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HD 2970


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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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Observation and Astrometry data

Constellation:Phoenix
Right ascension:00h32m44.83s
Declination:-39°19'33.6"
Apparent magnitude:8.519
Distance:94.34 parsecs
Proper motion RA:-5.3
Proper motion Dec:-21.2
B-T magnitude:9.263
V-T magnitude:8.581

Catalogs and designations:
Proper Names
HD 1989HD 2970
TYCHO-2 2000TYC 7525-907-1
USNO-A2.0USNO-A2 0450-00190252
HIPHIP 2580

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