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HD 201409


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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.

Photometry of F-K type bright giants and supergiants. I - Intermediate band and H-Beta observations
Over 1500 observations of 560 bright giants and supergiants of types F-Kare presented and compared to the observations by Gray and Olsen (1991).The present results include intermediate-band which is slightlydifferent from the Stromgren data by Gray and Olsen due to a differentwidth for the v filter. A systematic difference in m(1) - M(1) withdecreasing temperature is noted in the two H-Beta data sets, and thecorrelations are defined.

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Observation and Astrometry data

Constellation:Microscopium
Right ascension:21h10m20.90s
Declination:-32°51'00.6"
Apparent magnitude:7.236
Distance:255.754 parsecs
Proper motion RA:21.7
Proper motion Dec:0.8
B-T magnitude:8.446
V-T magnitude:7.336

Catalogs and designations:
Proper Names
HD 1989HD 201409
TYCHO-2 2000TYC 7476-806-1
USNO-A2.0USNO-A2 0525-43100048
HIPHIP 104523

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