Download - Tools for the Analysis of Stars and Nebulae
Tools for the Analysis of Tools for the Analysis of Stars and NebulaeStars and Nebulae
Thomas RauchInstitut für Astronomie und AstrophysikUniversität TübingenGermany
23.03.2007 Spectroscopy & VO Workshop 2
Synthetic Spectra for Hot, Compact Stars Spectra for Hot, Compact Stars
• TMAP– Tübingen NLTE Model-Atmosphere Package
• http://astro.uni-tuebingen.de/~rauch/TMAP/TMAP.html
– hydrostatic and radiative equilibrium– plane-parallel / spherical geometry
– fully line-blanketed (H – Ni) model atmospheres
state of the art state of the art
23.03.2007 Spectroscopy & VO Workshop 4
Spectral Analysis via GAVOSpectral Analysis via GAVO
• based on TMAP, the Tübingen Model-Atmosphere Package, provide
– Synthetic Spectra• http://astro.uni-tuebingen.de/~rauch/TMAF/TMAF.html• http://archive.eso.org/wdb/wdb/vo/model_rauch/form
– Simulation Software• http://astro.uni-tuebingen.de/~TMAW/index_gavo.shtml
– Atomic Data• http://astro.uni-tuebingen.de/~rauch/TMAD/TMAD.html
23.03.2007 Spectroscopy & VO Workshop 5
Spectral Analysis via GAVO IISpectral Analysis via GAVO II
• way to reality
– use model-flux grids• ready to use, interpolation
– calculate individual model atmospheres• Teff, log g, mass fraction {Xi}, i (H, He, C, N, O)
– standard model atoms
– create own atomic-data files, i (H - Ni), and calculate model atmospheres
23.03.2007 Spectroscopy & VO Workshop 6
Spectral Analysis via GAVOSpectral Analysis via GAVO
• Aim: provide
– Synthetic Spectra• TMAF
– Simulation Software• TMAW
– Atomic Data• TMAD
23.03.2007 Spectroscopy & VO Workshop 7
TMAW request: Teff, log g, {Xi}
check GAVO database:requested parameters matched
within tolerance limits?
yes: offer existing modelno: calculate new model and flux tables
and send into database
accept request exact parameters
TMAW TMAW
IAAT databaseTeff, log g, {Xi}
modelatomic data filefrequency grid
GAVO databaseTeff, log g, {Xi}
flux tables5 - 2000Å
3000 - 7000Å3000 - 55000Å
Johnson colors
23.03.2007 Spectroscopy & VO Workshop 8
TMAW IITMAW II
• create– atomic data file
• calculate – frequency grid– start model in grey approximation– NLTE model atmosphere– emergent flux
• selected wavelength interval and resolution
23.03.2007 Spectroscopy & VO Workshop 9
TMAW IIITMAW III
• products (via email)
– flux tables (, F, F,line / F,cont)• ASCII + VOTable• selected individual wavelength interval• selected: 5 – 2000Å, 3000 – 7000Å, 3000 - 55000Å
– plot of flux table– output from last iteration of TMAP
23.03.2007 Spectroscopy & VO Workshop 10
TMAW IIITMAW III• data base
– model atmosphere • atomic-data file + frequency grid
– flux tables (web access)• 5 – 2000Å, 3000 – 7000Å, 3000 - 55000Å
23.03.2007 Spectroscopy & VO Workshop 11
TMAW model descriptionTMAW model description
• Spectral Data Model– synthetic spectra
• comments– code– NLTE– homogeneous– hydrostatic– etc.
• parameters– Teff
– log g
– {Xi}
23.03.2007 Spectroscopy & VO Workshop 12
Future WorkFuture Work
• Web Interface for MOCASSIN– 3-D photoionization code
• Barbara Ercolano (Cambridge)
– ionizing fluxes from TMAW
• TMAP models for– neutron stars– accretion disks (cataclysmic variables)– …