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HD 16852


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The stellar temperature scale for stars of spectral types from O8 to F6 and the standard deviation of the MK spectral classification
Empirical effective temperature of 211 early-type stars found in aprevious investigation (Kontizas and Theodossiou, 1980; Theodossiou,1985) are combined with the effective temperatures of 313 early-typestars from the literature. From these effective temperatures of a totalnumber of 524 early-type stars of spectral types from O8 to F6 a newstellar temperature scale is developed along with the standard deviationof the MK spectral classification.

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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Observation and Astrometry data

Constellation:Ωρολόγιον
Right ascension:02h39m39.85s
Declination:-59°34'03.0"
Apparent magnitude:7.57
Distance:212.766 parsecs
Proper motion RA:17.6
Proper motion Dec:0
B-T magnitude:8.713
V-T magnitude:7.665

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 16852
TYCHO-2 2000TYC 8490-1223-1
USNO-A2.0USNO-A2 0300-00783595
HIPHIP 12401

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