NSCC-A NEW SCHEME OF CLASSIFICATION OF C-RICH STARS DEVISED FROM OPTICAL AND INFRARED OBSERVATIONS

Journal Article · Tue Nov 10 00:00:00 EST 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/705/2/1298· OSTI ID:21378333

De Mello, A B; De Araujo, F X; Pereira, C Bastos; Landaberry, S J. Codina ^[1]; Lorenz-Martins, S ^[2]

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1. Observatorio Nacional-MCT (Brazil)
2. Observatorio do Valongo, Universidade Federal do Rio de Janeiro (Brazil)

A new classification system for carbon-rich stars is presented based on an analysis of 51 asymptotic giant branch carbon stars through the most relevant classifying indices available. The extension incorporated, which also represents the major advantage of this new system, is the combination of the usual optical indices that describe the photospheres of the objects, with new infrared ones, which allow an interpretation of the circumstellar environment of the carbon-rich stars. This new system is presented with the usual spectral subclasses and C{sub 2}-, j-, MS-, and temperature indices, and also with the new SiC- (SiC/C.A. abundance estimation) and tau- (opacity) indices. The values for the infrared indices were carried out through a Monte Carlo simulation of the radiative transfer in the circumstellar envelopes of the stars. The full set of indices, when applied to our sample, resulted in a more efficient system of classification, since an examination in a wide spectral range allows us to obtain a complete scenario for carbon stars.

• OSTI ID: 21378333
• Journal Information: Astrophysical Journal, Vol. 705, Issue 2; Other Information: DOI: 10.1088/0004-637X/705/2/1298; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABUNDANCE
ASYMPTOTIC SOLUTIONS
CARBON
CARBON STARS
CATALOGS
CLASSIFICATION
COMPUTERIZED SIMULATION
MONTE CARLO METHOD
OPACITY
PHOTOSPHERE
RADIANT HEAT TRANSFER
SILICON CARBIDES
ATMOSPHERES
CALCULATION METHODS
CARBIDES
CARBON COMPOUNDS
DOCUMENT TYPES
ELEMENTS
ENERGY TRANSFER
HEAT TRANSFER
MAIN SEQUENCE STARS
MATHEMATICAL SOLUTIONS
NONMETALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SILICON COMPOUNDS
SIMULATION
SOLAR ATMOSPHERE
STARS
STELLAR ATMOSPHERES