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)– …