Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-06
Astronomy and Astrophysics
Astrophysics
5 pages, 1 colour figure, contribution talk given at the Cefalu' 2007 Workshop "XXI Century Challenges for Stellar Evolution".
Scientific paper
In the context of dwarf spheroidal galaxies it is hard to firmly disentangle a genuine Blue Stragglers (BSS) population from a normal young main (MS) sequence. This difficulty is persistent. For a sample of 9 non-star forming Local Group dwarf galaxies we compute the ``BSS frequency'' and compare it with that found in the Milky Way globular/open clusters and halo. The comparison shows that the BSS-frequency in dwarf galaxies, at any given Mv, is always higher than that in globular clusters of similar luminosities. Moreover, the estimated BSS-frequency for the lowest luminosity dwarf galaxies is in excellent agreement with that observed in the Milky Way halo and open clusters. We conclude that the low density, almost collision-less environment, of our dwarf galaxy sample point to their very low dynamical evolution and consequent negligible production of collisional BSS.
Gullieuszik Marco
Held Enrico V.
Momany Yazan
Rizzi Luca
Saviane Ivo
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