期刊
ASTRONOMICAL JOURNAL
卷 152, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/0004-6256/152/5/141
关键词
astrometry; binaries : close; stars : distances; stars : late-type; techniques : interferometric; echniques : radial velocities
资金
- NASA from the Space Telescope Science Institute [GTO NAG5-1603, GO-6036, 6047, 6566, 6764, 6882, 6883, 6884, 7491, 7493, 7894, 8292, 8728, 8729, 8774, 9234, 9408, 9972, 10104, 10613, 10773, 10929, 11299, 12629]
- NASA [NAS5-26555]
- National Science Foundation [AST 05-07711, AST 09-08402, AST 14-12026]
- NSF
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1412026] Funding Source: National Science Foundation
We present a mass-luminosity relation (MLR) for red dwarfs spanning a range of masses from 0.62 M-circle dot to the end of the stellar main sequence at 0.08 M-circle dot. 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,pi(abs) = 125.3 +/- 0.3 mas, with orbital elements yielding. M-A=0.270 +/- 0.004 M-circle dot and M-B = 0.145 +/- 0.002 M-circle dot. 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.
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