MEGASTAR − III. Stellar parameters and data products for DR1 late-type stars
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http://hdl.handle.net/10045/135826
Títol: | MEGASTAR − III. Stellar parameters and data products for DR1 late-type stars |
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Autors: | Mollá, Mercedes | García-Vargas, María Luisa | Millán-Irigoyen, Iker | Cardiel, Nicolás | Carrasco, Esperanza | Gil de Paz, Armando | Berlanas, Sara R. | Gómez-Álvarez, Pedro |
Grups d'investigació o GITE: | Astrofísica Estelar (AE) |
Centre, Departament o Servei: | Universidad de Alicante. Departamento de Física Aplicada |
Paraules clau: | Astronomical data bases: atlases | Astronomical data bases: catalogues | Stars: abundance | Stars: fundamental parameters | Galaxy: stellar content | Galaxies: evolution |
Data de publicació: | 24-de desembre-2022 |
Editor: | Oxford University Press |
Citació bibliogràfica: | Monthly Notices of the Royal Astronomical Society. 2023, 519(4): 5472-5491. https://doi.org/10.1093/mnras/stac3789 |
Resum: | MEGARA (Multi Espectrógrafo en Gran Telescopio Canarias de Alta Resolución para Astronomía) is the optical integral-field and multi-object spectrograph at the Gran Telescopio Canarias. We have created MEGASTAR , an empirical library of stellar spectra obtained using MEGARA at high resolution, R=20000 (full width at half-maximum), available in two wavelength ranges: one centred on Hα, from 6420 to 6790 Å; and the other centred on the Ca ii triplet, from 8370 to 8885 Å (HR-R and HR-I volume phase holographic (VPH)-grating configurations). In this work, we use MEGASTAR spectra, a combination of these two short wavelength intervals, to estimate the stellar parameters, namely the effective temperature, surface gravity, and metallicity (and their associated errors), for a sample of 351 MEGASTAR members with spectral types earlier than B2. We applied a χ2-technique by comparing MEGASTAR data with theoretical stellar models. For those stars with stellar parameters derived in the literature, we obtained a good agreement between the published parameters and ours. In addition to the stellar parameters, we also provide several products, such as the rectified spectra, radial velocities, and stellar indices, for this sample of stars. In the near future, we will use MEGASTAR spectra and their derived stellar parameters to compute stellar population evolutionary synthesis models, which will contribute to a better interpretation of star cluster and galactic spectra obtained with MEGARA. |
Patrocinadors: | This work is part of the grants I+D + i RTI2018-096188-B-I00 and PID2019-107408GB-C41, which have been funded by Ministerio de Ciencia e Innovación and Agencia Estatal de Investigación (MCIN/AEI/10.13039/501100011033). It has been also partially funded by FRACTAL, INAOE and CIEMAT. SRB is grateful for financial support from MCIN/AEI/10.13039/501100011033 (contract FJC 2020-045785-I) and NextGeneration EU/PRTR and MIU (UNI/551/2021) through a Margarita Salas grant. |
URI: | http://hdl.handle.net/10045/135826 |
ISSN: | 0035-8711 (Print) | 1365-2966 (Online) |
DOI: | 10.1093/mnras/stac3789 |
Idioma: | eng |
Tipus: | info:eu-repo/semantics/article |
Drets: | © 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society |
Revisió científica: | si |
Versió de l'editor: | https://doi.org/10.1093/mnras/stac3789 |
Apareix a la col·lecció: | INV - Astrofísica Estelar - Artículos de Revistas |
Arxius per aquest ítem:
Arxiu | Descripció | Tamany | Format | |
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Molla_etal_2023_MNRAS.pdf | 5,01 MB | Adobe PDF | Obrir Vista prèvia | |
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