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27503 results in Astrophysics

Page 133 of 1376

  • Stellar rotation bifurcation caused by tidal locking in the open cluster NGC 2287?

  • Weijia Sun, Chengyuan Li, Licai Deng, Richard de Grijs
  • Journal:
    Proceedings of the International Astronomical Union / Volume 14 / Issue S351 / May 2019
    Published online by Cambridge University Press:
    11 March 2020, pp. 228-232
    Print publication:
    May 2019
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  • We present a detailed analysis of the projected stellar rotational velocities of the well-separated double main sequence (MS) in the young, ∼200 Myr-old Milky Way open cluster NGC 2287 and suggest that stellar rotation may drive the split MSs in NGC 2287. We find that the observed distribution of projected stellar rotation velocities could result from a dichotomous distribution of stellar rotation rates. We discuss whether our observations may reflect the effects of tidal locking affecting a fraction of the cluster’s member stars in stellar binary systems. The slow rotators are likely stars that initially rotated rapidly but subsequently slowed down through tidal locking induced by low-mass-ratio binary systems. However, the cluster may have a much larger population of short-period binaries than is usually seen in the literature, with relatively low secondary masses.

  • Star clusters of the Andromeda galaxy. Multicolour HST photometry

  • Rokas Naujalis, Rima Stonkutė, Vladas Vansevičius
  • Journal:
    Proceedings of the International Astronomical Union / Volume 14 / Issue S351 / May 2019
    Published online by Cambridge University Press:
    11 March 2020, pp. 131-134
    Print publication:
    May 2019
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  • We performed a new integrated photometry in six passbands on HST M31 PHAT survey mosaics of 1181 star clusters spread over a large range of radial distance. Due to strongly varying background we interactively determined its level based on image and growth-curve analysis. We derived cluster age, mass, extinction, and metallicity by employing stochastic star cluster models.

  • Globular clusters and their link with stellar populations in the Milky Way

  • David Yong
  • Journal:
    Proceedings of the International Astronomical Union / Volume 14 / Issue S351 / May 2019
    Published online by Cambridge University Press:
    11 March 2020, pp. 19-23
    Print publication:
    May 2019
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  • Observations of stellar chemical compositions enable us to identify connections between globular clusters and stellar populations in the Milky Way. In particular, chemical abundance ratios provide detailed insight into the chemical enrichment histories of star clusters and the field populations. For some elements, there are striking differences between field and cluster stars which reflect different nucleosynthetic processes and/or chemical evolution. The goal of this talk was to provide an overview of similarities and differences in chemical compositions between globular clusters and the Milky Way as well as highlighting a few areas for further examination.

Page 133 of 1376