2001ApJ...548..908L


Query : 2001ApJ...548..908L

2001ApJ...548..908L - Astrophys. J., 548, 908-918 (2001/February-3)

Infrared spectra and spectral energy distributions of late M and L dwarfs.

LEGGETT S.K., ALLARD F., GEBALLE T.R., HAUSCHILDT P.H. and SCHWEITZER A.

Abstract (from CDS):

We have obtained 1.0-2.5 µm spectra at R∼600 of 14 disk dwarfs with spectral types M6-L7. For four of the dwarfs, we have also obtained infrared spectra at R∼3000 in several narrow intervals. In addition, we present new L' photometry for four of the dwarfs in the sample, which allows improved determinations of their bolometric luminosities. While obtaining the photometry we resolved the L dwarf Denis-P J0205-1159 into an identical pair of objects separated by 0".35. The spectra together with the published energy distribution for one other L5 dwarf are compared to synthetic spectra generated by upgraded model atmospheres. Good matches are found for 2200 K≥Teff≥1900 K (spectral types around M9-L3), but discrepancies exist at Teff≥2300 K (M8) and Teff≤1800 K (L4-L7). At the higher temperatures the mismatches are due to incompleteness in the water vapor opacity line list. At the lower temperatures the disagreement is probably due to our treatment of dust; we assume a photospheric distribution in equilibrium with the gas phase and neglect any diffusion mechanisms. We derive effective temperatures for the sample from the comparison with synthetic spectra and also by comparing our observed total intrinsic luminosities to structural model calculations (which are mostly independent of the atmosphere but are dependent on the unknown masses and ages of the targets). The two derivations agree to about 200 K except for the faintest object in the sample, where the discrepancy is larger. Agreement with other temperature determinations is also ±∼200 K, except for the L7 dwarf.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - Stars: Fundamental Parameters - Stars: Late-Type - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 16

goto Full paper

goto View the references in ADS

Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* DY Psc BY* 00 24 24.6317407560 -01 58 19.954412004     19.42 17.301 15.022 M9.5V 197 1
2 DENIS J020529.0-115925 BD* 02 05 29.3651195393 -11 59 29.721210536           L7V 144 0
3 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 276 0
4 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1616128256 +25 40 23.239779672         17.36 L0V 117 0
5 SIPS J0539-0059 BD* 05 39 52.0040375405 -00 59 01.491092352           L5V 77 0
6 LP 666-9 LM* 08 53 36.1604798120 -03 29 32.197505547     18.959 16.781 14.487 M9Ve 238 0
7 SIPS J1058-1548 BD* 10 58 47.8366017792 -15 48 17.250428304       20.095 17.764 L3V 89 2
8 SIPS J1228-1547 BD* 12 28 15.23184 -15 47 34.2312       20.187 18.163 L5.5+L5.5 139 0
9 NAME Kelu-1 BD* 13 05 40.1642434199 -25 41 05.712165150         16.85 L2+L3.5 243 0
10 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 200 0
11 LP 98-79 Er* 14 30 37.7904858054 +59 43 24.867105409   19.7 17.88 16.8 13.31 M6.5V 66 0
12 LP 914-54 Er* 14 56 38.2634715567 -28 09 48.619153485     17.141 14.863 12.433 M7.0Ve 144 0
13 TVLM 513-46 LM* 15 01 08.1864639648 +22 50 02.137869060   21.4 15.09 18.0   M8.5V 155 0
14 * eta CrB C BD* 15 23 22.63488 +30 14 56.2092           L8V 99 1
15 VB 8 Er* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 412 0
16 LP 229-30 CV* 18 43 22.1259892136 +40 40 21.343851516   19.2   16.6   M7.5Ve 60 0

To bookmark this query, right click on this link: simbad:objects in 2001ApJ...548..908L and select 'bookmark this link' or equivalent in the popup menu


2022.07.06-18:56:37

© Université de Strasbourg/CNRS

    • Contact