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New UBVRI photometry for 900 supergiants
A description is presented of the results obtained in connection with asystematic program of supergiant photometry on the Johnson UBVRI system.During the eight years after the start of the program, almost 1000 starshave been observed, about 400 three or more times each. The originalselection of stars used the spectral type catalog of Jaschek et al.(1964) to choose supergiants. Since observations were possible from bothChile and Canada, no declination limits were imposed, and no particularselection criteria were imposed other than to eliminate carbon stars.These are so red as to require enormous extrapolations of thetransformation equations.
| Polarization measurements of 313 nearby stars
The linear polarization of 313 low galactic latitude stars has beenmeasured. With few exceptions all program stars have a spectral typelater than B9 and are within 600 parsec of the sun. 181 stars aresituated at the southern sky and 132 at the northern sky.
| Four Southern Photoelectric Sequences
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sonraki gruplarýn üyesi:
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Yelken |
| Sað Açýklýk: | 09h39m27.10s |
| Yükselim: | -54°15'54.5" |
| Görünürdeki Parlaklýk: | 7.834 |
| Uzaklýk: | 523.56 parsek |
| özdevim Sað Açýklýk: | -2.5 |
| özdevim Yükselim: | -5.7 |
| B-T magnitude: | 9.431 |
| V-T magnitude: | 7.966 |
Kataloglar ve belirtme:
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