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HD 24579


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Red and infrared colours of B stars and the reddening law in the Galaxy
The red and infrared intrinsic colours of B stars are derived fromphotometric observations through the UBV(RI)_CJHK and Hβ filters of257 early-type stars. Those stars for which the UBV and Hβmeasurements match the published spectral class, and which show no othersigns of peculiarity, are used to determine the intrinsic photometriccolours of B stars in the red and infrared. From these intrinsic coloursthe interstellar reddening relationships for the red and infraredcolours are evaluated, and the results are compared with previousestimates of these quantities. The values of R, E(B-V) and the distanceare then determined for the individual stars. R is confirmed to be closeto 3.1 in most cases, but was found to be much larger in somedirections. The relationship between R and the location of a star in theGalaxy is investigated. Usually the abnormally reddened stars seemed tobe associated with known regions of star formation. The paper alsoidentifies seven likely variable stars and a number of stars withpossible dust shells.

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Osservazione e dati astrometrici

Costellazione:Mensa
Ascensione retta:03h46m33.55s
Declinazione:-76°42'57.3"
Magnitudine apparente:8.057
Distanza:1098.901 parsec
Moto proprio RA:10.4
Moto proprio Dec:8.6
B-T magnitude:8.006
V-T magnitude:8.053

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 24579
TYCHO-2 2000TYC 9363-121-1
USNO-A2.0USNO-A2 0075-00618785
HIPHIP 17624

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