Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectroscopic confirmation of M-dwarf candidate members of the Beta
  Pictoris and AB Doradus Moving Groups   Optical spectroscopic observations are reported for 24 and 23, nearby,
proper-motion-selected M-dwarf candidate members of the Beta Pictoris and AB
Doradus moving groups (BPMG and ABDMG). Using kinematic criteria, the presence
of both Halpha emission and high X-ray-to-bolometric luminosity, and position
in absolute colour-magnitude diagrams, 10 and 6 of these candidates are
confirmed as likely members of the BPMG and ABDMG respectively. Equivalent
widths or upper limits for the Li I 6708A line are reported and the lithium
depletion boundary (LDB) age of the BPMG is revisited. Whilst non-magnetic
evolutionary models still yield an estimated age of 21 +/- 4 Myr, models that
incorporate magnetic inhibition of convection imply an older age of 24 +/- 4
Myr. A similar systematic increase would be inferred if the stars were 25 per
cent covered by dark magnetic starspots. Since young, convective M-dwarfs are
magnetically active and do have starspots, we suggest that the original LDB age
estimate is a lower limit. The LDB age of the ABDMG is still poorly constrained
-- non-magnetic evolutionary models suggest an age in the range 35-150 Myr,
which could be significantly tightened by new measurements for existing
candidate members.

14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat