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The Perkins catalog of revised MK types for the cooler stars
A catalog is presented listing the spectral types of the G, K, M, and Sstars that have been classified at the Perkins Observatory in therevised MK system. Extensive comparisons have been made to ensureconsistency between the MK spectral types of stars in the Northern andSouthern Hemispheres. Different classification spectrograms have beengradually improved in spite of some inherent limitations. In thecatalog, the full subclasses used are the following: G0, G5, G8, K0, K1,K2, K3, K4, K5, M0, M1, M2, M3, M4, M5, M6, M7, and M8. Theirregularities are the price paid for keeping the general scheme of theoriginal Henry Draper classification.
| UBV photometry of stars whose positions are accurately known.
Photometric indices V, B-V, and U-B were measured for about 560 stars ofthe AGK3R and NPZT catalogs between BD declinations 11 deg and 23 deg,using the 40-cm Cassegrain telescope of the Kvistaberg Observatory fromApril 1986 to May 1987. The observation procedure and the reductiontechnique were the same as in the earlier papers of this series by Oja(1984, 1985, 1986, and 1987). The mean errors were calculated from theinternal consistency of the data. The accuracy was found to be the sameas for the earlier parts of the survey.
| Recognition and classification of strong-CN giants
Fifty of the stars designated as super-metal-rich by Spinrad and Taylor(1969) are classified here on the Revised MK System. Positive CN indicesare assigned in recognition of the characteristic excesses of carbon andnitrogen in their atmospheres, as compared to normal Population I stars.For only a few of the stars, an abnormal strength of the iron lines orof Ca 4226 A is so noticeable that they need to be distinguished bypositive indices for these metals.
| Revised MK Spectral Standard Stars Later than G0
Not Available
| Spectral classification of carbon stars by means of photoelectric photometry of line strengths.
Abstract image available at:http://adsabs.harvard.edu/abs/1977PASJ...29..731Y
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Osservazione e dati astrometrici
| Costellazione: | Leone |
| Ascensione retta: | 10h07m23.52s |
| Declinazione: | +13°55'38.3" |
| Magnitudine apparente: | 9.18 |
| Moto proprio RA: | 3.8 |
| Moto proprio Dec: | -2.2 |
| B-T magnitude: | 11.056 |
| V-T magnitude: | 9.335 |
Cataloghi e designazioni:
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