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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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观测天体数据

星座:天蠍座
右阿森松:16h07m13.30s
赤纬:-10°19'28.7"
视星:9.747
右阿森松适当运动:-34.5
赤纬适当运动:-27
B-T magnitude:10.483
V-T magnitude:9.808

目录:
适当名称
HD 1989HD 144637
TYCHO-2 2000TYC 5616-1127-1
USNO-A2.0USNO-A2 0750-09440427
HIPHIP 78965

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