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HD 213666


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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.

Estimation of spectral classifications for bright southern stars with interesting Stromgren indices
This paper investigates the degree of success with which uvby photometrycan be applied to predict spectral classifications for 947 A, F, and Gstars brighter than an apparent magnitude of 8.3 and with four-colorindices indicating some kind of interesting, unusual, or peculiarspectrum. One or several possible spectral classifications are estimatedfor each star from photometry alone, double stars are distinguished, andthe estimates are compared with published classifications. The resultsshow that the framework provided by uvby photometry can be extended toinclude most G and K stars, reddened stars, peculiar stars, and certaintypes of double star.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Guney Baligi
Sað Açýklýk:22h33m45.73s
Yükselim:-33°52'34.7"
Görünürdeki Parlaklýk:7.884
Uzaklýk:307.692 parsek
özdevim Sað Açýklýk:-26.2
özdevim Yükselim:-23.7
B-T magnitude:8.891
V-T magnitude:7.968

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 213666
TYCHO-2 2000TYC 7500-1147-1
USNO-A2.0USNO-A2 0525-43880029
HIPHIP 111371

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