MEGASTAR (III). Stellar parameters and data products for DR1 late-type stars
arXiv:2212.10971 · doi:10.1093/mnras/stac3789
Abstract
MEGARA 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 (FWHM), available in two wavelength ranges: one centered in H, from 6420 to 6790\,Å and the other centered in the \ion{Ca}{ii} triplet, from 8370 to 8885\,Å (\mbox{HR-R} and \mbox{HR-I} VPH-grating configurations). In this work, we use MEGASTAR spectra, combination of these two short wavelength intervals, to estimate the stellar parameters namely effective temperature, surface gravity and metallicity (and their associated errors) for a sample of 351 MEGASTAR members with spectral types earlier than B2. We have applied a technique by comparing MEGASTAR data to theoretical stellar models. For those stars with stellar parameters derived in the literature, we have obtained a good agreement between those published parameters and ours. Besides the stellar parameters, we also provide several products like the rectified spectra, radial velocities and stellar indices for this sample of stars. In a 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 clusters and galaxies spectra obtained with MEGARA.
20 pages, 14 figures, Monthly Notices of the Royal Astronomical Society (in press)
References in corpus (18)
- A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
- The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
- Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
- The Radial Velocity Experiment (RAVE): first data release
- UV-extended E-MILES stellar population models: young components in massive early-type galaxies
- Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
- The Effects of Stellar Rotation. II. A Comprehensive Set of Starburst99 Models
- Evolutionary stellar population synthesis with MILES - II. Scaled-solar and α-enhanced models
- Modeling the color evolution of luminous red galaxies - improvements with empirical stellar spectra
- Spectral models for solar-scaled and alpha-enhanced stellar populations
- Stellar atmospheric parameters for 754 spectra from the X-shooter Spectral Library
- Pégase.3: A code for modeling the UV-to-IR/submm spectral and chemical evolution of galaxies with dust
- To use or not to use synthetic stellar spectra in population synthesis models?
- Origin of radio-quiet coronal mass ejections in flare stars
- HR-pyPopStar: high wavelength-resolution stellar populations evolutionary synthesis model
- SDSS-IV MaStar: Data-driven Parameter Derivation for the MaStar Stellar Library
- High Resolution Spectral Line Indices Useful for the Analysis of Stellar Populations
- MEGARA-GTC Stellar Spectral Library (II). MEGASTAR First Release