Blue stragglers after the main sequence

Alison Sills*, Amanda Karakas, John Lattanzio

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    69 Citations (Scopus)


    We study the post-main-sequence evolution of products of collisions between main-sequence stars (blue stragglers), with particular interest paid to the horizontal branch and asymptotic giant branch phases. We found that the blue straggler progeny populate the color-magnitude diagram slightly blueward of the red giant branch and between 0.2 and 1 magnitudes brighter than the horizontal branch. We also found that the lifetimes of collision products on the horizontal branch is consistent with the numbers of so-called "evolved blue straggler stars" (E-BSS) identified by various authors in a number of globular clusters, and is almost independent of mass or initial composition profile. The observed ratio of the number of E-BSS to blue stragglers points to a main-sequence lifetime for blue stragglers of approximately 1-2 Gyr on average.

    Original languageEnglish
    Pages (from-to)1411-1420
    Number of pages10
    JournalAstrophysical Journal
    Issue number2
    Publication statusPublished - 20 Feb 2009


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