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Galactic clusters with associated Cepheid variables. III - NGC 1647 and SZ Tauri
Observational data and analysis are used to argue that the Cepheid Z Tauis an outlying member of the open cluster NGC 1647. The spatialcoincidence of the Cepheid with the cluster corona, as well ascoincidences in radial velocity, proper motion, and age with clustermembers, present a convincing case for cluster membership, which is alsosupported by independent estimates for the mean radius of SZ Tau. Theevidence presented by the derived luminosity of the Cepheid and itslight curve strongly indicates that SZ Tau is pulsating in the firstovertone, rather than fundamental, mode.
| Space reddenings for six Cepheid variables
Color excesses are derived for six galactic Cepheids from reddeningsfound for neighboring stars which seem likely to be physicallyassociated with each variable. The Cepheids studied are: SU Cas, whichis associated with a dust complex and R association; Zeta Gem and AlphaUMi, which have F dwarfs as close companions; BB Sgr and SZ Tau, whichlie in the coronal regions of the clusters Collinder 394 and NGC 1647,respectively; and SV Vul, which is involved in an older region of theassociation Vul OB1. The derived reddenings are in good agreement withother, independent, estimates from the literature.
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Observation and Astrometry data
| Constellation: | Taureau |
| Right ascension: | 04h38m31.67s |
| Declination: | +19°04'41.0" |
| Apparent magnitude: | 9.421 |
| Proper motion RA: | 1.3 |
| Proper motion Dec: | -0.7 |
| B-T magnitude: | 9.682 |
| V-T magnitude: | 9.443 |
Catalogs and designations:
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