Period - Mass-loss Rate Relation of Miras with and without Tc
- Author(s)
- Stefan Uttenthaler
- Abstract
We present the discovery that Mira variables fall into two distinct sequences in a plot of near- to mid-IR color versus pulsation period diagram, if a distinction is made with respect to the presence of technetium (Tc) in the stars. Tc is an indicator of recent or ongoing deep mixing during a third dredge-up event. At a given period, the Tc-poor Miras are redder in K-[22] (i.e. have a higher dust mass-loss rate) than the Tc-rich Miras. This is counter-intuitive since the Tc-rich Miras are expected to be more evolved and should have a higher mass-loss rate. In this contribution we give an update on this recently discovered conundrum.
- Organisation(s)
- Department of Astrophysics
- Pages
- 49 - 56
- Publication date
- 08-2015
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/period--massloss-rate-relation-of-miras-with-and-without-tc(23537a8c-a93c-4d98-ab9b-39a71b05beae).html