/ftp/cats/J_AJ/121//2159



==========================================================================
J/AJ/121/2159       Basic parameters for 372 A, F & G stars       (Gray+, 2001)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
	table1.dat
==========================================================================
Query from: http://vizier.cds.unistra.fr/cgi-bin/VizieR?-source=J/AJ/121/2159
==========================================================================

drwxr-xr-x 45 cats archive 4096 Jan 29 2012 [Up] drwxr-xr-x 2 cats archive 243 Apr 8 2023 [TAR file] -rw-r--r-- 1 cats archive 470 Dec 19 2022 .message -r--r--r-- 1 cats archive 3308 Aug 22 2001 ReadMe -rw-r--r-- 1 cats archive 567 Sep 19 2007 +footg5.gif -rw-r--r-- 1 cats archive 4478 Mar 5 2008 +footg8.gif -r--r--r-- 1 cats archive 4038 Jun 26 2001 table1.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : J/AJ/121/2159 Basic parameters for 372 A, F & G stars (Gray+, 2001) ================================================================================ The physical basis of luminosity classification in the late A-, F-, and early G-type stars. II. Basic parameters of program stars and the role of microturbulence. Gray R.O., Graham P.W., Hoyt S.R. <Astron. J. 121, 2159 (2001)> =2001AJ....121.2159G ================================================================================ ADC_Keywords: Stars, late-type ; Reddening ; Abundances, [Fe/H] ; Effective temperatures Keywords: stars: abundances - stars: atmospheres - stars: fundamental parameters - stars: late-type - methods: data analysis - methods: numerical Abstract: Paper I (Cat. J/AJ/121/2148) of this series presented precise MK spectral types for 372 late A-, F-, and early G-type stars with the aim of understanding the nature of luminosity classification on the MK spectral classification system for this range of spectral types. In this paper, a multidimensional downhill simplex technique is introduced to determine the basic parameters of the program stars from fits of synthetic spectra and fluxes with observed spectra and fluxes from Strvmgren uvby photometry. This exercise yields useful calibrations of the MK spectral classification system but, most importantly, gives insight into the physical nature of luminosity classification on the MK spectral classification system. In particular, we find that in this range of spectral types, microturbulence appears to be at least as important as gravity in determining the MK luminosity type.