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SANTIAGO 91, a right ascension catalogue of 3387 stars (equinox J2000).
The positions in right ascension of 3387 stars belonging to the Santiago67 Catalogue, observed with the Repsold Meridian Circle at Cerro Calan,National Astronomical Observatory, during the period 1989 to 1994, aregiven. The average mean square error of a position, for the wholeCatalogue, is +/-0.009 s. The mean epoch of the catalogue is 1991.84.
| Behaviour of OI triplet 7773 A. II - AP stars
The behavior of the O I triplet at 7773 A in a sample of 74 Ap stars isanalyzed and compared with the results derived for a set of 50 normalstars. These abundance determinations are made in the NLTE frame byintroducing a correction to the LTE model atmosphere. Among the Apstars, the oxygen abundance varies greatly from one group to another andshows a clear separation between the different classes of peculiarities.An underabundance of up to a factor 400 is found for the (Sr-Cr-Eu)stars.
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Osservazione e dati astrometrici
| Costellazione: | Macchina Pneumatica |
| Ascensione retta: | 10h24m01.29s |
| Declinazione: | -31°31'46.2" |
| Magnitudine apparente: | 8.708 |
| Distanza: | 309.598 parsec |
| Moto proprio RA: | -1.8 |
| Moto proprio Dec: | -8.7 |
| B-T magnitude: | 10.092 |
| V-T magnitude: | 8.823 |
Cataloghi e designazioni:
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