Oscillations and Spins of Stars and Life

Alexander KosovichevStanford University

My first meeting with Wojtek: European Study Conference Oscillations as a Probe of the Sun's Interior":

Catania, 20-24 June 1983

Wojtek

First meeting: Oscillations as a Probe of the Sun's Interior":

Catania, 20-24 June 1983

Visit of Centrum Astronomiczne im. Mikołaja Kopernika (CAMK) in Warsaw for 3 months in

1986

CAMK was established in 1973 on occasion of 500th anniversary of Nicolaus Copernicus, and

opened in 1978

Picture of youngest Wojtek (1973), I found on Internet

Computer equipment: PDP 11/45IBM PC XTs brought to CAMK by Phil Goode

Warsaw in 1986

Living with shock therapy

CAMK was the best place to live and work

Low Frequency Oscillations in Slowly Rotating Stars

• Dziembowski, W. and A. Kosovichev (1987). "Low Frequency Oscillations in Slowly Rotating Stars - Part One - General Properties." Acta Astronomica 37: 313.

• Dziembowski, W., A. Kosovichev, and M. Kozlowski (1987). "Low

Frequency Oscillations in Slowly Rotating Stars - Part Two - Inertial Modes in the Solar Convective Envelope." Acta Astronomica 37: 331.

• Dziembowski, W. and A. Kosovichev (1987). "Low Frequency Oscillations in Slowly Rotating Stars - Part Three - Kelvin-Helmholtz Instability." Acta Astronomica 37: 341.

Low Frequency Oscillations in Slowly Rotating Stars

• Dziembowski, W., A. Kosovichev, and M. Kozlowski (1987). Inertial Modes Trapped in the Solar Convective Envelope, Advances in Helio- and Asteroseismology, Proceedings of the Symposium held 17-11 July 1986, in Aarhus, Denmark. Edited by J. Christensen-Dalsgaard and S. Frandsen. IAU Symposium, No. 123. Dordrecht: D. Reidel Publishing Co., p.117, 1988

Low Frequency Oscillations in Slowly Rotating Stars: Proc. IAU Sym. 123 -

shortest paper I ever published

Primary question: What happens to g-modes when their frequencies become comparable with stellar rotation rate?

?W/2p

N2/W2 in Standard Solar Model S

W2 > N2

radial wavenumber

g-modes

inertialmodes

radial wavenumber

g-modes

inertialmodes

r-mode

rotational splitting

l(l+1)/2m

Calculations of the frequency spectra andmode eigenfunctions showed that the oscillation amplitude is concentrated athigh latitudes.

• Dziembowski, W. and A. Kosovichev (1987). "Low Frequency Oscillations in Slowly Rotating Stars - Part Three - Kelvin-Helmholtz Instability." Acta Astronomica 37: 341.

ADS read/citation statistics

LMXB: low-mass X-ray binaries

Low Frequency Oscillations in Slowly Rotating Stars

• Dziembowski, W. and A. Kosovichev (1987). "Low Frequency Oscillations in Slowly Rotating Stars - Part One - General Properties." Acta Astronomica 37: 313.

• Dziembowski, W., A. Kosovichev, and M. Kozlowski (1987). "Low

Frequency Oscillations in Slowly Rotating Stars - Part Two - Inertial Modes in the Solar Convective Envelope." Acta Astronomica 37: 331.

• Dziembowski, W. and A. Kosovichev (1987). "Low Frequency Oscillations in Slowly Rotating Stars - Part Three - Kelvin-Helmholtz Instability." Acta Astronomica 37: 341.

Inside the Sun, Versailles 1989

Inside the Sun, Versailles 1989

Inside the Sun, Versailles 1989

Life twistsIoA, Cambridge, 1990-94

SOHO, Stanford, 1994-2010

Solar Dynamic Observatory, Stanford 2010 -

Big Bear Solar ObservatoryNew Solar Telescope

1.6m clear aperture – world largest solar telescope

Great Wojtek’s lessons

• Do not afraid solving difficult problems• Never try to solve problems that are too

difficult

Santa Fe 2009

Thanks, Wojtek!