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New OB-Association in Pup - CMA
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| 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.
| Physical parameters of pulsating variables with periods between one and three days. I - Photometry and metallicities
Based on a new set of observations in the Walraven VBLUW system,obtained at the European Southern Observatory, La Silla, Chile,Fe/H(VBLU) values of 57 pulsating variables, mostly with periods betweenone and three days,. are determined. The distribution of the metalabundances is shown to be essentially bimodal. All the variables withFe/H ratios of less than -0.4 were classified by Diethelm (1983) as RRdstars. They are identified as the galactic field counterpart of theCepheids in the same period range found in globular clusters.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Buyuk Kopek |
| Sað Açýklýk: | 07h09m35.13s |
| Yükselim: | -19°06'55.9" |
| Görünürdeki Parlaklýk: | 7.989 |
| Uzaklýk: | 2439.024 parsek |
| özdevim Sað Açýklýk: | -5.1 |
| özdevim Yükselim: | 4 |
| B-T magnitude: | 7.891 |
| V-T magnitude: | 7.981 |
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