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
Type de document :
Article dans une revue
Astronomy and Astrophysics - A&A, EDP Sciences, 2012, 545, pp.A85. 〈10.1051/0004-6361/201219029〉
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https://hal-ens-lyon.archives-ouvertes.fr/ensl-00768048
Contributeur : France Allard <>
Soumis le : jeudi 20 décembre 2012 - 17:37:08
Dernière modification le : lundi 3 décembre 2018 - 14:30:03

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Arvind Singh Rajpurohit, C. Reyle, M. Schultheis, Ch. Leinert, France Allard, et al.. The very low mass multiple system LHS\,1070 -- a testbed for model atmospheres for the lower end of the main sequence. Astronomy and Astrophysics - A&A, EDP Sciences, 2012, 545, pp.A85. 〈10.1051/0004-6361/201219029〉. 〈ensl-00768048〉

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