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Titolo:
INFRARED-SPECTRA OF LOW-MASS STARS - TOWARD A TEMPERATURE SCALE FOR RED DWARFS
Autore:
LEGGETT SK; ALLARD F; BERRIMAN G; DAHN CC; HAUSCHILDT PH;
Indirizzi:
IRTF HILO,POB 4729 HILO HI 96720 JOINT ASTRON CTR HILO HI 96720 UNIV BRITISH COLUMBIA,DEPT GEOPHYS & ASTRON VANCOUVER BC V6T 1Z4 CANADA GEN SCI CORP LAUREL MD 20707 USN OBSERV FLAGSTAFF AZ 86002 ARIZONA STATE UNIV,DEPT PHYS & ASTRON TEMPE AZ 85287 UNIV HAWAII HILO HI 96720
Titolo Testata:
The Astrophysical journal. Supplement series
fascicolo: 1, volume: 104, anno: 1996,
pagine: 117 - 143
SICI:
0067-0049(1996)104:1<117:IOLS-T>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEARBY M-DWARFS; STANDARD STARS; BROWN DWARFS; LUMINOSITY FUNCTION; ABSOLUTE FLUX; PHOTOMETRY; SEQUENCE; SYSTEM; CALIBRATION; MAGNITUDES;
Keywords:
INFRARED, STARS; STARS, ATMOSPHERES; STARS, FUNDAMENTAL PARAMETERS; STARS, LOW MASS, BROWN DWARFS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
73
Recensione:
Indirizzi per estratti:
Citazione:
S.K. Leggett et al., "INFRARED-SPECTRA OF LOW-MASS STARS - TOWARD A TEMPERATURE SCALE FOR RED DWARFS", The Astrophysical journal. Supplement series, 104(1), 1996, pp. 117-143

Abstract

We present new low-resolution (R similar to 250) 1.0-2.4 mu m spectrafor 13 red dwarf stars. The sample size is increased to 16 by including other published infrared spectra. New, as well as published, red spectra are presented for 10 of these 16 stars, and new and published VRIJHKLL' photometry is also presented. Both halo and disk stars are included in the sample, which covers a range of spectral type from dM0 todM6.5. We derive bolometric luminosities and bolometric corrections from the observational data, finding good agreement with earlier results for the disk stars. We fit synthetic spectra generated by Allard & Hauschildt's state-of-the-art model atmospheres to the observed spectra. Although some discrepancies remain between the theoretical and observed spectra, we find that the molecular features give a consistent value for effective temperature across the entire observed wavelength range. The T-eff values and radii derived, and their dependency on metallicity, are in agreement with the most recent structural models of low-mass stars, removing the long-standing discrepancy between the observed and calculated locations of such stars in the H-R diagram, at least for stars more massive than 0.1 M..

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Documento generato il 18/08/18 alle ore 08:31:50