TY - GEN
T1 - Period - Mass-loss Rate Relation of Miras with and without Tc
AU - Uttenthaler, Stefan
PY - 2015/8
Y1 - 2015/8
N2 - 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.
AB - 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.
UR - http://adsabs.harvard.edu/abs/2015ASPC..497...49U
M3 - Contribution to proceedings
T3 - Astronomical Society of the Pacific Conference Series
SP - 49
EP - 56
BT - Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time
PB - Astronomical Society of the Pacific
T2 - Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time
Y2 - 28 July 2014 through 1 August 2014
ER -