Astrophys. J., 822, 97-97 (2016/May-2)
Rotation-Activity Correlations in K and M dwarfs. I. Stellar parameters and compilations of v.sin(i) and P/sin(i) for a large sample of late-K and M dwarfs.
HOUDEBINE E.R., MULLAN D.J., PALETOU F. and GEBRAN M.
Abstract (from CDS):
The reliable determination of rotation-activity correlations (RACs) depends on precise measurements of the following stellar parameters: Teff, parallax, radius, metallicity, and rotational speed v sin i. In this paper, our goal is to focus on the determination of these parameters for a sample of K and M dwarfs. In a future paper (Paper II), we will combine our rotational data with activity data in order to construct RACs. Here, we report on a determination of effective temperatures based on the (R-I)_ C_ color from the calibrations of Mann et al. and Kenyon & Hartmann for four samples of late-K, dM2, dM3, and dM4 stars. We also determine stellar parameters (Teff, log(g), and [M/H]) using the principal component analysis-based inversion technique for a sample of 105 late-K dwarfs. We compile all effective temperatures from the literature for this sample. We determine empirical radius-[M/H] correlations in our stellar samples. This allows us to propose new effective temperatures, stellar radii, and metallicities for a large sample of 612 late-K and M dwarfs. Our mean radii agree well with those of Boyajian et al. We analyze HARPS and SOPHIE spectra of 105 late-K dwarfs, and we have detected v sin i in 92 stars. In combination with our previous v sin i measurements in M and K dwarfs, we now derive P/sin i measures for a sample of 418 K and M dwarfs. We investigate the distributions of P/sin i, and we show that they are different from one spectral subtype to another at a 99.9% confidence level.
© 2016. The American Astronomical Society. All rights reserved.
stars: fundamental parameters - stars: late-type - stars: rotation
VizieR on-line data:
<Available at CDS (J/ApJ/822/97): table1.dat table2.dat table3.dat table4.dat table5.dat table7.dat>
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