Beer, Bureaucracy and Binary Stars
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1 Beer, Bureaucracy and Binary Stars Robert Izzard AIfA, Bonn
2 Orbital Dynamics BINARY STARS Convection Mixing Fluid Transfer Tides Winds Robert Izzard, Argelander Institute for Astronomy, University of Bonn
3 A (typical?) Stellar System Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 3 / 17
4 A Binary Stellar System Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 4 / 17
5 Night Sky Declination (Latitude) Yale Bright Star Catalogue, Stars Brighter than 5th Mag Right Ascension (Longitude) Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 5 / 17
6 Night Sky Binaries: 5%! Declination (Latitude) Yale Bright Star Catalogue, Stars Brighter than 5th Mag Right Ascension (Longitude) Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 6 / 17
7 Old stars are big: interaction Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 7 / 17
8 Old stars make heavy metal(s) M, Z = Z /5 Radius / R Time / Myr Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 8 / 17
9 Old stars make heavy metal(s) M, Z = Z /5 Radius / R Carbon Time / Myr Time / Myr Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 9 / 17
10 Old stars make heavy metal(s) M, Z = Z /5 Radius / R 6e e e e-7 1 Carbon Barium.5 2e e-7 Time / Myr Time / Myr Time / Myr Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 1 / 17
11 Old stars make heavy metal(s) M, Z = Z /5 Radius / R 6e e e e Carbon Barium Carbon.5 2e e-7 Time / Myr Time / Myr Time / Myr Radius / R Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 11 / 17
12 Big Science Problems Results of binary interaction models do not agree well with models! 1.8 Eccentricity log 1 (Period/days) This model is very approximate... can do better. Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 12 / 17
13 STAREVOL Stellar Evolution code Why Universite Libre de Bruxelles? Perfect code for late evolutionary phases Brussels binary observers group What is STAREVOL? Star = 1D, many shells Henyey/N-R solver Detailed single-star physics Truthfully, Why Brussels? Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 13 / 17
14 BINSTAR Based on STAREVOL Two stars Binary interactions Orbit Tides Mass/angular momentum transfer Simple OpenMP Graphical frontend Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 14 / 17
15 Where does the computational effort go? 13,,, years of binary star evolution: 1M + 1M wide binary, main sequence only Calculation Time Opacity 14% Nuclear rates 22% Nucleosynthesis 9% Eq. of State 22% Tides 6% Henyey <1%! Most of the time goes into computing (micro)physics shell by shell. Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 15 / 17
16 Shell-by-shell computation Most operations are shell by shell, could be massively parallel! Calculation Method Opacity Table lookup Nuclear rates Table lookup Nucleosynthesis Matrix calculations (*,+) Eq. of State Table and calculations Tides calculations Henyey Matrix calculations, serial Worth the GPU effort? Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 16 / 17
17 Future Prospects GPUs are an untapped resource which in stellar evolution studies Faster code: more stars Why? statistical studies stellar populations without previous approximations to compare with observations 1. statistically 2. quantitatively to constrain model parameters to understand the (astro)physics Tarantula Nebula, Large Magellanic Cloud Robert Izzard (AIfA, Bonn) Beer, Bureaucracy and Binary Stars 17 / 17
Robert Izzard Université Libre de Bruxelles
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