The very low mass multiple system LHS\,1070 -- a testbed for model atmospheres for the lower end of the main sequence

Arvind Singh Rajpurohit; C. Reyle; M. Schultheis; Ch. Leinert; France Allard; D. Homeier; T. Ratzka; P. Abraham; B. Moster; S. Witte; N. Ryde

The very low mass multiple system LHS\,1070 -- a testbed for model atmospheres for the lower end of the main sequence

Arvind Singh Rajpurohit ¹ C. Reyle ¹ M. Schultheis ¹ Ch. Leinert ² France Allard ³ D. Homeier ³ T. Ratzka P. Abraham B. Moster S. Witte N. Ryde

1 LAOB - Laboratoire d'astrophysique de l'observatoire de Besançon

2 MPIA - Max-Planck-Institut für Astronomie

3 CRAL - Centre de Recherche Astrophysique de Lyon

Abstract : LHS1070 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 LHS1070 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 LHS1070 and to test recent model atmospheres: BT-Dusty,BT-Settl, DRIFT, and MARCS models.Unlike in previous studies, we have performed a chi^2-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 log g for each of the three components of LHS1070.

Keywords : Stars: atmospheres Stars: fundamental parameters Stars: low-mass brown dwarfs binaries: general

Document type :

Journal articles

Domain :

Physics [physics] / Astrophysics [astro-ph] / Solar and Stellar Astrophysics [astro-ph.SR]

Sciences of the Universe [physics] / Astrophysics [astro-ph] / Solar and Stellar Astrophysics [astro-ph.SR]

Complete list of metadatas

https://hal-ens-lyon.archives-ouvertes.fr/ensl-00768048
Contributor : France Allard <>
Submitted on : Thursday, December 20, 2012 - 5:37:08 PM
Last modification on : Friday, April 5, 2019 - 8:14:31 PM

The very low mass multiple system LHS\,1070 -- a testbed for model atmospheres for the lower end of the main sequence

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The very low mass multiple system LHS\,1070 -- a testbed for model atmospheres for the lower end of the main sequence

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