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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29716
Title: Rotation in the Pleiades with K2. III. Speculations on Origins and Evolution
Authors: Stauffer, John
Rebull, Luisa
Bouvier, Jerome
Hillenbrand, Lynne A.
Collier-Cameron, Andrew
Pinsonneault, Marc
Aigrain, Suzanne
Barrado, David
Bouy, Herve
Ciardi, David
Cody, Ann Marie
David, Trevor
MICELA, Giuseppina 
Soderblom, David
Somers, Garrett
Stassun, Keivan G.
Valenti, Jeff
Vrba, Frederick J.
Issue Date: 2016
Journal: THE ASTRONOMICAL JOURNAL 
Number: 152
Issue: 5
First Page: 115
Abstract: We use high-quality K2 light curves for hundreds of stars in the Pleiades to better understand 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 that was not available in previous studies. A slowly rotating sequence begins at {(V-{K}<SUB>{{s</SUB>}})}<SUB>0</SUB> ∼ 1.1 (spectral type F5) and ends at {(V-{K}<SUB>{{s</SUB>}})}<SUB>0</SUB> ∼ 3.7 (spectral type K8), with periods rising from ∼2 to ∼11 days in that interval. A total of 52% 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}<SUB>{{s</SUB>}})}<SUB>0</SUB> = 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 < {(V-{K}<SUB>{{s</SUB>}})}<SUB>0</SUB> < 6.0) nearly always show stable light curves, with little spot evolution or evidence of differential rotation. During pre-main-sequence evolution from ∼3 Myr (NGC 2264 age) to ∼125 Myr (Pleiades age), stars of 0.3 {M}<SUB>☉ </SUB> shed about half of their angular momentum, with the fractional change in period between 3 and 125 Myr being nearly independent of mass for fully convective stars. Our data also suggest that very low mass binaries form with rotation periods more similar to each other and faster than would be true if drawn at random from the parent population of single stars.
URI: http://hdl.handle.net/20.500.12386/29716
URL: https://iopscience.iop.org/article/10.3847/0004-6256/152/5/115
ISSN: 0004-6256
DOI: 10.3847/0004-6256/152/5/115
Bibcode ADS: 2016AJ....152..115S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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