1. E. Alécian, C. Catala, M.J. Goupil
RS Cha A binary system suitable for testing stellar physics modeling during the pre-main sequence phase.
E. Alécian, C. Catala, M.J. Goupil
LESIA - Observatoire de Paris-Meudon
2nd Corot-Brazil Workshop, Ubatuba
5 Nov. 2005

2. RS Cha : an PMS eclipsing SB2 system
Evelyne Alécian
RS Cha : an PMS eclipsing SB2 system
Primary
Secondary
References
M/M
1.89  0.01
1.87 0.01
Alécian et al. (2005)
R/R
2.15  0.06
2.36  0.06
Teff (K)
7638  76
7228  72
Ribas et al. (2000)
log(L/L)
1.15  0.09
1.13  0.09
[Fe/H]
0.17  0.01
P (day)
1.67
synchronized system
i (°)
83.4  0.3
Clausen &
Nordström (1980)

3. RS Cha : PMS Spectroscopic Binary
Evelyne Alécian
RS Cha : PMS Spectroscopic Binary
CESAM

4. RS Cha : PMS Spectroscopic Binary
Evelyne Alécian
RS Cha : PMS Spectroscopic Binary
CESAM

5. RS Cha : PMS Spectroscopic Binary
Evelyne Alécian
RS Cha : PMS Spectroscopic Binary
Error boxes calculated from masses and radii
CESAM

6.  Scuti type pulsations in RS Cha
Evelyne Alécian
 Scuti type pulsations in RS Cha
Log(Teff) (K)
Log(L/L)
Palla & Stahler (2001)
Andersen (1975) :
primary  PMS  Scuti star
Marconi & Palla (1998) :
theoretical instability strip
Palla & Stahler (2001) :
secondary  PMS  Scuti star
Alécian et al. (2005) :
both are pulsating
June Stellar Pulsation and Evolution

7.  Scuti type pulsations in both components
Evelyne Alécian
 Scuti type pulsations in both components
Residuals = vobs - vcalc
vcalc : velocity calculated from Clausen & Nordström (1980) ephemeris
Primary
Secondary
Alécian et al. (2005)

8.  Scuti type pulsations in both components
Alécian et al. (2005)
Evelyne Alécian
 Scuti type pulsations in both components
Residuals
Periodic variations
Primary
Secondary
Alécian et al. (2005)
Pulsation period ~ 1 h
June Stellar Pulsation and Evolution

9. Theoretical modes pulsations
Evelyne Alécian
Theoretical modes pulsations
Primary star, M = 1.89 M
degree l
Non-adiabatic calculations
MAD (M.-A. Dupret)

10. Theoretical modes pulsations
Evelyne Alécian
Theoretical modes pulsations
Secondary star, M = 1.87 M
degree l
Non-adiabatic calculations
MAD (M. A. Dupret)

11. Perspectives Improving temperature determination : next step
Evelyne Alécian
Perspectives
Improving temperature determination : next step
Improving knowledge of pulsations : long term continuous
multi-site monitoring of spectroscopic data

12. Evelyne Alécian
Autres diapo

13. RS Cha : PMS Spectroscopic Binary
Evelyne Alécian
RS Cha : PMS Spectroscopic Binary
June Stellar Pulsation and Evolution

14. RS Cha : PMS Spectroscopic Binary
Evelyne Alécian
RS Cha : PMS Spectroscopic Binary
June Stellar Pulsation and Evolution

15. RS Cha : Observations Primary Secondary References M/M 1.89  0.01
Evelyne Alécian
RS Cha : Observations
Primary
Secondary
References
M/M
1.89  0.01
1.87 0.01
Alécian et al. (2005)
R/R
2.15  0.06
2.36  0.06
logTeff (K)
3.883  0.010
3.859  0.010
Ribas et al. (2000)
log(L/L)
1.15  0.09
1.13  0.09
[Fe/H]
0.17  0.01
vsini (km/s)
64  6
70  6
i (°)
83.4  0.3
Clausen & Nordström (1980)
June Stellar Pulsation and Evolution