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Spectrophotometry of peculiar B and A stars. I - On the detection of the lambda 4200 and lambda 5200 broad, continuum features of peculiar A stars
Photometric indices are used to study the broad continuum features thatare present in the energy distributions of many peculiar A stars andthat may be indicators of the atmospheric structure. Indices derivedfrom representative or averages of spectrophotometric scans areconsidered. Values of Maitzen's (1976) delta-a index - a measure of thelambda 5200 feature - are synthetized from spectrophotometric data. Twoother specific indices are calculated from spectrophotometry to measurethe strength of lambda 4200 feature. The details of the photometricvariability are presented with the data. Possible effects of thevariability on the conclusions made are discussed.
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Observation and Astrometry data
| Constellation: | Hercules |
| Right ascension: | 18h27m52.35s |
| Declination: | +14°42'18.6" |
| Apparent magnitude: | 8.297 |
| Proper motion RA: | 16.8 |
| Proper motion Dec: | 2.4 |
| B-T magnitude: | 10.055 |
| V-T magnitude: | 8.443 |
Catalogs and designations:
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