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Inaccuracies in the spectral classification of stars from the Tycho-2 Spectral Type Catalogue
We compare the spectroscopic and trigonometric parallaxes of commonstars from the Tycho-2 Spectral Type and Hipparcos Catalogues. Thiscomparison has revealed that the distance estimations for theoverwhelming majority of stars by both methods yield very similarresults. However, there is a small fraction of stars for which thedistance estimates differ significantly. It is these stars that are thesubject of our study. We have been able to find the causes of thesedifferences.
| Dwarf K and M stars in the southern hemisphere.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972AJ.....77..486U&db_key=AST
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Observation and Astrometry data
| Constellation: | へび座 |
| Right ascension: | 18h40m42.05s |
| Declination: | -02°41'46.1" |
| Apparent magnitude: | 9.956 |
| Proper motion RA: | 32.2 |
| Proper motion Dec: | -15.4 |
| B-T magnitude: | 10.997 |
| V-T magnitude: | 10.042 |
Catalogs and designations:
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