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J/other/AstBu/72.51  LAMOST stars radii, masses, luminosities (Sichevskij, 2017)

Estimates of the radii, masses, and luminosities of LAMOST stars. Sichevskij S.G. <Astrophys. Bull., 72, 51-57 (2017)> =2017AstBu..72...51S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, diameters ; Stars, masses ; Stars, luminous Keywords: stars: fundamental parameters - methods: statistical - techniques: spectroscopic Abstract: Based on the spectral observations of the LAMOST (DR2) survey, the radii, masses, and luminosities of 700480 stars were estimated. These stars belong to spectral types A, F, G, and K, and have metallicities between -0.845 and 0.0. To determine the properties of the stars, we used up-to-date modelsof the stellar interior structure, computed with account for the stellar evolution rate and the initial mass function. The use of evolutionary estimates for two types of stars - with and without rotation - allowed us to account for the uncertainty associated with the lack of data on the rotation velocity of the stars under consideration. The obtained stellar radii, together with the photometric estimates of interstellar extinction and angular diameters can be used to study the dependence of interstellar extinction on distance as well as to estimate the stellar distances. Description: File table1 contains estimates of the radii, masses, and luminosities for stars of spectral types A, F, G, and K from the LAMOST DR2 survey and the confidence coefficient values (Kd), which allow us to characterize the quality of the interval estimates: the closer Kd is to one, the greater the confidence in the interval estimate. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 166 700480 Estimates of the radii, masses, and luminosities for A, FGK-type stars from the LAMOST DR2 catalog
See also: V/149 : LAMOST DR2 catalogs (Luo+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 I9 --- specId LAMOST unique Spectra ID 11- 29 A19 --- Target Target Designation (JHHMMSS.ss+DDMMSS.s) 31- 44 F14.10 deg RAdeg Right Ascension (J2000) 46- 58 F13.10 deg DEdeg Declination (J2000) 60- 63 I4 K Teff Effective temperature (1) 65- 67 I3 K e_Teff Uncertainty of Effective temperature 69- 73 F5.3 [cm/s2] logg Surface gravity (1) 75- 79 F5.3 [cm/s2] e_logg Uncertainty of Surface gravity 81- 86 F6.3 [-] [Fe/H] Metallicity (1) 88- 92 F5.3 [-] e_[Fe/H] Uncertainty of Metallicity 94- 97 I4 K Teffu Uncorrected Effective temperature (2) 99-103 F5.3 [cm/s2] loggu Uncorrected Surface gravity (2) 105-110 F6.3 [-] [Fe/H]u Uncorrected Metallicity (2) 112-116 F5.2 Rsun Rad Radius 118-122 F5.2 Rsun RadQ1 Lower limit of Radius 124-128 F5.2 Rsun RadQ3 Upper limit of Radius 130-133 F4.2 Msun Mass Mass 135-138 F4.2 Msun MassQ1 Lower limit of Mass 140-143 F4.2 Msun MassQ3 Upper limit of Mass 145-149 F5.2 [Lsun] Lum Luminosity 151-155 F5.2 [Lsun] LumQ1 Lower limit of Luminosity 157-161 F5.2 [Lsun] LumQ3 Upper limit of Luminosity 163-166 F4.2 --- Kd [0/1] Confidence coefficient (3)
Note (1): The atmospheric characteristics of a star (temperature, surface gravity, and metallicity) were corrected with account for the empirical dependences obtained by the authors of the paper (Wang et al., 2016AJ....152....6W, Cat. J/AJ/152/6) Note (2): The atmospheric characteristics of a star (temperature, surface gravity, and metallicity) from LAMOST DR2 catalogs (Luo et al., 2016, Cat. V/149) Note (3): Confidence coefficient (Kd) allows us to characterize the quality of the interval estimates: the closer Kd is to one, the greater the confidence in the interval estimate. For example, Kd=0.5 means that only 50% of the atmospheric properties of the star, generated to compute the interval estimate, fall into the range of evolutionary estimates, and in the case of Kd=1.0, 100% will be within the mentioned range.
Acknowledgements: Sergej Sichevskij, s.sichevskij(at)gmail.com
(End) Sergej Sichevskij [INASAN], Patricia Vannier [CDS] 20-Mar-2017
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