J/ApJ/804/64 Empirical and model parameters of 183 M dwarfs (Mann+, 2015)
How to constrain your M dwarf: measuring effective temperature,
bolometric luminosity, mass, and radius.
Mann A.W., Feiden G.A., Gaidos E., Boyajian T., Von Braun K.
<Astrophys. J., 804, 64 (2015)>
=2015ApJ...804...64M 2015ApJ...804...64M
ADC_Keywords: Stars, M-type ; Spectral types ; Effective temperatures ;
Abundances ; Photometry
Keywords: planetary systems - stars: abundances -
stars: fundamental parameters - stars: late-type - stars: low-mass -
stars: statistics
Abstract:
Precise and accurate parameters for late-type (late K and M) dwarf
stars are important for characterization of any orbiting planets, but
such determinations have been hampered by these stars' complex spectra
and dissimilarity to the Sun. We exploit an empirically calibrated
method to estimate spectroscopic effective temperature (Teff) and
the Stefan-Boltzmann law to determine radii of 183 nearby K7-M7 single
stars with a precision of 2%-5%. Our improved stellar parameters
enable us to develop model-independent relations between Teff or
absolute magnitude and radius, as well as between color and Teff.
The derived Teff-radius relation depends strongly on [Fe/H], as
predicted by theory. The relation between absolute KSmagnitude and
radius can predict radii accurate to ~=3%. We derive bolometric
corrections to the VRCICgrizJHKS and Gaia passbands as a
function of color, accurate to 1%-3%. We confront the reliability of
predictions from Dartmouth stellar evolution models using a Markov
chain Monte Carlo to find the values of unobservable model parameters
(mass, age) that best reproduce the observed effective temperature and
bolometric flux while satisfying constraints on distance and
metallicity as Bayesian priors. With the inferred masses we derive a
semi-empirical mass-absolute magnitude relation with a scatter of 2%
in mass. The best-agreement models overpredict stellar Teff values
by an average of 2.2% and underpredict stellar radii by 4.6%, similar
to differences with values from low-mass eclipsing binaries. These
differences are not correlated with metallicity, mass, or indicators
of activity, suggesting issues with the underlying model assumptions,
e.g., opacities or convective mixing length.
Description:
Derived parameters (temperatures, radii, masses, spectral types,
abundances) as well as synthetic photometry and model-derived
parameters for 183 nearby M dwarfs with 5% or better parallaxes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 370 183 Data on all 183 stars (tables 5-7 of the paper)
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See also:
I/298 : LSPM-North Catalog (Lepine+ 2005)
J/AJ/142/138 : All-sky catalog of bright M dwarfs (Lepine+, 2011)
J/MNRAS/443/2561 : Trumpeting M dwarfs with CONCH-SHELL (Gaidos+, 2014)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name LG11, CONCH-Shell, or LSPM Name (1)
18- 27 A10 --- CNS3 ? Gliese or GJ name
29- 37 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
39- 47 F9.5 deg DEdeg Declination in decimal degrees (J2000)
49- 56 F8.5 10pW/m2 Fbol [0.02/23] Bolometric Flux (10-8erg/cm2/s)
58- 64 F7.5 10pW/m2 e_Fbol [0.0002/0.2] Error on Fbol
66- 69 I4 K Teff [2700/4131] Stellar effective temperature
71- 72 I2 K e_Teff [60/86] Error on Teff
74- 79 F6.4 Rsun R [0.1/0.7] Stellar Radius
81- 86 F6.4 Rsun e_R [0.005/0.04] Error on R
88- 93 F6.4 Msun M [0.08/0.75] Stellar Mass
95-100 F6.4 Msun e_M [0.008/0.08] Error on M
102-106 F5.2 [Sun] [Fe/H] [-0.61/0.53] Metallicity
108-111 F4.2 [Sun] e_[Fe/H] [0.03/0.08] Error on [Fe/H]
113-118 A6 --- SpT MK spectral Type
120-125 F6.3 mag Bmag [7.4/18.7] Synthetic Johnson B magnitude
127-131 F5.3 mag e_Bmag [0.02/0.04] Error on Bmag
133-138 F6.3 mag Vmag Synthetic Johnson V magnitude
140-144 F5.3 mag e_Vmag Error on Vmag
146-151 F6.3 mag Rmag Synthetic Cousins R magnitude
153-157 F5.3 mag e_Rmag Error on Rmag
159-164 F6.3 mag Imag Synthetic Cousins I magnitude
166-170 F5.3 mag e_Imag Error on Imag
172-177 F6.3 mag gmag Synthetic SDSS g magnitude
179-183 F5.3 mag e_gmag Error on gmag
185-190 F6.3 mag rmag Synthetic SDSS r magnitude
192-196 F5.3 mag e_rmag Error on rmag
198-203 F6.3 mag imag Synthetic SDSS i magnitude
205-209 F5.3 mag e_imag Error on imag
211-216 F6.3 mag zmag Synthetic SDSS z magnitude
218-222 F5.3 mag e_zmag Error on zmag
224-229 F6.3 mag Jmag Synthetic 2MASS J magnitude
231-235 F5.3 mag e_Jmag Error on Jmag
237-242 F6.3 mag Hmag Synthetic 2MASS H magnitude
244-248 F5.3 mag e_Hmag Error on Hmag
250-255 F6.3 mag Ksmag Synthetic 2MASS Ks magnitude
257-261 F5.3 mag e_Ksmag Error on Ksmag
263-268 F6.3 mag Gmag Synthetic Gaia G magnitude
270-274 F5.3 mag e_Gmag Error on Gaia
276-281 F6.3 mag BPmag Synthetic Gaia Gbp magnitude
283-287 F5.3 mag e_BPmag Error on BP
289-294 F6.3 mag RPmag Synthetic Gaia Grp magnitude
296-300 F5.3 mag e_RPmag Error on RP
302-309 F8.5 10pW/m2 Fbol0 [0.02/23]? Model inferred Bolometric Flux
311-317 F7.5 10pW/m2 e_Fbol0 [0.0004/0.3]? Error on ModFbol
319-322 I4 K Teff0 [2808/4197]? Model inferred effective
temperature
324-325 I2 K e_Teff0 [7/72]? Error on ModTeff
327-332 F6.4 Rsun R0 [0.13/0.661]? Model inferred Stellar Radius
334-339 F6.4 Rsun e_R0 [0.002/0.03]? Error on ModR
341-346 F6.4 Msun M0 [0.1/0.72]? Model inferred Stellar Mass
348-353 F6.4 Msun e_M0 [0.002/0.03]? Error on ModM
355-358 F4.2 [yr] Age0 [9.33/9.55]? Model inferred Age
360-363 F4.2 [yr] e_Age0 [0.48/0.63]? Error on ModAge
365-370 F6.3 --- chi2 [0/29]? χ2 for model comparison
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Note (1): Catalog abbreviations are:
PM IHHMMm+DDMMW : from LG11 (Lepine and Caidos 2011, J/AJ/142/138) or
CONCH-SHELL (Gaidos et al. 2014, J/MNRAS/443/2561)
LSPM JHHMM+DDMMW : from Lepine et al. 2005AJ....129.1483L 2005AJ....129.1483L, Cat. I/298
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Acknowledgements:
Andrew Mann,
Prepared with help from http://authortools.aas.org/MRT/upload.html built
by Greg Schwarz [AAS].
(End) Andrew Mann [UT Austin], Patricia Vannier [CDS] 01-Jun-2015