VI/125 Theoretical spectra of red giants and supergiants (Lancon+, 2007) ================================================================================ Near-IR spectra of red supergiants and giants. I- Models with solar and with mixing-induced surface abundance ratios. Lancon A., Hauschildt P.H., Ladjal D., Mouhcine M. =2007A&A...468..205L ================================================================================ ADC_Keywords: Stars, giant ; Stars, supergiant ; Spectra, infrared ; Models Keywords: stars: fundamental parameters - stars: abundances - infrared: stars - stars: atmospheres Abstract: It remains difficult to interpret the near-IR emission of young stellar populations. One main reason is our incomplete understanding of the spectra of luminous red stars. This work provides a grid of theoretical spectra of red giant (RG) and red supergiant (RSG) stars, that extends through optical and near-IR wavelengths. For the first time, models are also provided with modified surface abundances of C, N and O, as a step towards accounting for the changes that occur due to convective dredge-up in red supergiants or may occur at earlier evolutionary stages in the case of rotation. The aims are (i) to assess how well current models reproduce observed spectra, in particular in the near-IR; (ii) to quantify the effects of the abundance changes on the spectra; and (iii) to determine how these changes affect estimates of fundamental stellar parameters. Description: Each FITS file in this directory contains a theoretical stellar spectrum. The spherical model atmospheres and the synthetic spectra were computed with PHOENIX version 13.11.00B as described in the article, with an initial wavelength sampling step of 0.01nm in the wavelength range of interest [510nm-2490nm]. The spectra made available here have been smoothed with a Gaussian with a full width at half maximum of 0.2nm. They are resampled with a wavelength step of 0.025nm. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 56 403 List of the spectra m15rsg/* . 142 RSG-specific abundances, M=15M_{sun}_ model spectra m15solar/* . 140 Solar abundances, M=15M_{sun}_ model spectra m1solar/* . 121 Solar abundances, M=1M_{sun}_ model spectra -------------------------------------------------------------------------------- Description of files: Fundamental model parameters can be extracted from the filename and are repeated in self-explanatory header keywords. * lteTTgpG.GmMM_solar.fits lteTTgpG.GmMM_RSG.fits contains the spectrum for a star of mass MM (in solar masses), of effective temperature TT*100 (in Kelvin), and of log(g) G.G (in cm/s^2^), computed with solar (left) or with RSG-specific (right) abundances. * lteTTgmG.GmMM_solar.fits lteTTgmG.GmMM_RSG.fits contains the spectrum with parameters as above except that log(g) is -G.G (in cm/s^2^). The header keyword BUNIT recalls the flux units : erg/s/cm^2^/cm. Summary of the models provided : M = 1 M(sun), solar abundances : Teff in [2900K-5900K] in steps of 100K log(g) in {-1,-0.5,0,1,2} M = 15 M(sun), solar abundances : Teff in [2900K-5900K] in steps of 100K log(g) in {-1,-0.5,0,1,2} M = 15 M(sun), RSG-specific abundances : Teff in [2900K-5900K] in steps of 100K log(g) in {-1,-0.5,0,1,2} See also: III/196 : Near-IR stellar spectra from 1.428 to 2.5 um (Lancon+ 1996) J/A+AS/146/217 : Library of 0.5-2um spectra of Cool Stars (Lancon+ 2000) J/A+A/393/167 : Mean Spectra for upper AGB stars (Lancon+, 2002) J/A+A/405/531 : IR spectra of ISOGAL sources in Bulge (Schultheis+ 2003) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- Model Model (m15rsg, m15solar or m1solar) 10- 11 I2 solMass Mass Mass 13- 16 I4 K Teff Effective temperature 18- 21 F4.1 [cm/s2] logg Surface gravity 24- 56 A33 --- FileName Name of the fits file -------------------------------------------------------------------------------- Acknowledgements: Ariane Lancon, ariane.lancon(at)astro.u-strasbg.fr ================================================================================ (End) Ariane Lancon [Observatoire de Strasbourg] 13-Feb-2007