Proper Motions of Very Low Mass Stars and Brown Dwarfs in Open Clusters

2000 ◽  
pp. 17-28
Author(s):  
N. C. Hambly
Keyword(s):  
Brown Dwarfs ◽  
Open Clusters ◽  
Proper Motions ◽  
Low Mass Stars ◽  
Low Mass

scholarly journals A Review on Substellar Objects below the Deuterium Burning Mass Limit: Planets, Brown Dwarfs or What?

Geosciences ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 362 ◽  
Author(s):  
José Caballero
Keyword(s):  
Brown Dwarfs ◽  
Open Clusters ◽  
Formation Mechanisms ◽  
Mass Limit ◽  
Low Mass Stars ◽  
Open Clusters And Associations ◽  
Substellar Objects ◽  
History Of ◽  
Low Mass ◽  
Moving Groups

“Free-floating, non-deuterium-burning, substellar objects” are isolated bodies of a few Jupiter masses found in very young open clusters and associations, nearby young moving groups, and in the immediate vicinity of the Sun. They are neither brown dwarfs nor planets. In this paper, their nomenclature, history of discovery, sites of detection, formation mechanisms, and future directions of research are reviewed. Most free-floating, non-deuterium-burning, substellar objects share the same formation mechanism as low-mass stars and brown dwarfs, but there are still a few caveats, such as the value of the opacity mass limit, the minimum mass at which an isolated body can form via turbulent fragmentation from a cloud. The least massive free-floating substellar objects found to date have masses of about 0.004 Msol, but current and future surveys should aim at breaking this record. For that, we may need LSST, Euclid and WFIRST.

scholarly journals Ages of Galactic and Extragalactic Star Clusters of Various Abundances

1983 ◽  
Vol 6 ◽  
pp. 109-117 ◽  
Author(s):  
R.D. Cannon
Keyword(s):  
Star Clusters ◽  
Magellanic Clouds ◽  
Open Clusters ◽  
Simultaneous Solution ◽  
Low Mass Stars ◽  
Cluster Systems ◽  
Distant Cluster ◽  
Low Mass

In this review I shall concentrate mainly on globular star clusters in our Galaxy since these are the objects for which most work has been done recently, both observationally and theoretically. However, I shall also discuss briefly the oldest open clusters and clusters in the Magellanic Clouds. Little can be said about more distant cluster systems, since the only observations available are of integrated colours or spectra and these seem to be rather unreliable indicators of age. It is perhaps worth pointing out that the title may be slightly misleading; the problem is not so much to determine the ages of clusters of known abundances, as to obtain the best simultaneous solution for both age and composition, since some of the most important abundances (notably helium and oxygen) are virtually unobservable in little-evolved low mass stars.

scholarly journals Primeval very low-mass stars and brown dwarfs – II. The most metal-poor substellar object

2017 ◽  
Vol 468 (1) ◽  
pp. 261-271 ◽  
Author(s):  
Z. H. Zhang 张曾华 ◽  
D. Homeier ◽  
D. J. Pinfield ◽  
N. Lodieu ◽  
H. R. A. Jones ◽  
...  
Keyword(s):  
Brown Dwarfs ◽  
Low Mass Stars ◽  
Low Mass

scholarly journals A mid-infrared study of very low mass stars and brown dwarfs in Upper Scorpius

2006 ◽  
Vol 463 (2) ◽  
pp. 641-646 ◽  
Author(s):  
H. Bouy ◽  
N. Huélamo ◽  
E. L. Martín ◽  
D. Barrado y Navascués ◽  
M. Sterzik ◽  
...  
Keyword(s):  
Brown Dwarfs ◽  
Low Mass Stars ◽  
Infrared Study ◽  
Mid Infrared ◽  
Low Mass

scholarly journals A census of very-low-mass stars and brown dwarfs in the σ Orionis cluster

2009 ◽  
Vol 505 (3) ◽  
pp. 1115-1127 ◽  
Author(s):  
N. Lodieu ◽  
M. R. Zapatero Osorio ◽  
R. Rebolo ◽  
E. L. Martín ◽  
N. C. Hambly
Keyword(s):  
Brown Dwarfs ◽  
Low Mass Stars ◽  
Low Mass
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