g Doradus stars in the SIAMOIS context

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g Doradus stars in the SIAMOIS context

• Philippe Mathias
• Observatoire de la Côte dAzur
• Dept. GEMINI

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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
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Large variety of spectra

• OHP survey

Mathias et al. 2004
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g-modes tangential motions
Kaye et al. 1999
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LPV detection
v.sin i 46 km/s
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RV variations

• HD 209295

De Cat et al. 2006
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Typical amplitudes
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Composite spectra 10
HD 7169
Fekel et al. 2003
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50 in a binary system
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Tidal excitations/ hybrids ?
Warner et al. 2003
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Multi-site survey of HD 211699

• OHPKPNO
• v.sini12km/s

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Fourier analysis
Hipparcos f 0.933 /d 2 others 1.23 /d 1.46
/d
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Complementary observationsinterferometry

• Ex HD 147787
• P 39 d
• e0.59
• M1/M2 1
• rmin 12.3 mas
• well resolved by the VLTI

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(u,v) plane coverage (ATs)
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SIAMOIS targets

• Visibility gt 3 months from DOME C
• Moderate v.sin i
• (lt 20 km/s)
• V lt 5

27290 4.2 F4 III 55 bf
27377 7.4 F0 V 5.5 c / SB2
55892 4.5 F0 IV 51 bf
103257 6.7 F2 V c
110606 7.9 F2 V 5.8 c / SB2
137785 6.4 F2 V c
147787 5.3 F4 IV 7.6 c / SB2
149989 6.3 A9 V 134 bf
187028 7.5 F0 V 85 bf
197541 7.5 F0 V 29 c
206481 7.9 F0 V c
209295 7.3 F0 V 86 bf / SB / hy
216910 6.7 F2 IV 92 bf
224288 8.0 F0 V
Fortuntately, non exhaustive list!