2011ApJ...731L..37Y

Query : 2011ApJ...731L..37Y

2011ApJ...731L..37Y - Astrophys. J., 731, L37 (2011/April-3)

The contributions of interactive binary stars to double main-sequence turnoffs and dual red clump of intermediate-age star clusters.

YANG W., MENG X., BI S., TIAN Z., LI T. and LIU K.

Abstract (from CDS):

Double or extended main-sequence turnoffs (DMSTOs) and dual red clump (RC) were observed in intermediate-age clusters, such as in NGC 1846 and 419. The DMSTOs are interpreted as that the cluster has two distinct stellar populations with differences in age of about 200-300 Myr but with the same metallicity. The dual RC is interpreted as a result of a prolonged star formation. Using a stellar population-synthesis method, we calculated the evolution of a binary-star stellar population. We found that binary interactions and merging can reproduce the dual RC in the color-magnitude diagrams of an intermediate-age cluster, whereas in actuality only a single population exists. Moreover, the binary interactions can lead to an extended main-sequence turnoff (MSTO) rather than DMSTOs. However, the rest of the main sequence, subgiant branch, and first giant branch are hardly spread by the binary interactions. Part of the observed dual RC and extended MSTO may be the results of binary interactions and mergers.

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Journal keyword(s): binaries: general - galaxies: star clusters: general - globular clusters: general

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NGC 419 OpC 01 08 17.26 -72 53 01.8 11.41 11.16 10.50   9.34 ~ 287 0
3 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
4 NGC 1751 Cl* 04 54 12.91 -69 48 26.8   15.06 11.73     ~ 91 0
5 NGC 1783 GlC 04 59 08.590 -65 59 15.84   10.9 10.93     ~ 273 0
6 NGC 1806 GlC 05 02 11.180 -67 59 05.89   11.1       ~ 165 0
7 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 279 0
8 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 231 0
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
10 NGC 2173 GlC 05 57 58 -72 58.7   12.74 11.88     ~ 148 0
11 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
12 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
13 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0

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