Spectroscopic determinations of Rubidium abundances were conducted by applying the spectrum fitting method to Rb I 7800 line for an extensive sample ~500 late-type dwarfs as well giants (including Hyades cluster stars) belonging galactic disk population, with aim establishing behaviour [Rb/Fe] ratio stars in metallicity range -0.6<[Fe/H]<+0.3. An inspection resulting revealed that they show a s...

Context. Rubidium is one of the few elements produced by neutron capture s - and r -processes in almost equal proportions. Recently, a Rb deficiency ([Rb/Fe] &lt; 0.0), amounting to factor about two with respect Sun, has been found M dwarfs near-solar metallicity. This stands contrast close-to-solar [Sr, Zr/Fe] ratios derived same stars. difficult understand from point view observations nucleos...