), Hosur Main Road, Bangalore, India; Robin T., Department of Physics and Electronics, Christ (Deemed to Be University), Hosur Main Road, Bangalore, India; Arun R., Indian Institute of Astrophysics, Koramangala, Bangalore, India; Kartha S.S., Department of Physics and Electronics, Christ (Deemed to Be University), Hosur Main Road, Bangalore, India; Manoj P., Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, India; Nidhi S., Department of Physics and Electronics, Christ (Deemed to Be University), Hosur Main Road, Bangalore, India; Maheshwar G., Indian Institute of Astrophysics, Koramangala, Bangalore, India; Paul K.T., Department of Physics and Electronics, Christ (Deemed to Be University), Hosur Main Road, Bangalore, India; Narang M., Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, India; Himanshu T., Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, India
- Rights
- All Open Access; Green Open Access; Hybrid Gold Open Access
- Relation
- ISSN: 46361; CODEN: AAEJA
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Shridharan B.; Mathew B.; Bhattacharyya S.; Robin T.; Arun R.; Kartha S.S.; Manoj P.; Nidhi S.; Maheshwar G.; Paul K.T.; Narang M.; Himanshu T., “Emission line star catalogues post- Gaia DR3: A validation of Gaia DR3 data using the LAMOST OBA emission catalogue,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 23, 2025, https://archives.christuniversity.in/items/show/14723.