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A study of B-type supergiants with the uvby,beta photometric system
The applicability of the uvby,beta photometric system to theclassification and study of B-type supergiants (BTS) is investigatedusing published data on 157 BTS and observations of 17 BTS made with the36-in. reflector at McDonald Observatory. The results are presented intabular form and analyzed to produce preliminary calibrations ofluminosity class vs. beta index and of absolute magnitude (Mv) vs. beta(or delta Mv vs. delta beta) for four associations of stars. Theeffectiveness of various color indices as temperature indicators isdiscussed. It is shown that there is good correspondence between MK anduvby,beta classifications of B-type main-sequence stars, giants, andBTS, confirming the usefulness of the uvby,beta system in furtherresearch on BTS.
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Observation and Astrometry data
| Constellation: | Ophiucus |
| Right ascension: | 17h53m54.94s |
| Declination: | +07°00'38.7" |
| Apparent magnitude: | 10.255 |
| Proper motion RA: | -3.3 |
| Proper motion Dec: | 1.1 |
| B-T magnitude: | 10.779 |
| V-T magnitude: | 10.299 |
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