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Photoelectric filter photometry of the flux depression at 5200 A in Ap-stars
A new photometric index was used to characterize the flux depression at5200 A in a photoelectric filter photometric study of a large number ofnormal A-stars, Ap-stars, Am-stars, and Hg-Mn-stars. The new index isdefined as a = g - (h + y)/2, where g and h are the brightnesses at 5240and 5020 A, respectively, measured by interference filters, and y is thebrightness measured with a Stromgren filter. The index reveals a markedcontrast between normal and peculiar stars.
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Observation and Astrometry data
| Constellation: | Hydre |
| Right ascension: | 09h22m03.65s |
| Declination: | -09°54'16.6" |
| Apparent magnitude: | 8.396 |
| Distance: | 200.401 parsecs |
| Proper motion RA: | -17.9 |
| Proper motion Dec: | 3.7 |
| B-T magnitude: | 8.565 |
| V-T magnitude: | 8.41 |
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