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Early type high-velocity stars in the solar neighborhood. IV - Four-color and H-beta photometry
Results are presented from photometric obaservations in the Stromgrenuvby four-color and H-beta systems of early-type high-velocity stars inthe solar neighborhood. Several types of photometrically peculiar starsare selected on the basis of their Stromgren indices and areprovisionally identified as peculiar A stars, field horizontal-branchstars, metal-poor stars near the Population II and old-disk turnoffs,metal-poor blue stragglers, or metallic-line A stars. Numerousphotometrically normal stars were also found.
| Color excesses of classical cepheids. I
The color excesses of eleven cepheids have been determined with the aidof photometry of field stars found in the proximity of the variables. Acomparison of the color excesses with previous color-excess results isgiven. Four cepheids: RT Aur, DT Cyg, Zeta Gem, and T Vul, haverelatively small and well-established reddening values. These fourstars, along with Alpha UMi, can serve as standards to calibratereddening-free indices with intrinsic color indices such as (b-y) or(B-V).
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Membro dei seguenti gruppi:
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Osservazione e dati astrometrici
| Costellazione: | Aquila |
| Ascensione retta: | 18h59m26.21s |
| Declinazione: | +17°05'48.7" |
| Magnitudine apparente: | 9.006 |
| Distanza: | 294.985 parsec |
| Moto proprio RA: | 2.4 |
| Moto proprio Dec: | 2.6 |
| B-T magnitude: | 9.089 |
| V-T magnitude: | 9.013 |
Cataloghi e designazioni:
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