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HD 19803


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The MK classification and its calibration
The system of spectral classification is described as it has developedfrom the original Yerkes Atlas (Morgan, Keenan, Kelman 1943) untiltoday. The word 'developed' is used because any system that is to remainuseful must be flexible enough to adapt not only to improved techniquesof measurement but also to new theoretical insights into the variablesthat actually determine the energy spectrum of a star in all itsfascinating but sometimes frustrating detail. The discussion does notconsider the criteria of classification but is confined to the resultingset of temperature types and luminosity classes. Chemical composition isexamined as a third variable. Tabulated and plotted informationincludes: MK temperature subclasses; lists of MK types of fainter stars;published calibrations of luminosity classes for early-type stars;calibration of MK luminosity classes for types later than F8; thedistribution among groups of the 426 stars in the author's current listof best types; and the effects of metal deficiencies on spectra of KOIII stars. The revised MK classification can be applied to all but a fewpercent of the stars later in type than GO. For the two-thirds of thesethat have approximately solar composition no abundance index is needed;for most of the remainder one abundance index suffices.

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Observation and Astrometry data

Constellation:Ηριδανός
Right ascension:03h10m41.73s
Declination:-15°26'10.2"
Apparent magnitude:8.524
Distance:409.836 parsecs
Proper motion RA:16.8
Proper motion Dec:0.2
B-T magnitude:10.096
V-T magnitude:8.654

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 19803
TYCHO-2 2000TYC 5865-224-1
USNO-A2.0USNO-A2 0675-01090094
HIPHIP 14772

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