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Titolo:
Infrared observations and modeling of one of the coolest T dwarfs: Gliese 570D
Autore:
Geballe, TR; Saumon, D; Leggett, SK; Knapp, GR; Marley, MS; Lodders, K;
Indirizzi:
Gemini Observ, Hilo, HI 96720 USA Gemini Observ Hilo HI USA 96720Gemini Observ, Hilo, HI 96720 USA Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA Vanderbilt Univ Nashville TN USA 37235 & Astron, Nashville, TN 37235 USA Joint Astron Ctr, Hilo, HI 96720 USA Joint Astron Ctr Hilo HI USA 96720Joint Astron Ctr, Hilo, HI 96720 USA Princeton Univ Observ, Princeton, NJ 08544 USA Princeton Univ Observ Princeton NJ USA 08544 erv, Princeton, NJ 08544 USA NASA, Ames Res Ctr, Moffett Field, CA 94035 USA NASA Moffett Field CA USA94035 Ames Res Ctr, Moffett Field, CA 94035 USA New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA New Mexico State Univ Las Cruces NM USA 88003 n, Las Cruces, NM 88003 USA Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA Washington Univ St Louis MO USA 63130 anetary Sci, St Louis, MO 63130 USA
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 1, volume: 556, anno: 2001,
parte:, 1
pagine: 373 - 379
SICI:
0004-637X(20010720)556:1<373:IOAMOO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIGITAL SKY SURVEY; BROWN DWARF; CHROMOSPHERIC EMISSION; MULTIPLE-SCATTERING; STARS; ATMOSPHERES; ABUNDANCES; DISCOVERY; METHANE; 229B;
Keywords:
stars : abundances; stars : atmospheres; stars : individual (Gliese 570D); stars : low-mass, brown dwarfs;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Geballe, TR Gemini Observ, 670 N Aohoku Pl, Hilo, HI 96720 USA Gemini Observ 670 N Aohoku Pl Hilo HI USA 96720 , HI 96720 USA
Citazione:
T.R. Geballe et al., "Infrared observations and modeling of one of the coolest T dwarfs: Gliese 570D", ASTROPHYS J, 556(1), 2001, pp. 373-379

Abstract

We have obtained a good-quality R similar to 400, 0.8-2.5 mum spectrum as well as accurate photometry of Gliese 570D, one of the coolest and least-luminous brown dwarfs currently known. The spectrum shows that Gl 570D has deeper absorptions in the strong water and methane bands at 1.12-1.17, 1.33-1.45, 1.62-1.88, and 2.20-2.45 mum and is both bluer at J-K and redder at K-L' than previously observed T dwarfs. Data analysis using model spectra coupled with knowledge of the well-understood primary implies that for the same surface gravity, Gl 570D is about 160 K cooler than Gl 229B. For an age range of 2-5 Gyr, Gl 570D has an effective temperature in the range 784-824 K, a surface gravity log g in the range 5.00-5.27 (cm (s-2)), and a luminosity in the range (2.88-2.98) x 10(-6) L-circle dot.

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Documento generato il 25/05/18 alle ore 09:00:16