2021MNRAS.502.4350S

Query : 2021MNRAS.502.4350S

2021MNRAS.502.4350S - Mon. Not. R. Astron. Soc., 502, 4350-4358 (2021/April-2)

Binary-driven stellar rotation evolution at the main-sequence turn-off in star clusters.

SUN W., DE GRIJS R., DENG L. and ALBROW M.D.

Abstract (from CDS):

The impact of stellar rotation on the morphology of star cluster colour-magnitude diagrams is widely acknowledged. However, the physics driving the distribution of the equatorial rotation velocities of main-sequence turn-off stars is as yet poorly understood. Using Gaia Data Release 2 photometry and new Southern African Large Telescope medium-resolution spectroscopy, we analyse the intermediate-age (∼1- Gyr-old) Galactic open clusters NGC 3960, NGC 6134, and IC 4756 and develop a novel method to derive their stellar rotation distributions based on SYCLIST stellar rotation models. Combined with literature data for the open clusters NGC 5822 and NGC 2818, we find a tight correlation between the number ratio of slow rotators and the clusters' binary fractions. The blue-main-sequence stars in at least two of our clusters are more centrally concentrated than their red-main-sequence counterparts. The origin of the equatorial stellar rotation distribution and its evolution remains as yet unidentified. However, the observed correlation in our open cluster sample suggests a binary-driven formation mechanism.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): techniques: spectroscopic - galaxies: star clusters: general

Simbad objects: 22

goto Full paper

goto View the references in ADS

Number of rows : 22
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 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
2 NGC 419 OpC 01 08 17.26 -72 53 01.8 11.41 11.16 10.50   9.34 ~ 287 0
3 NGC 1245 OpC 03 14 44.3 +47 14 06   9.16 8.4     ~ 171 0
4 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 279 0
5 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 231 0
6 NGC 1856 Cl* 05 09 30.290 -69 07 45.08   10.40 10.06     ~ 163 0
7 NGC 1817 OpC 05 12 33.9 +16 41 34           ~ 210 0
8 NGC 1866 GlC 05 13 38.920 -65 27 52.75           ~ 437 0
9 M 37 OpC 05 52 18.6 +32 32 36           ~ 436 0
10 M 41 OpC 06 46 03.1 -20 43 07   4.89 4.5     ~ 308 0
11 NGC 2360 OpC 07 17 45.8 -15 38 21           ~ 213 0
12 Cl Melotte 71 OpC 07 37 31.3 -12 03 42   7.44 7.1     ~ 149 0
13 NGC 2818 OpC 09 16 10.8 -36 37 09           ~ 108 1
14 NGC 3114 OpC 10 01 55.0 -60 02 16   4.47 4.2     ~ 213 0
15 NGC 3532 OpC 11 05 33.9 -58 42 13           ~ 414 0
16 IC 2714 OpC 11 17 30.9 -62 43 09     8.2     ~ 110 0
17 NGC 3960 OpC 11 50 36.4 -55 40 40   9.07 8.3     ~ 152 0
18 NGC 5822 OpC 15 04 08.3 -54 21 52           ~ 238 0
19 UCAC4 204-120584 * 16 27 40.1406683592 -49 13 24.014355312   14.138 13.453 13.485   ~ 6 0
20 NGC 6134 OpC 16 27 48.5 -49 09 40   7.89 7.2     ~ 166 0
21 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0
22 NGC 6705 OpC 18 51 03.7 -06 16 18   6.32 5.8     ~ 442 0

To bookmark this query, right click on this link: simbad:objects in 2021MNRAS.502.4350S and select 'bookmark this link' or equivalent in the popup menu