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HD 155522


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Colour excesses of F-G supergiants and Cepheids from Geneva photometry.
A reddening scale for F-G supergiants and Cepheids is presented.Supergiants with low reddenings or in clusters form the basis of thecalibration. In this sense, it is entirely empirical. The data have beenobtained in the Geneva photometric system. Comparisons with otherreddening scales show no disagreement. The only problem is with Fernie'sscale for Cepheids (1990), where a systematic trend exists. Its originis not clear. It is suggested to extend the number of supergiants withindependently obtained colour excesses in order to test the existence ofa possible luminosity dependence of the calibration. A period-colourrelation for Cepheids is deduced, on the basis of the present reddeningcorrections. It gives strong support for V473 Lyr being a secondovertone pulsator.

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观测天体数据

星座:南極座
右阿森松:17h45m52.05s
赤纬:-86°17'54.4"
视星:9.689
右阿森松适当运动:28.4
赤纬适当运动:-13.6
B-T magnitude:10.268
V-T magnitude:9.737

目录:
适当名称   (Edit)
HD 1989HD 155522
TYCHO-2 2000TYC 9530-206-1
USNO-A2.0USNO-A2 0000-01540773
HIPHIP 86937

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