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HD 30187 B and HD 39927 B: two suspected nearby hot subdwarfs in resolved binaries
In doing a B_T, V_T photometric solution for close Hipparcos doublestars, based on the observations with the Tycho instrument of theHipparcos satellite, we discovered two very blue subluminous componentsof HD 30187 and HD 39927. The position of the components on anobservational HR diagram implies their being sdO or sdB hot subdwarfs.The only previously known sdO component of a visual binary, HD 113001 B,is also confirmed by our photometric data. The two new candidate hotsubdwarfs have parallaxes 8.25 and 10.17 mas, respectively, and withangular separations of about 0.35 arcsec, the orbital periods must be ofthe order of 100 years. This should make it possible to determine theirmasses from observation. Based on observations made with the ESAHipparcos satellite.
| Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.
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Osservazione e dati astrometrici
| Costellazione: | Orione |
| Ascensione retta: | 05h55m24.89s |
| Declinazione: | -04°49'32.2" |
| Magnitudine apparente: | 7.068 |
| Distanza: | 107.296 parsec |
| Moto proprio RA: | -12 |
| Moto proprio Dec: | -28.8 |
| B-T magnitude: | 7.221 |
| V-T magnitude: | 7.081 |
Cataloghi e designazioni:
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