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Interstellar reddening in the Southern Hemisphere. I - The UVBY beta observations
The uvby-beta photometric data obtained from a Southern Hemisphereobservational project is presented. A uvby-beta photometric network ofnearly 3900 A and early F stars has been established with the intentthat the stars serve as 'space probes' for measurements of interstellarreddening.
| Visual multiples. VII - MK classifications
Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Tavsan |
| Sað Açýklýk: | 06h05m55.68s |
| Yükselim: | -13°14'52.0" |
| Görünürdeki Parlaklýk: | 7.194 |
| Uzaklýk: | 144.509 parsek |
| özdevim Sað Açýklýk: | 3.1 |
| özdevim Yükselim: | 1.7 |
| B-T magnitude: | 7.515 |
| V-T magnitude: | 7.221 |
Kataloglar ve belirtme:
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