J/A+A/545/A85 LHS1070 photometry and spectroscopy (Rajpurohit+, 2012)
The very low mass multiple system LHS 1070. A testbed for model atmospheres for
the lower end of the main sequence.
Rajpurohit A.S., Reyle C., Schultheis M., Leinert C., Allard F., Homeier D.,
Ratzka T., Abraham P., Moster B., Witte S., Ryde N.
<Astron. Astrophys. 545, A85 (2012)>
=2012A&A...545A..85R 2012A&A...545A..85R
ADC_Keywords: Stars, dwarfs ; Stars, flare ; Photometry
Keywords: stars: atmospheres - stars: fundamental parameters -
stars: low-mass - brown dwarfs - binaries: general
Abstract:
LHS 1070 is a nearby multiple system of low mass stars. It is an
important source of information for probing the low mass end of the
main sequence, down to the hydrogen-burning limit. The primary of the
system is a mid-M dwarf and two components are late-M to early L
dwarfs, at the star-brown dwarf transition. Hence LHS 1070 is a
valuable object to understand the onset of dust formation in cool
stellar atmospheres.
This work aims at determining the fundamental stellar parameters of
LHS 1070 and to test recent model atmospheres: BT-Dusty, BT-Settl,
DRIFT, and MARCS models.
Description:
Unlike in previous studies, we have performed a χ2-minimization
comparing well calibrated optical and infrared spectra with recent
cool star synthetic spectra leading to the determination of the
physical stellar parameters Teff, radius, and logg for each of the
three components of LHS 1070.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
00 24 44.19 -27 08 24.2 LHS1070 = GJ 2005
------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 93 24 Infrared photometric data for the three components
of LHS1070
fos.dat 52 3381 HST/FOS optical spectra of components A, B, C
of LHS 1070
nicmos.dat 51 204 HST/NICMOS near-IR spectra of components A, B, C
of LHS 1070
naco.dat 51 1437 VLT/NaCo near-IR spectra of components A, B, C
of LHS 1070
isophot.dat 19 128 ISO/ISOPHOT IR spectra of the unresolved source
A+B+C of LHS 1070
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.3 um lambda [0.9/14.3] Wavelength
9- 17 A9 --- Filt Filter
19- 25 F7.3 [cW/m2/nm] logFluxA ?=- log10 Flux for component A
27- 31 F5.3 [cW/m2/nm] e_logFluxA ?=- Error on logFluxA
33- 39 F7.3 [cW/m2/nm] logFluxB ?=- log10 Flux for component B
41- 45 F5.3 [cW/m2/nm] e_logFluxB ?=- Error on logFluxB
47- 53 F7.3 [cW/m2/nm] logFluxC ?=- log10 Flux for component C
55- 59 F5.3 [cW/m2/nm] e_logFluxC ?=- Error on logFluxC
61- 67 F7.3 [cW/m2/nm] logFlux ?=- log10 Flux for componentS A+B+C
69- 73 F5.3 [cW/m2/nm] e_logFlux ?=- Error on logFlux
76- 80 F5.1 Jy FluxJ ? Flux for components A+B+C
in original notation (mJy) (1)
82- 83 I2 Jy e_FluxJ ? Error on FluxJ
85- 88 F4.2 mag FluxM ? Flux for components A+B+C
in original notation (mag)
90- 93 F4.2 mag e_FluxM ? Error on FluxM
--------------------------------------------------------------------------------
Note (1): The values for the NICMOS filters (NIC1,NIC2,NIC3) are the sum of
the values measured directly for the individual components
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fos.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 E11.6 0.1nm lambda [3540/84989] Wavelength
13- 22 E10.5 cW/m2/s/nm FluxA Flux for component A
25- 36 E12.6 cW/m2/s/nm FluxB Flux for component B
41- 52 E12.6 cW/m2/s/nm FluxC Flux for component C
--------------------------------------------------------------------------------
Byte-by-byte Description of file: nicmos.dat naco.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.4 um lambda [0.8/2.47] Wavelength
9- 13 F5.1 mJy FluxA Flux for component A
17- 21 F5.1 mJy e_FluxA ?=- Error on fluxA
24- 28 F5.1 mJy FluxB Flux for component B
32- 36 F5.1 mJy e_FluxB ?=- Error on fluxB
39- 43 F5.1 mJy FluxC Flux for component C
47- 51 F5.1 mJy e_FluxC ?=- Error on fluxC
--------------------------------------------------------------------------------
Byte-by-byte Description of file: isophot.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.3 um lambda [2.46/11.63] Wavelength
8- 13 F6.3 Jy Flux Flux for components A+B+C
15- 19 F5.3 Jy e_Flux Error in Flux
--------------------------------------------------------------------------------
Acknowledgements:
Celine Reyle,
(End) Patricia Vannier [CDS] 06-Aug-2012