Infrared measurements of metal-poor subdwarfs and a comparison with model atmospheres

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Publications of the Astronomical Society of the Pacific; (USA)

DOI:https://doi.org/10.1086/132585· OSTI ID:7163903

Elias, J H; Bell, R; Matthews, K; Neugebauer, G ^[1]

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1. Palomar Observatory, Pasadena, CA (USA) Observatorio Interamericano de Cerro Tololo, La Serena (Chile) Maryland Univ., College Park (USA)

Infrared observations of four metal-poor subdwarfs have been compared with the predictions of model stellar atmospheres. The parameters of the models were established by fitting observed and calculated spectral energy distributions at visible wavelengths. The models were used to calculate J, H, K, and L-prime apparent magnitudes for the subdwarfs. When compared with observation, it was fount that, while the subdwarf models were internally consistent at the 1-percent level of better, there are systematic deviations relative to Vega in excess of 0.1 mag. These effects are far greater than would be expected from the excellent fits of the models, for both Vega and the subdwarfs, at shorter wavelengths. Various explanations are suggested for this effect. 24 refs.

• OSTI ID: 7163903
• Journal Information: Publications of the Astronomical Society of the Pacific; (USA), Vol. 101; ISSN 0004-6280
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DWARF STARS
INFRARED RADIATION
CHEMICAL COMPOSITION
ENERGY SPECTRA
FLUX DENSITY
STAR MODELS
STELLAR ATMOSPHERES
VISIBLE SPECTRA
ATMOSPHERES
ELECTROMAGNETIC RADIATION
MATHEMATICAL MODELS
RADIATIONS
SPECTRA
STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources