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Density Law, Vertical Distribution and Vertical Gradient of Metal Abundances for G and K Giants

Published online by Cambridge University Press:  30 March 2016

M. Grenon
M. Grenon*
Affiliation:
Observatoire de Genève

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A systematic photometric investigation on stars of spectral type G4 to K4 is performed in both polar caps in symmetric coaxial cones. According to a calibration of the Geneva system, Mv, Teff and [M/H] ratio have been now derived for about 4OO stars. For the computation of density law, a special care has been taken to avoid selection biaises related to variations of mean age or metal abundance. A change of luminosity function for evolved stars in function of z has been detected. Using the geometrical properties of the cones and direct counts in the solar vicinity, we derive the following density law for stars with Mv ∊ [0.0, 1.3] and (B-V) ∊ [0.7, 1.3]

References

Oort, J. H. 1932, B.A.N., 6, 249 Google Scholar
Elvius, T. 1951, Stock. Obs. Ann. 16, 1951 Google Scholar
Upgren, A. R. 1962, A.J. 67, 37 CrossRefGoogle Scholar
Grenon, M. 1972, U.A.I. Coll. 17., LV Google Scholar
Blaauw, A. 1975, Proc. 3d Europ. Astr. Meet., Tbilisi, 351Google Scholar
Jennens, P. A. 1975, MNRAS 172, 301 Google Scholar
Mayor, M. 1976, Astron. & Astrophys. 48; 301 Google Scholar