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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.
| A finding list of early-type stars near the south galactic pole.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971AJ.....76..338S&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Scultore |
| Ascensione retta: | 23h45m52.73s |
| Declinazione: | -32°55'37.8" |
| Magnitudine apparente: | 8.183 |
| Distanza: | 325.733 parsec |
| Moto proprio RA: | 3.9 |
| Moto proprio Dec: | 2.8 |
| B-T magnitude: | 8.405 |
| V-T magnitude: | 8.202 |
Cataloghi e designazioni:
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