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| Paper: |
Period – Mass-loss Rate Relation of Miras with and without Tc |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
49 |
| Authors: |
Uttenthaler, S. |
| 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. |
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