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Extended main sequence turn-off originated from a broad range of stellar rotational velocities | | Beomdu Lim
; Gregor Rauw
; Yael Naze
; Hwankyung Sung
; Narae Hwang
; Byeong-Gon Park
; | | Date: |
5 Nov 2018 | | Abstract: | Star clusters have long been considered to comprise a simple stellar
population, but this paradigm is being challenged, since apart from multiple
populations in Galactic globular clusters^{1,2}, a number of intermediate-age
star clusters exhibit a significant colour spread at the main sequence turn-off
(MSTO)^{3,4,5,6,7,8,9,10,11}. A sequential evolution of multiple generations of
stars formed over 100-200 million years is a natural explanation of this colour
spread^{12}. Another approach to explain this feature is to introduce the
effect of stellar rotation^{13}. However, its effectiveness has not yet been
proven due to the lack of direct measurements of rotational velocities. Here we
report the distribution of projected rotational velocities (V sin i) of stars
in the Galactic open cluster M11, measured through a Fourier transform
analysis. Cluster members display a broad V sin i distribution, and fast
rotators including Be stars have redder colours than slow rotators. Monte Carlo
simulations infer that cluster members have highly aligned spin axes and a
broad distribution of equatorial velocities biased towards high velocities. Our
findings demonstrate how stellar rotation affects the colours of cluster
members, suggesting that the colour spread observed in populous clusters can be
understood in the context of stellar evolution even without introducing
multiple stellar populations. | | Source: | arXiv, 1811.1593 | | Services: | Forum | Review | PDF | Favorites | |
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