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 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:
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FileName Lrecl Records Explanations
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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
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See also:
V/149 : LAMOST DR2 catalogs (Luo+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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)
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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 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.
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Acknowledgements:
Sergej Sichevskij, s.sichevskij(at)gmail.com
(End) Sergej Sichevskij [INASAN], Patricia Vannier [CDS] 20-Mar-2017