Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Activity-Rotation Relationship and Kinematic Analysis of Nearby
  Mid-to-Late-type M Dwarfs   Using spectroscopic observations and photometric light curves of 238 nearby M
dwarfs from the MEarth exoplanet transit survey, we examine the relationships
between magnetic activity (quantified by H-alpha emission), rotation period,
and stellar age. Previous attempts to investigate the relationship between
magnetic activity and rotation in these stars were hampered by the limited
number of M dwarfs with measured rotation periods (and the fact that vsini
measurements probe only rapid rotation). However, the photometric data from
MEarth allows us to probe a wide range of rotation periods for hundreds of M
dwarf stars (from shorter than than one to longer than 100 days). Over all M
spectral types that we probe, we find that the presence of magnetic activity is
tied to rotation, including for late-type, fully convective M dwarfs. We also
find evidence that the fraction of late-type M dwarfs that are active may be
higher at longer rotation periods compared to their early-type counterparts,
with several active, late-type, slowly rotating stars present in our sample.
Additionally, we find that all M dwarfs with rotation periods shorter than 26
days (early-type; M1-M4) and 86 days (late-type; M5-M8) are magnetically
active. This potential mismatch suggests that the physical mechanisms that
connect stellar rotation to chromospheric heating may be different in fully
convective stars. A kinematic analysis suggests that the magnetically active,
rapidly rotating stars are consistent with a kinematically young population,
while slow-rotators are less active or inactive and appear to belong to an
older, dynamically heated stellar population.

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The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
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The categories of this paper are: nucl-th
3
The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
1
The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org