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Title: New BVI {sub C} photometry of low-mass pleiades stars: Exploring the effects of rotation on broadband colors

We present new BVI{sub C} photometry for 350 Pleiades proper motion members with 9 < V ≲ 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 (≈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.
Authors:
;  [1] ;  [2] ;  [3]
  1. Department of Physics and Astronomy, Vanderbilt University, VU Station B 1807, Nashville, TN 37235 (United States)
  2. U.S. Naval Observatory, 10391 West Naval Observatory Road, Flagstaff, AZ 86001-8521 (United States)
  3. Spitzer Science Center, California Institute of Technology, MC 220-6, Pasadena, CA 91125 (United States)
Publication Date:
OSTI Identifier:
22342283
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 148; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BENCHMARKS; CATALOGS; COLOR; COMPARATIVE EVALUATIONS; CORRELATIONS; MASS; PHOTOMETRY; PROPER MOTION; ROTATION; STARS; STARSPOTS