Release 11.12 ("Hergest Ridge")

Gclusters :: Bibliographic item "gc509"

Article ID: gc509
AuthorFerraro, F. R. et al.
TitleWeighing Stars: The Identification of an Evolved Blue Straggler Star in the Globular Cluster 47 Tucanae
JournalThe Astrophysical Journal, Volume 816, Issue 2, article id. 70, 8 pp.
Year of publication2016 (on gclusters from 2016-01-20 10:52:27 )
AbstractGlobular clusters are known to host peculiar objects named blue straggler stars (BSSs), significantly heavier than the normal stellar population. While these stars can be easily identified during their core hydrogen-burning phase, they are photometrically indistinguishable from their low-mass sisters in advanced stages of the subsequent evolution. A clear-cut identification of these objects would require the direct measurement of the stellar mass. We used the detailed comparison between chemical abundances derived from neutral and from ionized spectral lines as a powerful stellar “weighing device” to measure stellar mass and to identify an evolved BSS in 47 Tucanae. (...) The large applicability of the proposed method to most of the globular clusters in our Galaxy opens the possibility to initiate systematic searches for evolved BSSs, thus giving access to still unexplored phases of their evolution.
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TagsNGC 104

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