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Titolo:
Spectra of carbon-rich asymptotic giant branch stars between 0.5 and 2.5 mu m: Theory meets observation
Autore:
Loidl, R; Lacon, A; Jorgensen, UG;
Indirizzi:
Univ Vienna, Inst Astron, A-1180 Vienna, Austria Univ Vienna Vienna Austria A-1180 a, Inst Astron, A-1180 Vienna, Austria Observ Strasburg, UMR 7550, F-67000 Strasbourg, France Observ Strasburg Strasbourg France F-67000 0, F-67000 Strasbourg, France Niels Bohr Inst, Inst Astron, DK-2100 Copenhagen, Denmark Niels Bohr InstCopenhagen Denmark DK-2100 , DK-2100 Copenhagen, Denmark
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 371, anno: 2001,
pagine: 1065 - 1077
SICI:
1432-0746(200106)371:3<1065:SOCAGB>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
MODEL ATMOSPHERES; SEMIREGULAR VARIABLES; ENERGY-DISTRIBUTIONS; STELLAR ATMOSPHERES; INFRARED-SPECTRUM; SC STARS; ABUNDANCES; INTENSITIES; MICRONS; RATIOS;
Keywords:
stars : AGB and post-AGB stars : atmospheres; stars : variables; stars : carbon; radiative transfer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Loidl, R Univ Vienna, Inst Astron, Turkenschanzstr 17, A-1180 Vienna, Austria Univ Vienna Turkenschanzstr 17 Vienna Austria A-1180 na, Austria
Citazione:
R. Loidl et al., "Spectra of carbon-rich asymptotic giant branch stars between 0.5 and 2.5 mu m: Theory meets observation", ASTRON ASTR, 371(3), 2001, pp. 1065-1077

Abstract

We present a hydrostatic analysis of five carbon rich stars, BH Cru, T Cae, S Cen, RU Pup and Y Hya in the wavelength range between 0.5 and 2.5 mum. All except BH Cru, which is a Mira star, show only modest variability. We identify the absorption features of the molecules CO, CN and C-2. The overall energy distribution, which is very sensitive to the effective temperaturein the investigated wavelength range, as well as the bands of these molecules put strict limits on the possible values of effective temperature and C/O. We show that our model atmospheres and corresponding synthetic spectra are able to reproduce the observed spectra quite accurately from about 0.7 to 2.5 mum. The discrepancies are mainly due to uncertainties in the molecular input data. We discuss briefly why the variations of the molecular features are small and why dynamic phenomena do not play a very important role in this wavelength range. We identify colour indices based on commonly available filters and potentially suitable for the empirical determination of fundamental parameters of carbon stars.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 13:16:07