Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

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Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban LESIA/UFE Observatoire de Paris

description

Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban LESIA/UFE Observatoire de Paris. 2. http://www.bramboroson.com/astro/images/hrdiagram.jpg. Red giant solar-like oscillations Amplitude > 10 ppm or m/s Period > hours Few modes (10’s) - PowerPoint PPT Presentation

Transcript of Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

Page 1: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

Solar-like oscillations in Red

Giants:Status & Perspectives

with SIAMOIS

Caroline BarbanLESIA/UFE

Observatoire de Paris

Page 2: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

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http://www.bramboroson.com/astro/images/hrdiagram.jpg

Red giant solar-like oscillations

Amplitude > 10 ppm or m/sPeriod > hours

Few modes (10’s)Only radial modes (?)

Page 3: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

Solar-like oscillations detectionsRed giants

Page 4: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

http

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omep

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smc.

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balm

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Solar-like oscillations in red giants

UMa, K0III WIRE, 37 days 1.8 - 44 HzA~1-4 105 ppm

Hya, K3II-III

WIRE, 19 days4 - 7 Hz

A~1000 ppm

FEROS over 17 days 243 spectra50 - 120 Hz

<0>~8 HzArcturus, K1.5III

Buzasi et al. 2000Setiawan et al. 2005

Retter et al. 2003

0 5000frequency (Hz)

0 50

Page 5: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

http

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omep

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edu/

balm

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Hya (G7III,mv=3.54)

50 - 130 HzA~2 m/s

CORALIE, over 1 month433 Radial Velocity data

Autocorrelation

<0> ~ 7 Hz

3.07 M

3.15 M

2.93 M

Frandsen et al. 2002

Page 6: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

http

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omep

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smc.

edu/

balm

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Coralie/1.2mLa silla, Chile

Elodie/1.93m OHP, France

collaboration Belgique-Suisse-France

Solar-like oscillations

in Oph, Ser

Over 74 nights, 635 RV data

Page 7: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

Ser (K0III,mv=3.26)

80 - 170 HzA~2 m/s

<0> ~ 8 Hz

?-W1

2?W1

Barban et al., SOGO 2004

Over 74 nights, 1062 RV data

Autocorrelation

Page 8: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

http

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edu/

balm

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f Oph (G9.5III,mv=3.24)

Autocorrelation

W1

2W1-2 W1-

W1 -2-W1 3-W1

OR

Over 74 nights, 635 RV data

30 - 90 HzA~3 m/s

<0> ~ 5 or 7 Hz

<0> ~ 5 Hz

<0> ~ 7 Hz

De Ridder et al. 2006

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Red giant observations

with MOST

Page 10: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

Oph (G9.5III,mv=3.24)window

Poribte- Poribte

S-S -S+Poribte S+Poribt

-Poribte Poribte

duty cycle ~ 50%28 days

Page 11: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

Autocorrelation

<0> ~ 5 Hz

Oph (G9.5III,mv=3.24)

Page 12: Solar-like oscillations in Red Giants: Status & Perspectives with SIAMOIS Caroline Barban

Red giant observations with SIAMOISfrom DOME C

http://www.ifremer.fr/ifrtp/img/cartes/antarc.jpg

http://www.gdargaud.net/Photo/Panorama.html

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Possible targets with Siamois

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Siamois: red giant simulationwindow

window

Dome C, 90 daysduty cycle ~ 86 %

1 “ideal” site, 90 days8h/nightduty cycle ~ 33 %

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Dome C, 90 daysduty cycle ~ 86 %

1 “ideal” site, 90 days8h/nightduty cycle ~ 33 %

Siamois: red giant simulation

Autocorrelation W1

Autocorrelation

<0> 2<0>

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Why observing red giants

Hydrodynamical simulation (B. Freytag)

Samadi et al. 2005

Vm

ax/V

max

(L/M)1.5

(L/M)1.0

(L/M)0.8

(L/M)0.7