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The dwarf spheroidal galaxy in Draco. I - New BV photometry.
BV photoelectric photometry for 39 stars and BV photographic photometryfor 514 stars in the field of the Draco dwarf spheroidal galaxy arepresented. The color-magnitude diagram for 512 of these field stars isfound to display a well-defined red horizontal branch as well as a redgiant branch whose observed width is comparable to the accidentalphotometric error. The results also indicate that a more diffusesequence of stars lies about 0.1 mag to the blue of the giant branch andthat an upper horizontal branch of more massive core helium-burningstars may also be present. The foreground reddening toward Draco is thendetermined by narrow-band uvby-beta photometry of galactic B-A-F stars.
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Osservazione e dati astrometrici
| Costellazione: | Dragone |
| Ascensione retta: | 17h20m09.51s |
| Declinazione: | +51°40'32.0" |
| Magnitudine apparente: | 8.125 |
| Distanza: | 813.008 parsec |
| Moto proprio RA: | -4.5 |
| Moto proprio Dec: | -5.4 |
| B-T magnitude: | 9.513 |
| V-T magnitude: | 8.24 |
Cataloghi e designazioni:
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