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g Doradus stars in the SIAMOIS context

g Doradus stars in the SIAMOIS context. Philippe Mathias Observatoire de la Côte d’Azur Dept. GEMINI. Generalities. A7 -- F5 V -- IV g-mode pulsators ~60 confirmed variables Periods: 0.3 -- 3 days Multiperiodic Flux-blocking mechanism 50% in binary system Solar metallicity.

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g Doradus stars in the SIAMOIS context

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  1. g Doradus stars in the SIAMOIS context Philippe Mathias Observatoire de la Côte d’Azur Dept. GEMINI

  2. Generalities • A7 -- F5 • V -- IV • g-mode pulsators • ~60 confirmed variables • Periods: 0.3 -- 3 days • Multiperiodic • Flux-blocking mechanism • 50% in binary system • Solar metallicity Fekel et al. 2005

  3. Large variety of spectra • OHP survey: Mathias et al. 2004

  4. g-modes: tangential motions Kaye et al. 1999

  5. LPV detection v.sin i = 46 km/s

  6. RV variations • HD 209295 De Cat et al. 2006

  7. Typical amplitudes

  8. Composite spectra: ~ 10% HD 7169 Fekel et al. 2003

  9. 50% in a binary system

  10. Tidal excitations/ hybrids ? Warner et al. 2003

  11. Multi-site survey of HD 211699 OHP+KPNO v.sini=12km/s

  12. Fourier analysis Hipparcos: f = 0.933 /d 2 others: 1.23 /d 1.46 /d

  13. Complementary observations:interferometry • Ex: HD 147787 • P = 39 d • e=0.59 • M1/M2 ~ 1 • rmin ~ 12.3 mas well resolved by the VLTI

  14. (u,v) plane coverage (ATs)

  15. SIAMOIS targets • Visibility > 3 months from DOME C • Moderate v.sin i (< 20 km/s) • V < 5 Fortuntately, non exhaustive list!

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