2016AJ....152..141B -
Astron. J., 152, 141-141 (2016/November-0)
The solar neighborhood. XXXVII: the mass-luminosity relation for main-sequence M dwarfs.
BENEDICT G.F., HENRY T.J., FRANZ O.G., McARTHUR B.E., WASSERMAN L.H., JAO W.-C., CARGILE P.A., DIETERICH S.B., BRADLEY A.J., NELAN E.P. and WHIPPLE A.L.
Abstract (from CDS):
We present a mass-luminosity relation (MLR) for red dwarfs spanning a range of masses from 0.62 \mathcalM☉ to the end of the stellar main sequence at 0.08 \mathcalM☉. The relation is based on 47 stars for which dynamical masses have been determined, primarily using astrometric data from Fine Guidance Sensors (FGS) 3 and 1r, white-light interferometers on the Hubble Space Telescope (HST), and radial velocity data from McDonald Observatory. For our HST/FGS sample of 15 binaries, component mass errors range from 0.4% to 4.0% with a median error of 1.8%. With these and masses from other sources, we construct a V-band MLR for the lower main sequence with 47 stars and a K-band MLR with 45 stars with fit residuals half of those of the V band. We use GJ 831 AB as an example, obtaining an absolute trigonometric parallax, πabs = 125.3 ± 0.3 mas, with orbital elements yielding \mathcalMA=0.270±0.004 \mathcalM☉ and \mathcalMB=0.145±0.002 \mathcalM☉. The mass precision rivals that derived for eclipsing binaries. A remaining major task is the interpretation of the intrinsic cosmic scatter in the observed MLR for low-mass stars in terms of physical effects. In the meantime, useful mass values can be estimated from the MLR for the ubiquitous red dwarfs that account for 75% of all stars, with applications ranging from the characterization of exoplanet host stars to the contribution of red dwarfs to the mass of the universe.
Abstract Copyright:
© 2016. The American Astronomical Society. All rights reserved.
Journal keyword(s):
astrometry - binaries: close - stars: distances - stars: late-type - techniques: interferometric - techniques: radial velocities - techniques: radial velocities
VizieR on-line data:
<Available at CDS (J/AJ/152/141): table1.dat table3.dat table8.dat>
Simbad objects:
35
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