Questions session 1: Tuesday, September 27, 2011
  • (Matteo): Asteroseismology probes of mixing in massive stars? Lots of work has been done on mixing and asteroseismology of low-mass (solar-type) stars, but there are compelling open questions for O and B stars - can seismology help? How?
    • Possible visiting 'experts' - Norbert Langer, Paul Groot, Danny Lennon, Melanie Godart, Georges Michaud
  • (Travis): Ages? Asteroseismology can be of use in determining ages of stars... but what are the uncertainties? How can we gauge the systematics? Cross-correlation with other techniques?
    • Possible visiting 'experst' - Dave Soderblom
  • (Rich): Rotation? This is a full 3-D (ish) problem with impact across the H-R diagram
    • Possible visiting 'experts' - Pascale Garaud, Suzanne Talon
  • (Masao): Mode identification and classification - a theoretical issue, since the Cowling approximation that allows for 'simple' classification really doesn't apply in the interesting cases.
  • (Steve): Asteroseismology as a probe of binary star evolution (in particular tidal circularization) - is it useful? Can we separate out the single-star behavior from the influence of a close companion?
    • Possible visiting 'experts' - Karsten Brogaard
  • Other potential visitors: Gilles Fontaine, Pierre-Olivier Quirion, Ann Marie Cody

Second question session: Monday, October 10, 2011

Surface effects on the eigenfrequencies - a better physical basis requires understanding the influence of convection. Mixing length theory just doesn't cut it - and we're using a theory / prescription from the year I (Steve) was born!

Third session: Monday, October 17, 2011

(Marc) Laundry list of seismic tools and their applications, calibrations and limitations.
(Jim) what can we learn about stellar interiors from tidal seismology.
(Rafael, Gunter, Dave, ...) Surface effects should also include activity and nonadiabatic effects... and a better way of treating convection.

Fourth session: Monday, October 31, 2011
Was devoted to long introduction round given the many new participants, followed by an interesting discussion with Peter Goldreich.

Fifth session: Monday, November 7, 2011
The few new participants introduced themselves (Melanie Godart and Bert Pablo). After that, the new interactions among participants and their topics were discussed. From this discussion, the following list of questions arose:

- are present sdB models appropriate to start applying inversions methods? Tests and comparisons are being done by Stephane and Valerie, Haili, JCD

- are the few red giant pulsators with outliers in Delta P real, or an artefact of the data analysis? Their Delta P is way too high... are we missing modes, misinterpretating the spacings,...? Or are they the very few expected red giants in ultrashort evolutionary phases?

- are the few stars with missing dipole modes, both in WG1 and WG8, due to stellar mergers? The number of such "outliers" is not in disagreement with the percentage expected to occur in close binaries...Who can produce stellar mergers and predict their oscillation signature? (Haili can...after we convince her that there are a few worries to ignore for a first set of tests if this phenomenon could explain the absence of dipole modes is a few main-sequence stars and several red giants) -> Rafa Garcia was inspired by this discussion to propose a discussion talk on Thur, Nov.17.

- what are the key questions to define the coupling of the red giant seismic studies and their evolution to those of sdB stars? How are these questions different for single versus binary stars?

Note: Liege Astrophysical Colloquium from 2 to 6 July 2012 will precisely address the evolution
RGB --> clump/HB/sdB --> AGB/WD or sdO

- can we distinguish RGB and AGB stars from their oscillations? The gravity-dominated modes should tell the difference given the different core mass and burning. Has anyone already detected solar-like oscillations in an AGB star? Are there such stars in the Kepler sample?




(from 10/10/11)
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