Theoretical models of low-mass stars and brown dwarfs. I - The lower main sequence

1989 ◽  
Vol 342 ◽  
pp. 1003 ◽  
Author(s):  
Ben Dorman ◽  
Lorne A. Nelson ◽  
W. Y. Chau
Keyword(s):  
Main Sequence ◽  
Brown Dwarfs ◽  
Theoretical Models ◽  
Low Mass Stars ◽  
Low Mass

Evolution of very low mass stars and brown dwarfs. I - The minimum main-sequence mass and luminosity

1985 ◽  
Vol 296 ◽  
pp. 502 ◽  
Author(s):  
F. Dantona ◽  
I. Mazzitelli
Keyword(s):  
Main Sequence ◽  
Brown Dwarfs ◽  
Low Mass Stars ◽  
Low Mass

Theoretical models of very low mass stars and brown dwarfs

1989 ◽  
Vol 345 ◽  
pp. 939 ◽  
Author(s):  
Adam Burrows ◽  
W. B. Hubbard ◽  
Jonathan I. Lunine
Keyword(s):  
Brown Dwarfs ◽  
Theoretical Models ◽  
Low Mass Stars ◽  
Low Mass

scholarly journals Atmosphere models for very low mass stars, brown dwarfs and exoplanets

1997 ◽  
Vol 189 ◽  
pp. 227-233
Author(s):  
I. Baraffe ◽  
F. Allard
Keyword(s):  
Main Sequence ◽  
Accurate Determination ◽  
Brown Dwarfs ◽  
Considerable Effort ◽  
Low Mass Stars ◽  
The Past ◽  
Substellar Objects ◽  
Cool Stars ◽  
Low Mass

Over the past decade considerable effort, both observational and theoretical, has been directed towards a more accurate determination of the stellar lower main sequence and of the sub-stellar domain covered by Brown Dwarfs and Planets. Astronomers have been looking for brown dwarfs for more than a decade, either with standard astronomical technics or with microlensing experiments. A breakthrough in the search for brown dwarfs was very recently achieved with the discovery of the first cool brown dwarf GL 229B (Nakajima et al. 1995). At the same epoch, the search for planets blossomed with the discovery of a Jupiter - mass companion of the star 51 Pegasi (Mayor and Queloz 199,5). Now, the number of faint, cool stars and substellar objects is rising rapidly.

scholarly journals Physical Properties of Binary Brown Dwarfs

2009 ◽  
Vol 5 (H15) ◽  
pp. 757-757
Author(s):  
W. Brandner ◽  
M. Stumpf ◽  
R. Köhler ◽  
V. Joergens ◽  
F. Hormuth ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Hubble Space Telescope ◽  
Brown Dwarfs ◽  
Theoretical Models ◽  
Low Mass Stars ◽  
Spatially Resolved ◽  
Mass Estimate ◽  
Low Mass ◽  
Photometric Monitoring

Astrometric observations of binary brown dwarfs yield dynamical masses of the components independently of theoretical models. We give an update on our long-term high-resolution spectroscopic and photometric monitoring programme of spatially resolved binary brown dwarfs using ground-based adaptive optics and the Hubble Space Telescope. We present current orbital fits, including refined dynamical mass estimate of the Kelu-1 AB system. The results seem to support the previously reported trend that evolutionary and atmospheric models might underestimate the mass of very-low-mass stars and brown dwarfs.

scholarly journals Pre-Main Sequence Models for Low-Mass Stars and Brown Dwarfs

2001 ◽  
Vol 200 ◽  
pp. 483-491
Author(s):  
Isabelle Baraffe ◽  
Gilles Chabrier ◽  
France Allard ◽  
Peter Hauschildt
Keyword(s):  
Equation Of State ◽  
Main Sequence ◽  
Brown Dwarfs ◽  
Evolutionary Models ◽  
Recent Improvement ◽  
Low Mass Stars ◽  
Theory Equation ◽  
Low Mass

We present evolutionary models for young low mass stars (m ≤ 1M⊙) based on recent improvement of the theory: equation of state, atmosphere models, etc. We concentrate on early evolutionary phases from the initial deuterium burning phase to the zero-age Main Sequence. Evolutionary models for young brown dwarfs are also presented. We discuss the uncertainties of the present models. We analyse the difficulties arising when comparing models with observations for very young objects, in particular concerning the problem of reddening.

scholarly journals Effect of accretion on the pre-main-sequence evolution of low-mass stars and brown dwarfs

2017 ◽  
Vol 605 ◽  
pp. A77 ◽  
Author(s):  
Eduard I. Vorobyov ◽  
Vardan Elbakyan ◽  
Takashi Hosokawa ◽  
Yuya Sakurai ◽  
Manuel Guedel ◽  
...  
Keyword(s):  
Main Sequence ◽  
Brown Dwarfs ◽  
Sequence Evolution ◽  
Low Mass Stars ◽  
Low Mass

scholarly journals Magnetic Activity of Pre-main Sequence Stars near the Stellar-Substellar Boundary

2015 ◽  
Vol 10 (S314) ◽  
pp. 126-127
Author(s):  
David Principe ◽  
Joel. H. Kastner ◽  
David Rodriguez
Keyword(s):  
Spectral Type ◽  
Main Sequence ◽  
Brown Dwarfs ◽  
Magnetic Activity ◽  
Main Sequence Stars ◽  
Coronal Emission ◽  
Low Mass Stars ◽  
X Ray ◽  
Low Mass ◽  
Age Range

AbstractX-ray observations of pre-main sequence (pre-MS) stars of M-type probe coronal emission and offer a means to investigate magnetic activity at the stellar-substellar boundary. Recent observations of main sequence (MS) stars at this boundary display a decrease in fractional X-ray luminosity (LX/Lbol) by almost two orders of magnitude for spectral types M7 and later. We investigate magnetic activity and search for a decrease in X-ray emission in the pre-MS progenitors of these MS stars. We present XMM-Newton X-ray observations and preliminary results for ~10 nearby (30-70 pc), very low mass pre-MS stars in the relatively unexplored age range of 10-30 Myr. We compare the fractional X-ray luminosities of these 10-30 Myr old stars to younger (1-3 Myr) pre-MS brown dwarfs and find no dependence on spectral type or age suggesting that X-ray activity declines at an age later than ~30 Myr in these very low-mass stars.

scholarly journals Research on the Bottom of the Main Sequence and Brown Dwarfs in the Early Days

2003 ◽  
Vol 211 ◽  
pp. 551-552
Author(s):  
Takenori Nakano
Keyword(s):  
Main Sequence ◽  
Brown Dwarfs ◽  
Low Mass Stars ◽  
Low Mass

One of the earliest works on the evolution of very low mass stars, Hayashi & Nakano (1963), is introduced, which determined self-consistently the bottom of the main sequence at 0.08M⊙ and investigated the evolution of an object of 0.05M⊙ from the stages with negligible electron degeneracy to those with high degeneracy.

scholarly journals Radial and rotational velocities of young brown dwarfs and very low-mass stars in the Upper Scorpius OB association and the   Ophiuchi cloud core

2006 ◽  
Vol 372 (4) ◽  
pp. 1879-1887 ◽  
Author(s):  
R. Kurosawa ◽  
T. J. Harries ◽  
S. P. Littlefair
Keyword(s):  
Brown Dwarfs ◽  
Low Mass Stars ◽  
Low Mass ◽  
Cloud Core
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