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Swedish Programmes Concerning the Z Distribution of Stars

Published online by Cambridge University Press:  30 March 2016

Tarmo Oja
Tarmo Oja*
Affiliation:
Astronomical Observatory, Uppsala, Sweden

Extract

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Swedish investigations on stellar space distribution generally are based on the Uppsala - Stockholm spectral classification system. In this system the properties of the stars are derived from objective prism spectra by means of narrow-band photometry. The main criteria are the hydrogen-line intensities, the intensity of the K line, the intensity of the G band, the break at the G band, and the intensity of the blue cyanogen band (for a description of the system see e.g. Ljunggren and Oja, 1961), when possible supplemented by a measure of the Balmer discontinuity (Rydström, 1976). The method yields absolute magnitudes with a dispersion of about and intrinsic colours (B-V)° with a mean error below for most kinds of stars.

Three investigations are relevant to the subject of this Joint Discussion.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 4 , Issue 2: Highlights of Astronomy. As presented at the XVIth General Assembly of the IAU, 1976 (Part II) , 1977 , pp. 69
Copyright
Copyright © Reidel 1977

References

Elvius, T. and Lodén, K. 1960, Stockholm Obs. Ann. 21, N:o 2.Google Scholar
Häggkvist, L. and Oja, T. 1973, Astron. Astrophys. Suppl. 12, 381.Google Scholar
Ljunggren, B. and Oja, T. 1961, Uppsala Astr. Obs. Ann. 4, N:o 10.Google Scholar
Rydström, B. 1976, Uppsala Astr. Obs. Rep. N:o 8.Google Scholar