no code implementations • 8 Jan 2021 • N. D. Kee, J. O. Sundqvist, L. Decin, A. de Koter, H. Sana
We find that the pressure due to the characteristic turbulent velocities inferred for red supergiants is sufficient to explain the mass-loss rates of these objects in the absence of the normally employed opacity from circumstellar dust.
Solar and Stellar Astrophysics
no code implementations • 5 Jan 2021 • M. C. Ramírez-Tannus, F. Backs, A. de Koter, H. Sana, H. Beuther, A. Bik, W. Brandner, L. Kaper, H. Linz, Th. Henning, J. Poorta
Using literature data, we measured the radial-velocity dispersion ($\sigma_\mathrm{RV}$) as a proxy for the close binary fraction in ten OB associations in the Galaxy and the Large Magellanic Cloud, spanning an age range from 1 to 6 Myrs.
Solar and Stellar Astrophysics Astrophysics of Galaxies
no code implementations • 10 Dec 2020 • L. G. Poniatowski, J. O. Sundqvist, N. D. Kee, S. P. Owocki, P. Marchant, L. Decin, A. de Koter, L. Mahy, H. Sana
The resulting velocity structure is non-monotonic and can be separated into three phases: i) an initial acceleration to supersonic speeds ii) stagnation and even deceleration, and iii) an outer region of rapid re-acceleration.
Solar and Stellar Astrophysics