Kinematic evidence for feedback-driven star formation in NGC 1893

Beomdu Lim, Hwankyung Sung, Michael S. Bessell, Sangwoo Lee, Jae Joon Lee, Heeyoung Oh, Narae Hwang, Byeong Gon Park, Hyeonoh Hur, Kyeongsoo Hong, Sunkyung Park

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)


    OB associations are the prevailing star-forming sites in the Galaxy. Up to now, the process of howOBassociations were formed remained amystery.Apossible process is self-regulating star formation driven by feedback from massive stars. However, although a number of observational studies uncovered various signposts of feedback-driven star formation, the effectiveness of such feedback has been questioned. Stellar and gas kinematics is a promising tool to capture the relative motion of newborn stars and gas away from ionizing sources. We present highresolution spectroscopy of stars and gas in the young open cluster NGC 1893. Our findings show that newborn stars and the tadpole nebula Sim 130 are moving away from the central cluster containing two O-type stars, and that the time-scale of sequential star formation is about 1 Myr within a 9 pc distance. The newborn stars formed by feedback from massive stars account for at least 18 per cent of the total stellar population in the cluster, suggesting that this process can play an important role in the formation of OB associations. These results support the self-regulating star formation model.

    Original languageEnglish
    Pages (from-to)1993-2003
    Number of pages11
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number2
    Publication statusPublished - 21 Jun 2018


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