2000A&A...358L..33S

Query : 2000A&A...358L..33S

2000A&A...358L..33S - Astronomy and Astrophysics, volume 358L33-36 (2000/6-2)

Line formation in the Atmosphere of brown dwarf Gliese 229B : CH4 at 2.3µm.

SENGUPTA S. and KRISHAN V.

Abstract (from CDS):

We investigate the formation of methane line at 2.3µm in Brown Dwarf Gliese 229B. Two sets of model parameters with (a) Teff=940K and log(g)=5.0, (b) Teff=1030K and log(g)=5.5 are adopted both of which provide excellent fit for the synthetic continuum spectra with the observed flux at a wide range of wavelengths. In the absence of observational data for individual molecular lines, we set the additional parameters that are needed in order to model the individual lines by fitting the calculated flux with the observed flux at the continuum. A significant difference in the amount of flux at the core of the line is found with the two different models although the flux at the continuum remains the same. Hence, we show that if spectroscopic observation at 2.3µm with a resolution as high as R≃200,000 is possible then a much better constraint on the surface gravity and on the metallicity of the object could be obtained by fitting the theoretical model of individual molecular line with the observed data.

Abstract Copyright: ∼

Journal keyword(s): molecular processes - line: formation - radiative transfer - stars: low-mass, brown dwarfs

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0

Query : 2000A&A...358L..33S

Basic data :
HD 42581B -- Brown Dwarf
Other object types: otypes_help 		* (CNS5,GJ,...), ** (2024ApJ,**,...), BD* (1999ApJ), Rad ([B2006])
ICRS coord. (ep=J2000) : 		06 10 34.80 -21 52 00.0 [ ] C 2009AJ....137....1F
FK4 coord. (ep=B1950 eq=1950) : 		06 08 28.33 -21 50 42.7 [ ]
Gal coord. (ep=J2000) : 		228.61456 -18.43930 [ ]
Proper motions mas/yr : 		-137.0 -714.1 [0.9 0.6 0] D 2009AJ....137....1F
Parallaxes (mas): 		173.19 [1.12] C 2012ApJ...752...56F
Spectral type: 		T6.5 C 2000ApJ...531L..57B
Fluxes (3) :
J 14.01 [0.05] C 2012ApJ...752...56F
H 14.36 [0.05] C 2012ApJ...752...56F
K 14.36 [0.05] C 2012ApJ...752...56F
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Identifiers (7) :
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** NAJ 1B GJ 229 B 8pc 173.19B [B2006] J061035.1-215117
CNS5 1529 HD 42581B WDS J06106-2152B

References (549 between 1850 and 2026) (Total 549)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Distance : 2    Plx : 1    SpT : 6   

   

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GJ 229 B HD 42581B WDS J06106-2152B

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