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J/ApJ/518/859    Revision of MK luminosity classes        (Keenan+, 1999)

Revision and calibration of MK luminosity classes for cool giants by HIPPARCOS parallaxes Keenan P.C., Barnbaum C. <Astrophys. J. 518, 859 (1999)> =1999ApJ...518..859K
ADC_Keywords: MK spectral classification ; Parallaxes, trigonometric ; Spectral types ; Stars, late-type ; Stars, standard Keywords: astrometry - standards - stars: fundamental parameters Abstract: The Hipparcos parallaxes of cool giants are utilized in two ways in this paper. First, a plot of reduced parallaxes of stars brighter than 6.5, as a function of spectral type, for the first time separates members of the clump from stars in the main giant ridge. A slight modification of the MK luminosity standards has been made so that luminosity class IIIb defines members of the clump, and nearly all of the class III stars fall within the main giant ridge. Second, a new calibration of MK luminosity classes III and IIIb in terms of visual absolute magnitudes has been made. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 76 142 Revised MK types for cool stars
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) III/150 : Perkins Revised MK Types for the Cooler Stars (Keenan+ 1989) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 18 A18 --- Name Star name 20- 24 I5 --- HD Henry Draper catalog number 26- 29 F4.2 mag Vmag V band magnitude 31 A1 --- f_Vmag [v] Indicates a variable star 33 I1 h RAh Right Ascension (J2000) 35- 38 F4.1 min RAm Right Ascension (J2000) 40 A1 --- DE- Declination (J2000) 41- 42 I2 deg DEd Declination (J2000) 45- 46 I2 arcmin DEm Declination (J2000) 50- 63 A14 --- Class Spectral and Luminosity type 65 A1 --- f_Class Indicates star is not a reliable standard for stars of normal solar composition 69- 72 I4 10-5arcsec Para Reduced parallax (x10-5) 74- 76 I3 10-5arcsec e_Para Uncertainty in Para
History: From ApJ electronic edition March 2000: Parallax of 81 Gem changed from I800 to 1800.
(End) Greg Schwarz [AAS] 08-Mar-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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