SIMBAD references

2018ApJ...859...98Y - Astrophys. J., 859, 98-98 (2018/June-1)

New insights into the formation of the blue main sequence in NGC 1850.

YANG Y., LI C., DENG L., DE GRIJS R. and MILONE A.P.

Abstract (from CDS):

Recent discoveries of bimodal main sequences (MSs) associated with young clusters (with ages <=1 Gyr) in the Magellanic Clouds have drawn a lot of attention. One of the prevailing formation scenarios attributes these split MSs to a bimodal distribution in stellar rotation rates, with most stars belonging to a rapidly rotating population. In this scenario, only a small fraction of stars populating a secondary blue sequence are slowly or non-rotating stars. Here, we focus on the blue MS in the young cluster NGC 1850. We compare the cumulative number fraction of the observed blue-MS stars to that of the high-mass-ratio binary systems at different radii. The cumulative distributions of both populations exhibit a clear anti-correlation, characterized by a highly significant Pearson coefficient of -0.97. Our observations are consistent with the possibility that blue-MS stars are low-mass-ratio binaries, and therefore their dynamical disruption is still ongoing. High-mass-ratio binaries, on the other hand, are more centrally concentrated.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): globular clusters: individual: NGC 1850 - Hertzsprung-Russell and C-M diagrams - Magellanic Clouds

Simbad objects: 9

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2019.10.16-20:29:41

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