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HD 174029


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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.

Spectral types of stars with unusual photometric indices
The Kitt Peak 2.1-m Cassegrain spectrograph was used to obtain spectraof 92 A5-G0 stars measured by Olsen in the Stromgren four-color systemand predicted to be abnormal in the sense of excessive reddening, highluminosity, or abnormal composition. Of the five stars predicted to bereddened B or A stars, four were indeed such while for the fifth Olsenobserved the blended components. Of twelve stars predicted to besupergiants, one is a supergiant, four are giants, two are subgiants,three are Ap stars, and two are Am stars. Thus photometrically predictedsupergiants are actually stars above main sequence in two out of threecases but mostly much less luminous than expected. Of ten predictedweak-lined stars, only two were found to be really so. Am stars werewell predicted, though detection is contaminated with Ap and luminousstars. It is concluded that four-color photometry is useful in selectinginteresting stars, but is often unable to tell the specific type ofabnormality present.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Kalkan
Sað Açýklýk:18h48m59.39s
Yükselim:-13°54'18.2"
Görünürdeki Parlaklýk:7.812
Uzaklýk:240.385 parsek
özdevim Sað Açýklýk:15.1
özdevim Yükselim:-23.2
B-T magnitude:8.22
V-T magnitude:7.846

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 174029
TYCHO-2 2000TYC 5705-1234-1
USNO-A2.0USNO-A2 0750-14761640
HIPHIP 92323

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