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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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Observation and Astrometry data
| Constellation: | Coma Berenices |
| Right ascension: | 13h25m57.12s |
| Declination: | +22°05'10.6" |
| Apparent magnitude: | 10.745 |
| Proper motion RA: | -8.8 |
| Proper motion Dec: | -19.6 |
| B-T magnitude: | 10.786 |
| V-T magnitude: | 10.749 |
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