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Four-colour and H-beta photometry of blue stars selected from a balloon-ultraviolet survey and other sources
New uvby and/or H-beta photometry is obtained at the Chiranhigh-altitude outstation for 105 stars. Certain of the program stars areselected from a comparison of the SCAP 2000 balloon-ultraviolet skysurvey of the Laboratoire d'Astronomie Spatiale with the correspondingblue and red prints of the Palomar Observatory sky survey. Only a smallportion of these stars turn out to be B stars, whereas, the rest of thestars, which are selected from a variety of other sources, are mostly Bstars and if of normal luminosity are in many cases many Population Iscale heights from the galactic plane. It is shown that theidentification of B stars is practicable only at a good observing siteand that if H-beta photometry is also obtained, sdOB, sdB, and hothorizontal branch B stars can be distinguished from normal stars bytheir position in the beta/c(0) diagram.
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| Сазвежђа: | Секстант |
| Ректацензија: | 10h16m16.93s |
| Deклинација: | -05°49'44.5" |
| Apparent магнитуда: | 7.793 |
| Даљина: | 432.9 parsecs |
| Proper motion RA: | -7.3 |
| Proper motion Dec: | -1.3 |
| B-T magnitude: | 7.722 |
| V-T magnitude: | 7.788 |
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