SPAMMS: 3D spectroscopic modeling of stellar surfaces. II. Implementation of Kurucz and TLUSTY model atmospheres
Year: 2026
Type: preprint
Abstract: Context. Accurate stellar spectra are essential to derive stellar properties. Traditional model atmospheres often oversimplify phenomena that break spherical symmetry, such as rotational deformation or multiplicity. The Spectroscopic PAtch Model for Massive Stars (SPAMMS) accounts for these effects, but its applicability has been limited by the spectral types covered by its model atmosphere grids. Aims. We aim to extend the parameter space of the model atmosphere grids available to SPAMMS, enabling spectral synthesis across a broader range of stellar types. Methods. We computed specific intensities, $I\left(λ,μ\right)$, for $101$ emergent angles using PRISMAS (Pipeline of Radiative Intensity Synthesis for Meshed Atmospheric Surfaces), and pre-computed LTE and non-LTE atmospheres from two ATLAS9-Kurucz grids and the TLUSTY-based OSTAR2002 and BSTAR2006 models. Results. The intensity grids cover effective temperatures from $3500$ to $55000\,\mathrm{K}$ and surface gravities from $0.0$ to $5.0\,\mathrm{dex}$, spanning O- to K-type stars. They include metallicities from $0$ to $30\,\mathrm{Z_\odot}$ and microturbulent velocities of $1$, $3$, $5$, and $10\,\mathrm{km\,s^{-1}}$. The spectral range extends from $3000$ to $9000\,\mathring{\mathrm{A}}$ with $Δλ=0.01\,\mathring{\mathrm{A}}$. As a proof of concept, we modelled with SPAMMS a rapidly rotating B-type star and an eclipsing Algol-type binary. Conclusions. The new LTE-Kurucz and NLTE-TLUSTY grids substantially expand the parameter space accessible to SPAMMS. The code can now generate synthetic spectra for a broader range of stellar types and geometries, including rapidly rotating and multiple systems -- providing a more comprehensive framework for modelling non-spherical stellar surfaces.
Source: arXiv (Cornell University)
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Ministerio de Ciencia, Innovación y Universidades, Universidad de La Laguna, Fonds Wetenschappelijk Onderzoek, Ministerio de Economía y Competitividad, KU Leuven, Agencia Canaria de Investigación, Innovación y Sociedad de la Información, Vlaamse regering, European Regional Development Fund, Agencia Estatal de Investigación
Awards: G1105844351, G1175115578, G1440137623, G2056074053, G2262748287, G2346524269, Scientific exploitation of the KU Leuven Mercator telescope: addressing major shortcomings in our understanding of stellar structure and evolution of single and binary stars, G2738245931, G294895050, G3002814323, G300979063, G3180925806, G3261901391, G3480869486, G4085497550, G410571670, G425668148, G4299867415, G451917667, SOUL: Stellar evOlution in fUll gLory: rotation, magnetism, oscillations, outflows, tides, and binarity, G491712853, G5080475149, G5099673792, G5178665745, G523076202, G5300652233, G5435362997, G5487408010, G5539308778, G5635532810, G5913267992, G593054264, G5955501538, G5967599077, G6033112984, Unlocking the Dark Universe with Gravitational Wave Observations: from Quantum Optics to Quantum Gravity., G6731524417, G6744423155, G6745731214, G7084143925, G717256432, G7395345766, G7434936867, G7444208550, G7805626310, G7849210366, G7863371703, G8401454605, G8402056004, G8430294048, G8497050386, G8667377315, G869884560, G8719330135
OpenAlex ID: W7213319152