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HD 143685


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Five-colour photometry of early-type stars in the direction of galactic X-ray sources
The results of five-color (Walraven system) photometry of 551 O- andB-type stars located in 17 fields of a few square degrees aroundgalactic X-ray sources are presented. From a comparison ofreddening-free combinations of color indices with theoretical values,calculated for model atmospheres of Kurucz (1979), effective temperatureand surface gravity for these stars are derived. In addition theirabsolute magnitude are determined by combining these parameters with theresults of evolutionary calculations of massive stars. These effectivetemperatures are in good agreement with the temperature scale ofBohm-Vitense (1981) for stars of luminosity classes II to V. For thesupergiants the effective temperatures are about 40 percent higher. Forstars of luminosity classes III to V the absolute magnitudes agree wellwith the results of independent luminosity calibrations of spectraltypes, but for brighter stars they deviate systematically. Thephotometric data are also used to study the interstellar reddening inthe direction of the X-ray sources.

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Osservazione e dati astrometrici

Costellazione:Dragone
Ascensione retta:15h58m37.54s
Declinazione:+59°45'03.7"
Magnitudine apparente:8.742
Distanza:133.156 parsec
Moto proprio RA:8.2
Moto proprio Dec:-11.5
B-T magnitude:9.359
V-T magnitude:8.793

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 143685
TYCHO-2 2000TYC 3876-968-1
USNO-A2.0USNO-A2 1425-08411957
HIPHIP 78254

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