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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: | Grus |
| Right ascension: | 23h24m26.61s |
| Declination: | -37°12'03.4" |
| Apparent magnitude: | 7.342 |
| Distance: | 250 parsecs |
| Proper motion RA: | -10.6 |
| Proper motion Dec: | -5.1 |
| B-T magnitude: | 7.477 |
| V-T magnitude: | 7.354 |
Catalogs and designations:
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