New BVI C Photometry of Low-Mass Pleiades Stars: Exploring the Effects of Rotation on Broadband Colors
Abstract
We present new BVIC 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 CMDthat 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2014
- Accession Number
- ADA607151
Entities
People
- Brittany L. Kamai
- Frederick J. Vrba
- John R. Stauffer
- Keivan G. Stassun
Organizations
- United States Naval Observatory Flagstaff Station