| Issue |
EAS Publications Series
Volume 71-72, 2015
The Physics of Evolved Stars: A Conference Dedicated to the Memory of Olivier Chesneau
|
|
|---|---|---|
| Page(s) | 279 - 280 | |
| Section | Circumstellar Environments | |
| DOI | https://doi.org/10.1051/eas/1571062 | |
| Published online | 01 December 2015 | |
E. Lagadec, F. Millour and T. Lanz (eds)
EAS Publications Series, 71–72 (2015) 279-280
Yellow Hypergiants: A Comparative Study of HR 5171A, Rho Cas, and HR 8752
1 Royal Observatory of Belgium, Brussels, Belgium
2 Royal Netherlands Institute for Sea Research, Den Burg, The Netherlands
3 Laboratory for Space Research, Utrecht, The Netherlands
4 Leiden Observatory, Leiden University, The Netherlands
5 University of Leeds, UK
e-mail: Alex.Lobel@oma.be, alobel@sdf.org
We present a comparative study of the detailed spectroscopic variability of selected Fe i absorption lines observed between 1991 and 1995 in the optical spectra of the bright yellow hypergiants HR 5171A and Rho Cas. We also compare with the high-resolution spectrum of HR 8752. The three cool hypergiants reveal broad lines with very similar shapes. The variations with time in the line shapes and depths of HR 5171A and Rho Cas are very similar. The spectroscopic variability is caused by quasi-periodic atmospheric pulsations that strongly correlates with the observed radial velocity and V-brightness changes.
© EAS, EDP Sciences, 2015