[논문]PROPERTIES OF OPEN CLUSTERS CONTAINING BLUE STRAGGLERS

Lee, Hyun-Uk; Chang, Heon-Young

doi:10.5303/jkas.2017.50.3.51

[국내논문] PROPERTIES OF OPEN CLUSTERS CONTAINING BLUE STRAGGLERS 원문보기

Journal of the Korean astronomical society = 천문학회지, v.50 no.3, 2017년, pp.51 - 59

Lee, Hyun-Uk (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) , Chang, Heon-Young (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)

Abstract ▼ AI-Helper

The presence of blue stragglers pose challenges to standard stellar evolution theory, in the sense that explaining their presence demands a complex interplay between stellar evolution and cluster dynamics. In the meantime, mass transfer in binary systems and stellar collisions are widely studied as a blue straggler formation channel. We explore properties of the Galactic open clusters where blue stragglers are found, in attempting to estimate the relative importance of these two favored processes, by comparing them with those resulting from open clusters in which blue stragglers are absent as of now. Unlike previous studies which require a sophisticated process in understanding the implication of the results, this approach is straightforward and has resulted in a supplementary supporting evidence for the current view on the blue straggler formation mechanism. Our main findings are as follows: (1) Open clusters in which blue stragglers are present have a broader distribution with respect to the Z-axis pointing towards the North Galactic Pole than those in which blue stragglers are absent. The probability that two distributions with respect to the Z-axis are drawn from the same distribution is 0.2%. (2) Average values of $log_10(t)$ of the clusters with blue stragglers and those without blue stragglers are $8.58{\pm}0.232$ and $7.52{\pm}0.285$, respectively. (3) The clusters with blue stragglers tend to be relatively redder than the others, and are distributed broader in colors. (4) The clusters with blue stragglers are likely brighter than those without blue stragglers. (5) Finally, blue stragglers seem to form in condensed clusters rather than simply dense clusters. Hence, we conclude that mass transfer in binaries seems to be a relatively important physical mechanism of the generation of blue stragglers in open clusters, provided they are sufficiently old.

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문제 정의

As pointed out above, the latter demands a sophisticated process, often including heavy numerical simulations. We are aware that it is beyond the purposes of this paper to evaluate in details the dynamical and evolutionary properties of the open clusters within the Galactic environment. However, what we have found here are, at least, consistent with previously reported correlations and consequently should be regarded as a supplementary supporting evidence for a current view on the blue straggler formation mechanism.
The authors thank the anonymous referees for critical comments and helpful suggestions which greatly improve the original version of the manuscript. This work was supported by BK21 Plus of the National Research Foundation of Korea and HYC was supported by a National Research Foundation of Korea Grant funded by the Korean government (NRF2015M1A3A3A02009155).

가설 설정

(4) The clusters with blue stragglers are likely brighter than those without blue stragglers. The average magnitudes J, H, K_S of the clusters hosting blue stragglers are −5.

제안 방법

Figure 1. Positions of the open clusters we analyzed in this study in the rectangular Galactic coordinates X and Y axes, and the number distribution of clusters obtained by projecting to X and Y axes. Open diamonds and gray dots denote clusters in which blue stragglers are present and those in which blue stragglers are absent, respectively.
To understand the environments where blue stragglers are formed, in this paper we have explored properties of the Galactic open clusters by dividing the parent sample of the Galactic open cluster catalog (Ahumada & Lapasset 2007) into two subsample based on whether blue stragglers are found in the clusters, and statistically compare these two subsamples.

성능/효과

(3) Averaged values of the colors J − H, H − KS, J −KS of the clusters hosting blue stragglers are 0.43± 0.170, 0.11 ± 0.074, 0.54 ± 0.235 whereas those of the clusters without blue stragglers are 0.19 ± 0.185, 0.09± 0.084, 0.23 ± 0.270, respectively.
(1) Open clusters in which blue stragglers are present have a broader distribution with respect to the Z-axis than those in which blue stragglers are absent, such that the proportion of the clusters with blue stragglers are growing as moving further from the midplane of the Galaxy. Moreover, the probability that two distributions with respect to the Z-axis are drawn from the same distribution is 0.
(2) Average values of log₁₀(t) of the clusters with blue stragglers and those without blue stragglers are 8.58 and 7.52, respectively.

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