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The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation
The MK spectral classification for late A-type stars is refined and theeffects of rotation of spectral classification and uvby(beta) photometryfor these stars are examined. It is found that, for A3 stars, the4417/4481 A wavelength ratio produces results that are inconsistent withthe Stark broadening of the H lines. It is suggested that this ratio isnot useful as a luminosity criterion at any spectral type.Self-consistent sequences of narrow- and broadline standards areestablished. The results of the refined classification system arecompared with Stromgren photometry, showing a set of low-v sin i A-typestars with anomalously large delta(c1) indices for theirluminosity types. It is proposed that these stars are rapid rotatorsseen at fairly low inclination angles.
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Observation and Astrometry data
| Constellation: | Ιχθύς Νότιος |
| Right ascension: | 22h48m40.82s |
| Declination: | -34°46'23.1" |
| Apparent magnitude: | 7.698 |
| Distance: | 170.358 parsecs |
| Proper motion RA: | -12.7 |
| Proper motion Dec: | 4.4 |
| B-T magnitude: | 7.865 |
| V-T magnitude: | 7.712 |
Catalogs and designations:
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