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Rotation in the Pleiades with K2. III. Speculations on origins and evolution
- Publication Year :
- 2016
-
Abstract
- We use high quality K2 light curves for hundreds of stars in the Pleiades to understand better the angular momentum evolution and magnetic dynamos of young, low mass stars. The K2 light curves provide not only rotational periods but also detailed information from the shape of the phased light curve not available in previous studies. A slowly rotating sequence begins at $(V-K_{\rm s})_0\sim$1.1 (spectral type F5) and ends at $(V-K_{\rm s})_0\sim$ 3.7 (spectral type K8), with periods rising from $\sim$2 to $\sim$11 days in that interval. Fifty-two percent of the Pleiades members in that color interval have periods within 30\% of a curve defining the slow sequence; the slowly rotating fraction decreases significantly redward of $(V-K_{\rm s})_0$=2.6. Nearly all of the slow-sequence stars show light curves that evolve significantly on timescales less than the K2 campaign duration. The majority of the FGK Pleiades members identified as photometric binaries are relatively rapidly rotating, perhaps because binarity inhibits star-disk angular momentum loss mechanisms during pre-main sequence evolution. The fully convective, late M dwarf Pleiades members (5.0 $<br />Comment: 30 pages, 26 figures, accepted to AJ. Paper I is arXiv:1606.00052 and Paper II is arXiv:1606.00055
- Subjects :
- Angular momentum
Population
NDAS
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Rotation
01 natural sciences
individual (Pleiades) [Open clusters and associations]
0103 physical sciences
Differential rotation
Astrophysics::Solar and Stellar Astrophysics
QB Astronomy
education
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
QC
QB
Physics
education.field_of_study
010308 nuclear & particles physics
Astronomy and Astrophysics
Light curve
rotation [Stars]
Stars
QC Physics
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Astrophysics::Earth and Planetary Astrophysics
Low Mass
Pleiades
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....a6ffca85fa2372f35295d836d6c2f402