期刊
ASTRONOMICAL JOURNAL
卷 148, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/148/2/30
关键词
catalogs; Hertzsprung-Russell and C-M diagrams; open clusters and associations: individual (Pleiades); stars: low-mass; stars: rotation; starspots
资金
- NSF Graduate Research Fellowship [DGE-0909667]
- NSF PAARE [AST-0849736]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009810] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1109612] Funding Source: National Science Foundation
We present new BVIC photometry for 350 Pleiades proper motion members with 9 < V less than or similar to 17. Importantly, our new catalog includes a large number of K- and early M-type stars, roughly doubling the number of low-mass stars with well-calibrated Johnson/Cousins photometry in this benchmark cluster. We combine our new photometry with existing photometry from the literature to define a purely empirical isochrone at Pleiades age (approximate to 100 Myr) extending from V = 9 to 17. We use the empirical isochrone to identify 48 new probable binaries and 14 likely nonmembers. The photometrically identified single stars are compared against their expected positions in the color-magnitude diagram (CMD). At 100 Myr, the mid K and early M stars are predicted to lie above the zero-age main sequence (ZAMS) having not yet reached the ZAMS. We find in the B - V versus V CMD that mid K and early M dwarfs are instead displaced below (or blueward of) the ZAMS. Using the stars' previously reported rotation periods, we find a highly statistically significant correlation between rotation period and CMD displacement, in the sense that the more rapidly rotating stars have the largest displacements in the B - V CMD.
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