Mg and TiO spectral features at the near-IR: spectrophotometric index definitions and empirical calibrations
| dc.contributor.author | Cenarro, A. J. | |
| dc.contributor.author | Cardiel López, Nicolás | |
| dc.contributor.author | Vazdekis, A. | |
| dc.contributor.author | Gorgas García, Francisco Javier | |
| dc.date.accessioned | 2023-06-20T03:47:36Z | |
| dc.date.available | 2023-06-20T03:47:36Z | |
| dc.date.issued | 2009-07-11 | |
| dc.description | This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. © 2009 The Authors. Journal compilation. © 2009 RAS. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. We acknowledge an anonymous referee for his/her very useful comments. AJC is a Juan de la Cierva Fellow of the Spanish Ministry of Science and Innovation. This work has been funded by the Spanish Ministry of Science and Innovation through grants AYA2007-67752-C03-01 and AYA2006-15698-C02-02. | |
| dc.description.abstract | Using the near-infrared spectral stellar library of Cenarro et al., the behaviour of the Mg i line at 8807 A and nearby TiO bands is analyzed in terms of the effective temperature, surface gravity and metallicity of the library stars. New spectroscopic indices for both spectral features - namely MgI and sTiO - are defined, and their sensitivities to different signal-to-noise ratios, spectral resolutions, flux calibrations and sky emission-line residuals are characterized. The two new indices exhibit interesting properties. In particular, MgI is a good indicator of the Mg abundance, whereas sTiO is a powerful dwarf-to-giant discriminator for cold spectral types. Empirical fitting polynomials that reproduce the strength of the new indices as a function of the stellar atmospheric parameters are computed, and a fortran routine with the fitting function predictions is made available. A thorough study of several error sources, non-solar [Mg/Fe] ratios and their influence on the fitting function residuals is also presented. From this analysis, an [Mg/Fe] underabundance of similar to -0.04 is derived for the Galactic open cluster M67. | |
| dc.description.department | Depto. de Física de la Tierra y Astrofísica | |
| dc.description.faculty | Fac. de Ciencias Físicas | |
| dc.description.refereed | TRUE | |
| dc.description.sponsorship | Spanish Ministry of Science and Innovation | |
| dc.description.status | pub | |
| dc.eprint.id | https://eprints.ucm.es/id/eprint/28028 | |
| dc.identifier.doi | 10.1111/j.1365-2966.2009.14839.x | |
| dc.identifier.issn | 0035-8711 | |
| dc.identifier.officialurl | http://dx.doi.org/10.1111/j.1365-2966.2009.14839.x | |
| dc.identifier.relatedurl | http://mnras.oxfordjournals.org/ | |
| dc.identifier.uri | https://hdl.handle.net/20.500.14352/44452 | |
| dc.issue.number | 4 | |
| dc.journal.title | Monthly notices of the Royal Astronomical Society | |
| dc.language.iso | eng | |
| dc.page.final | 1914 | |
| dc.page.initial | 1895 | |
| dc.publisher | Wiley | |
| dc.relation.projectID | AYA2007-67752-C03-01 | |
| dc.relation.projectID | AYA2006-15698-C02-02 | |
| dc.rights.accessRights | open access | |
| dc.subject.cdu | 52 | |
| dc.subject.keyword | Infrared caii triplet | |
| dc.subject.keyword | Stellar atmospheric parameters | |
| dc.subject.keyword | Evolutionary population synthesis | |
| dc.subject.keyword | Resolution galactic spectra | |
| dc.subject.keyword | Newton-telescope library | |
| dc.subject.keyword | Star-formation histories | |
| dc.subject.keyword | Maximum a-posteriori | |
| dc.subject.keyword | Digital sky survey | |
| dc.subject.keyword | Old open clusters | |
| dc.subject.keyword | Elliptic galaxies | |
| dc.subject.ucm | Astrofísica | |
| dc.subject.ucm | Astronomía (Física) | |
| dc.subject.ucm | Física atmosférica | |
| dc.subject.unesco | 2501 Ciencias de la Atmósfera | |
| dc.title | Mg and TiO spectral features at the near-IR: spectrophotometric index definitions and empirical calibrations | |
| dc.type | journal article | |
| dc.volume.number | 396 | |
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