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Time-resolved high-resolution spectroscopy
of the pulsating
sdB star QQ Vir (PG1325+101)
John Telting et al., Shanghai, July 2009
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The case of QQ Vir
QQ Vir has a rich p-mode frequency spectrum (Silvotti et al. 2006)
Is a bright star (B=13.5), and has one dominant mode (P=137.8 sec)
Has a seismological model solution
based on frequency matching, which matches the dominant mode to
degree L=2 (Charpinet et al. 2006)
Telting & Østensen (2004) found from
low-resolution time-resolved spectroscopy that the dominant mode is
consistent with L=0
Observational campain to unravel the degree L of the main mode in QQ Vir in Feb/March 2008:
- Time-resolved high-resolution spectroscopy:
mode identification from line-profile variations
- Multi-site multi-colour photometric observations + radial velocities:
mode identification from amplitude ratios (Baran et al. later today)