A comparison between two-dimensional classifications from Vilnius photometry and those on the MK system

Details A comparison between two-dimensional classifications from Vilnius photometry and those on the MK system A comparison between two-dimensional classifications from Vilnius photometry and those on the MK system

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186..114c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. 114-119.

Astronomy and Astrophysics

Astrophysics

1

Astronomical Photography, Astronomical Photometry, Classifying, Galactic Structure, Stellar Spectra, Early Stars, Electrophotometry, Interstellar Extinction, Stellar Luminosity

Scientific paper

A feasibility study (Smriglio et al., 1986) for a planned galactic structure survey has used seven-colour photographic photometry in the Vilnius system to determine automatically two-dimensional stellar classifications for a region in Lyra. Twenty-three of these predicted classifications are now tested against MK classifications from digital slit spectra. Stars later than G0 agreed to 79% in type and to 86% in luminosity class. However, in the A to F region the predicted types were much earlier than the MK types. To investigate this failure, the photographic photometry was compared with photoelectric Vilnius photometry (Janulis, 1986) for the 28 stars common to both photometric studies. Save for a small (0.08) shift in the (U-P) index, the photographic results followed the photoelectric ones within the expected errors, and the photometric classes, determined respectively by the automatic and a non-automatic method, also agreed well. However, a new, non-automatic determination of the photometric classes for seven problem stars revealed that the derived classifications are sensitive to which diagrams relating photometric indices to spectral class are favoured.

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