The A-Star Puzzle (IAU S224)

, by Edited by Juraj Zverko , Jozef Ziznovsky , Saul J. Adelman , Werner W. Weiss

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ISBN: 9780521850186 | 0521850185
Cover: Hardcover
Copyright: 4/25/2005

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Over the last few decades, nuclear processes, radiation transfer, opacities and many other important physical processes have been incorporated in the modelling of stars. As knowledge of these processes has advanced, it has become clear that other associated physical processes are not well understood. This volume investigates these processes, focusing on convection, diffusion, rotation, and magnetic fields. It is a valuable resource for researchers in the field of stellar astrophysics, and graduate students.

Preface

Organizing committee

xiii

Conference photograph

xiv

Conference participants

xvi

Dedication

xviii

Section A. Normal A-Stars

Werner W. Weiss

IR: The physical properties of normal A-stars

(12)

S.J. Adelman

IR: Standard model atmospheres and non-LTE effects

(10)

J. Kubat

D. Korcakova

CP: NLTE wind models of A supergiants

(6)

J. Krticka

J. Kubat

CP: Stellar model atmospheres with magnetic line blanketing

(6)

S. Khan

O. Kochukhov

D. Shulyak

CP: A spectral study of Vega: A rapidly-rotating pole-on star

(8)

G. Hill

A.F. Gulliver

S.J. Adelman

Panel discussion A

(4)

S.J. Adelman

Section B. Stellar Evolution, Rotation, Binarity

Nikolay Piskunov

IR: Stellar evolution

(12)

A. Noels

J. Montalban

C. Maceroni

IP: Mass loss, meridional circulation and turbulence in contemporary stellar evolution models

(10)

S. Talon

IP: Pre-Main-Sequence A-type stars

(12)

M. Marconi

F. Palla

Binarity as a tool for determining the physical properties and evolutionary aspects of A-stars

(8)

M. Yildiz

CP: Effective mass: A new concept in stellar astrophysics based on the internal rotation, and its place in the A- and B-star puzzle

(6)

M. Yildiz

CP: First signatures of strong differential rotation in A-type stars

(8)

A. Reiners

F. Royer

CP: Magnetorotational instability in Ap star envelopes

103

(6)

R. Arlt

CP: Rotational velocity distributions of A-type stars

109

(6)

F. Royer

J. Zorec

A.E. Gomez

Panel discussion B

115

(4)

A. Noels

J. Montalban

C. Maceroni

Section C. Convection in Stars

J.D. Landstreet

IR: Convection in stars

119

(12)

F. Kupka

IP: Observations of convection in A-type stars

131

(8)

B. Smalley

IP: Numerical simulations of convection in A-stars

139

(10)

B. Freytag

M. Steffen

CP: Simulations of core convection and resulting dynamo action in rotating A-type stars

149

(6)

M.K. Browning

A.S Brun

J. Toomre

CP: 3D-simulation of the outer convection-zone of an A-star

155

(6)

R. Trampedach

CP: Thermohaline convection and metallic fingers in polluted stars

161

(6)

S. Vauclair

Panel discussion C

167

(6)

F. Kupka

Section D. Diffusion as the Mechanism of Element Segregation

C.R. Cowley

IR: Atomic diffusion in stellar surfaces and interiors

173

(12)

G. Michaud

IP: Diffusion in magnetic fields

185

(8)

G. Alecian

IP: Modelling of stratified atmospheres of CP-stars

193

(8)

F. LeBlanc

D. Monin

CP: Multicomponent stellar winds and chemical peculiarity in A stars

201

(8)

J. Krticka

J. Kubat

CP: Abundances of A/F and Am/Fm stars in open clusters as constraints to self-consistent models including transport processes

209

(6)

R. Monier

O. Richard

CP: Surface abundances of Am stars as a constraint on rotational mixing

215

(6)

O. Richard

S. Talon

G. Michaud

Panel discussion D

221

(4)

G. Michaud

Section E. Magnetic Fields

S. Bagnulo

IR: Magnetic fields of A-type stars

225

(10)

G. Mathys

IP: Stellar magnetic fields: the view from the ground and from space

235

(10)

G.A. Wade

IP: Magnetic fields in A stars

245

(8)

D. Moss

CP: Vertical and horizontal abundance structures of the roAp star HD 24712

253

(6)

T. Luftinger

O. Kochukhov

T. Ryabchikova

I. Ilyin

W. W. Weiss

Panel discussion E

259

(6)

G. Mathys

Section F. Chemically Peculiar Stars

D. W. Kurtz

IR: The CP Stars, an overview: Then and now

265

(18)

C.R. Cowley

D.J. Bord

IP: Observations of magnetic CP stars

283

(8)

T. Ryabchikova

IP: Observations of nonmagnetic CP stars: crossing boundaries

291

(10)

G.M. Wahlgren

CP: A search for SB2 systems among selected Am binaries

301

(6)

I.Kh. Iliev

M. Fenovcik

J. Budaj

J. Ziznovsky

J. Zverko

I. Barzova

I. Stateva

CP: The variable light curves of some mCP stars

307

(8)

D.M. Pyper

S.J. Adelman

CP: NLTE ionization equilibrium of Nd II and Nd III in cool A and Ap stars

315

(8)

L.I. Mashonkina

T.A. Ryabchikova

A.N. Ryabtsev

Panel discussion F

323

(2)

C.R. Cowley

Section G. Pulsating Variables

H. Shibahashi

IR: Pulsations of A stars

325

(10)

L.A. Balona

IP: δ Scuti and γ Doradus stars

335

(8)

M. Breger

IP: Some recent discoveries in roAp stars

343

(10)

D.W. Kurtz

V.G. Elkin

G. Mathys

J. Riley

M.S. Cunha

H. Shibahashi

E. Kambe

CP: Pulsating pre-Main sequence stars in young open clusters

353

(6)

K. Zwintz

M. Marconi

T. Kallinger

W. W. Weiss

CP: Excitation of the oscillations in roAp stars: Magnetic fields, diffusion, and winds

359

(8)

M.S. Cunha

S. Theado

S. Vauclair

CP: New approaches to solve the old Blazhko puzzle in RR Lyrae stars

367

(6)

K. Kolenberg

Panel discussion G

373

(6)

L.A. Balona

Section H. Evolved A-Type Stars

S.J. Adelman

IR: Evolved A-type stars

379

(16)

M. Parthasarathy

IP: Horizontal branch A- and B-type stars in globular clusters

395

(8)

S. Mohler

IP: Blue metal-poor stars

403

(8)

G. W. Preston

C. Sneden

IP: A supergiants

411

(8)

N. Przybilla

F. Bresolin

K. Butler

A. Kaufer

R.P. Kudritzki

K.A. Venn

Panel discussion H

419

(4)

S.J. Adelman

M. Parthasarathy

Section I. The A-Star Laboratory

F. Kupka

IR: A stars as physics laboratories

423

(10)

J.D. Landstreet

IP: Diffusion and magnetic field effects on stellar surfaces

433

(10)

O. Kochukhov

IP: The λ Bootis stars

443

(8)

E. Paunzen

IP: A theorist's view of the A-star laboratory

451

(8)

H. Shibahashi

CP: Asteroseismology and helium gradients in A-type Stars

459

(6)

S. Vauclair

S. Theado

Panel discussion I

465

(8)

J.D. Landstreet

Section J. Observational Challenges of A-Type Stars

G.A. Wade

IR: Observational challenges of A-type stars

473

(12)

S. Bagnulo

IP: A-stars and the Virtual Observatory

485

(10)

P. Padovani

Panel discussion J

495

(4)

S. Bagnulo

Summary of the Symposium

499

(6)

M.M. Dworetsky

List of Posters

505

(6)

Author index

511

(4)

Object index

515

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The A-Star Puzzle (IAU S224)

Summary

Table of Contents

Supplemental Materials