Star clusters with dual red clumps

Details Star clusters with dual red clumps Star clusters with dual red clumps

2009-10-16

arxiv.org/abs/0910.3139v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

contributed talk at IAUS 266 'Star clusters: basic galactic building blocks', eds R. de Grijs and J. Lepine. A high resolution

Scientific paper

A few star clusters in the Magellanic Clouds exhibit composite structures in the red-clump region of their colour-magnitude diagrams. The most striking case is NGC419 in the SMC, where the red clump is composed of a main blob as well as a distinct secondary feature. This structure is demonstrated to be real and corresponds to the simultaneous presence of stars which passed through electron degeneracy after central-hydrogen exhaustion and those that did not. This rare occurrence in a single cluster allows us to set stringent constraints on its age and on the efficiency of convective-core overshooting during main-sequence evolution. We present a more detailed analysis of NGC419, together with a first look at other populous LMC clusters which are apparently in the same phase: NGC1751, NGC1783, NGC1806, NGC1846, NGC1852 and NGC1917. We also compare these Magellanic Cloud cases with their Galactic counterparts, NGC752 and NGC7789. We emphasise the extraordinary potential of these clusters as absolute calibration marks on the age scale of stellar populations.

Affiliated with

Also associated with

No associations

Rating

Star clusters with dual red clumps does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Star clusters with dual red clumps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Star clusters with dual red clumps will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-124138