Doradus stars in the SIAMOIS context Philippe Mathias Observatoire de la Côte d’Azur Dept. GEMINI
Jan 09, 2016
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
Fekel et al. 2005
Large variety of spectra
• OHP survey:
Mathias et al. 2004
g-modes: tangential motions
Kaye et al. 1999
LPV detection
v.sin i = 46 km/s
RV variations
• HD 209295
De Cat et al. 2006
Typical amplitudes
Composite spectra: ~ 10%
Fekel et al. 2003 HD 7169
50% in a binary system
Tidal excitations/ hybrids ?
Warner et al. 2003
Multi-site survey of HD 211699
OHP+KPNO
v.sini=12km/s
Fourier analysis
Hipparcos:f = 0.933 /d
2 others:
1.23 /d1.46 /d
Complementary observations:interferometry
• Ex: HD 147787
• P = 39 d
• e=0.59
• M1/M2 ~ 1
• min ~ 12.3 mas
well resolved by the VLTI
(u,v) plane coverage (ATs)
SIAMOIS targets
• Visibility > 3 months from DOME C
• Moderate v.sin i
(< 20 km/s)• V < 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!