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Titolo:
KELU-1 - A FREE-FLOATING BROWN DWARF IN THE SOLAR NEIGHBORHOOD
Autore:
RUIZ MT; LEGGETT SK; ALLARD F;
Indirizzi:
UNIV CHILE,DEPT ASTRON,CASILLA 36-D SANTIAGO CHILE JOINT ASTRON CTR HILO HI 96720 WICHITA STATE UNIV,DEPT PHYS WICHITA KS 67260
Titolo Testata:
The Astrophysical journal
fascicolo: 2, volume: 491, anno: 1997,
parte:, 2
pagine: 107 - 110
SICI:
0004-637X(1997)491:2<107:K-AFBD>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
ESO AREA-207; AREA-439;
Keywords:
STARS, ATMOSPHERES; STARS, FUNDAMENTAL PARAMETERS; STARS, LOW-MASS, BROWN DWARFS;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
M.T. Ruiz et al., "KELU-1 - A FREE-FLOATING BROWN DWARF IN THE SOLAR NEIGHBORHOOD", The Astrophysical journal, 491(2), 1997, pp. 107-110

Abstract

We present the discovery of a field brown dwarf, Kelu-1. The object has a peculiar optical spectrum that, in spite of its extremely red color, shows no sign of the TiO and VO absorption bands typical of cool, low-mass stars. The optical spectrum does show the Li I lambda 6708 absorption line and Ha in emission. The infrared spectrum of Kelu-1 has strong H2O absorption and also shows the effect of pressure-induced H-2 opacity. Kelu-1 was discovered through its large proper motion of 0 ''.35 yr(-1), with position angle theta = 265 degrees. A distance of similar to 10 pc is estimated astrometrically for the object, which implies absolute magnitudes of M-V similar to 22 and M-K similar to 12. Comparison of the observed energy distribution of Kelu-1 to synthetic spectra generated by atmosphere models of Allard et al., and structuraland evolutionary models of Chabrier & Baraffe, implies that the object has T-eff = 1900 +/- 100 K and a mass below 0.075 M/M..

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Documento generato il 25/05/18 alle ore 09:00:57