Poster Open Access

Poster CS20.5 - Weakened magnetic braking supported by asteroseismic rotation

Hall, Oliver James; Davies, G. R.; van Saders, J.; Nielsen, M. B.; Lund, M. N.; Chaplin, W. J.; Garcia, R. A.; Amard, L.; Breimann, A. A.; Khan, S.; See, V.; Tayar, J.

Studies using asteroseismic ages and rotation rates from star-spot rotation have indicated that standard age-rotation relations may break down roughly half-way through the main sequence lifetime, a phenomenon referred to as weakened magnetic braking. While rotation rates from spots can be difficult to determine for older, less active stars, rotational splitting of asteroseismic oscillation frequencies can provide rotation rates for both active and quiescent stars, and so can confirm whether this effect really takes place on the main sequence. In this talk, I’ll show how we obtained asteroseismic rotation rates of 91 main sequence stars showing high signal-to-noise modes of oscillation. Using these new rotation rates, along with effective temperatures, metallicities and seismic masses and ages, we built a hierarchical Bayesian mixture model that showed that our new ensemble more closely agreed with weakened magnetic braking, over a standard rotational evolution scenario.

Files (723.2 kB)
Name Size
HallO_poster.pdf
md5:22402934dbf12939cf221615890ac085
723.2 kB Download
  • Davies et al. (2016)

  • Lund et al. (2017)

  • Silva Aguirre et al. (2015)

  • Silva Aguirre et al. (2017)

  • van Saders et al. (2016)

  • Barnes (2010)

59
70
views
downloads
All versions This version
Views 5959
Downloads 7070
Data volume 50.6 MB50.6 MB
Unique views 5656
Unique downloads 6565

Share

Cite as