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Title:
The blue plume population in dwarf spheroidal galaxies: genuine blue stragglers or young stellar population?.
Authors:
Momany, Y.; Held, E. V.; Saviane, I.; Zaggia, S.; Rizzi, L.; Gullieuszik, M.
Affiliation:
AA( INAF: Oss. Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy ), AB(INAF: Oss. Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy), AC(European Southern Observatory, A. de Cordova 3107, Santiago, Chile), AD( INAF: Oss. Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy), AE(Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA), AF( INAF: Oss. Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy)
Publication:
Memorie della Societa Astronomica Italiana, v.79, p.618 (2008)
Publication Date:
00/2008
Origin:
MmSAI
Keywords:
Galaxies: dwarf, globular clusters: general, blue stragglers, stars: evolution
Bibliographic Code:
2008MmSAI..79..618M

Abstract

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'' (FBSSHB) and compare it with that found in the Milky Way globular/open clusters and halo. The comparison shows that FBSSHB in dwarf galaxies, at any given MV, is always higher than that in globular clusters of similar luminosities. Moreover, the estimated FBSSHB 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.

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