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HD 144637


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Absolute luminosity calibration of Stroemgren's 'intermediate group'
A relation defining the luminosity index for Stroemgren's (1966)intermediate group (A0 to A3 stars) in terms of absolute magnitude iscalibrated using a method based on the principle of maximum likelihood.This relation is also calibrated for the case when the 'a' index iscorrected for reddening. For both relations, calculations are made ofthe magnitude dispersion, the mean velocity components and correspondingdispersion, and the precision of each parameter. The results are shownto be in fairly good agreement with Stroemgren's (1966) values, and arelation incorporating the corrected 'a' index is proposed formain-sequence stars. The absolute magnitudes obtained with a relation ofthe present type are compared with those derived from trigonometricparallaxes and with those obtained by Eggen (1972).

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Observation and Astrometry data

Constellation:Skorpion
Right ascension:16h07m13.30s
Declination:-10°19'28.7"
Apparent magnitude:9.747
Proper motion RA:-34.5
Proper motion Dec:-27
B-T magnitude:10.483
V-T magnitude:9.808

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 144637
TYCHO-2 2000TYC 5616-1127-1
USNO-A2.0USNO-A2 0750-09440427
HIPHIP 78965

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