Carbon stars in the X-shooter Spectral Library

Abstract

We provide a new collection of spectra of 35 carbon stars obtained with the ESO/VLT X-shooter instrument as part of the X-shooter Spectral Library project. The spectra extend from 0.3$\mu$m to 2.4$\mu$m with a resolving power above $\sim$ 8000. The sample contains stars with a broad range of (J-K) color and pulsation properties located in the Milky Way and the Magellanic Clouds. We show that the distribution of spectral properties of carbon stars at a given (J-K) color becomes bimodal (in our sample) when (J-K) is larger than about 1.5. We describe the two families of spectra that emerge, characterized by the presence or absence of the absorption feature at 1.53$\mu$m, generally associated with HCN and C${}_2$H${}_2$. This feature appears essentially only in large-amplitude variables, though not in all observations. Associated spectral signatures that we interpret as the result of veiling by circumstellar matter, indicate that the 1.53$\mu$m feature might point to episodes of dust production in carbon-rich Miras.

arXiv comment29 pages, 21 figures, 9 tables, Accepted for publication in A&A

References in corpus (52)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Evolutionary population synthesis: models, analysis of the ingredients and application to high-z galaxies
• Evolution of asymptotic giant branch stars II. Optical to far-infrared isochrones with improved TP-AGB models
• X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
• Spectral Irradiance Calibration in the Infrared. XIV: the Absolute Calibration of 2MASS
• The Infrared Telescope Facility (IRTF) Spectral Library: Cool Stars
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• Evolution of asymptotic giant branch stars I. Updated synthetic TP-AGB models and their basic calibration
• An empirical formula for the mass-loss rates of dust-enshrouded red supergiants and oxygen-rich Asymptotic Giant Branch stars
• Evolution of Thermally Pulsing Asymptotic Giant Branch Stars I. The COLIBRI Code
• An atmospheric radiation model for Cerro Paranal. I. The optical spectral range
• Age Determination of Six Intermediate-age SMC Star Clusters with HST/ACS
• Stellar Populations in the Large Magellanic Cloud from 2MASS
• An advanced scattered moonlight model for Cerro Paranal
• Near-Infrared Photometry of Carbon Stars
• Synthetic photometry for carbon rich giants, I. Hydrostatic dust-free models
• The temperatures of Red Supergiants
• Orbital periods of twenty two subdwarf B stars
• New Asymptotic Giant Branch models for a range of metallicities
• The Spectral Energy Distribution of Post-Starburst Galaxies in the NEWFIRM Medium-Band Survey: A Low Contribution from TP-AGB Stars
• The stellar content of the Hamburg/ESO survey. II. A large, homogeneously-selected sample of high latitude carbon stars
• A Spitzer mid-infrared spectral survey of mass-losing carbon stars in the Large Magellanic Cloud
• The X-shooter Spectral Library (XSL): I. DR1. Near-ultraviolet through optical spectra from the first year of the survey
• Near Infrared spectroscopy of post-starburst galaxies: a limited impact of TP-AGB stars on galaxy SEDs
• Flux calibration of medium-resolution spectra from 300 nm to 2500 nm: Model reference spectra and telluric correction
• The EPOCH Project: I. Periodic variable stars in the EROS-2 LMC database
• Mid-infrared spectroscopy of carbon stars in the Small Magellanic Cloud
• The Contribution of TP-AGB and RHeB Stars to the Near-IR Luminosity of Local Galaxies: Implications for Stellar Mass Measurements of High Redshift Galaxies
• The Modelling of Intermediate Age Stellar Populations. II. Average spectra for upper AGB stars, and their use
• AGB Stars in the Fornax Dwarf Spheroidal Galaxy
• The modelling of intermediate-age stellar populations: I- near-infrared properties
• The evolution of the V-K colours of single stellar populations
• Synthetic photometry for carbon-rich giants. IV. An extensive grid of dynamic atmosphere and wind models
• Near-IR Spectra of Red Supergiants and Giants. I- Models with Solar and with Mixing-Induced Surface Abundance Ratios
• Globular Clusters in the Magellanic Clouds.II: IR-Array Photometry for 12 Globulars and Contributions to the Integrated Cluster Light
• Long Period Variables detected by ISO in the SMC
• Carbon star populations in systems with different metallicities: statistics in Local Group galaxies
• Is there a metallicity ceiling to form carbon stars? - A novel technique reveals a scarcity of C stars in the inner M31 disk
• Atmospheric dynamics in carbon-rich Miras. I. Model atmospheres and synthetic line profiles
• The Stellar Populations of Starburst Galaxies Through near infrared spectroscopy
• Synthetic photometry for carbon-rich giants II. The effects of pulsation and circumstellar dust
• Searches for Metal-Poor Stars from the Hamburg/ESO Survey using the CH G-band
• The insidious boosting of TP-AGB stars in intermediate-age Magellanic Cloud clusters
• The CH fraction of Carbon stars at high Galactic latitudes
• Synthetic photometry for carbon-rich giants. III. Tracing the sequence of mass-losing galactic C-type Miras
• [O/Fe] Estimates for Carbon-Enhanced Metal-Poor Stars from Near-IR Spectroscopy
• Integrated J- and H-band spectra of globular clusters in the LMC: implications for stellar population models and galaxy age dating
• Integrated K-band spectra of old and intermediate-age globular clusters in the Large Magellanic Cloud
• A Spitzer/IRAC Characterization of Galactic AGB and RSG Stars
• Near-infrared spectroscopy of AGB star candidates in Fornax, Sculptor and NGC 6822
• Galaxies M32 and NGC 5102 Confirm a Near-infrared Spectroscopic Chronometer
• First spectroscopic evidence for carbon stars outside the Local Group: properties of a massive star cluster in NGC 7252

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• The X-Shooter Spectral Library (XSL): Data Release 2
• Stellar atmospheric parameters for 754 spectra from the X-shooter Spectral Library
• Comparison of Stellar Population Model Predictions Using Optical and Infrared Spectroscopy
• Modelling simple stellar populations in the near-ultraviolet to near-infrared with the X-shooter Spectral Library (XSL)
• Reconnaissance with JWST of the J-region Asymptotic Giant Branch in Distance Ladder Galaxies: From Irregular Luminosity Functions to Approximation of the Hubble Constant
• The Gaia-ESO Survey: Carbon abundance in the Galactic thin and thick disks
• sMILES: A Library of Semi-Empirical MILES Stellar Spectra with Variable [$\alpha$/Fe] Abundances
• Hunting for C-rich long-period variable stars in the Milky Way's bar-bulge using unsupervised classification of Gaia BP/RP spectra
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• Carbon stars with increased oxygen and nitrogen abundances: hydrostatic dust-free model atmospheres
• Gaia-ESO Survey: INTRIGOSS - A new library of High Resolution Synthetic Spectra
• Infrared Properties of Asymptotic Giant Branch Stars in Our Galaxy and the Magellanic Clouds
• Near Infrared spectroscopic indices for unresolved stellar populations. I. Template galaxy spectra
• The MUSE-Faint survey: I. Spectroscopic evidence for a star cluster in Eridanus 2 and constraints on MACHOs as a constituent of dark matter
• Spectral characterization of young LT dwarfs
• Modelling of integrated-light spectra from the optical to the near-infrared: the globular cluster G280 in M31
• Synthetic photometry for carbon-rich giants. V. Effects of grain-size-dependent dust opacities
• Caveats about measuring carbon abundances in stars using the CH band
• From gas to stars: MUSEings on the internal evolution of IC 1613
• Changing CO Bands in Near-IR Spectra of CP Cephei
• Near-IR CO and CN in classical Cepheids
• Near-infrared Integral-field Spectroscopy of the Wind Forming Region of CW Leo
• Carbon stars in the X-Shooter Spectral Library: II. Comparison with models