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HD 70550


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UVBY H-beta photometry of UV-bright stars
uvby H-beta photometry is presented for 90 stars taken from an earlyversion of the Carnochan and Wilson (1983) catalogue of stars that havevery negative UV colors. Two have definite UV excesses (HD 36629, and HD81307). Four early-B stars have UV colors too positive for their visibleclassification, and beta-indices that indicate higher luminosities thanappear possible on galactic distribution grounds. Six late-B starsappear to have discordant flux distributions for which there are noobvious explanations. It is suggested that the high population ofsubluminous stars derived by Carnochan and Wilson is the product of thestatistical treatment used and the extreme patchiness in theinterstellar absorption, which gives rise to large numbers oflittle-reddened stars.

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Osservazione e dati astrometrici

Costellazione:Idra
Ascensione retta:08h22m15.67s
Declinazione:-09°07'23.0"
Magnitudine apparente:8.501
Distanza:333.333 parsec
Moto proprio RA:-8.7
Moto proprio Dec:2.4
B-T magnitude:8.418
V-T magnitude:8.495

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 70550
TYCHO-2 2000TYC 5427-1800-1
USNO-A2.0USNO-A2 0750-06106925
HIPHIP 41021

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