发表机构
Instituto de Astrofísica de Canarias; Departamento de Astrofísica, Universidad de La Laguna; Institute of Astronomy, KU Leuven; Leuven Gravity Institute, KU Leuven（加那利天体物理研究所; 拉古纳大学天体物理学系; 鲁汶大学天体物理研究所; 鲁汶大学引力研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文扩展SPAMMS恒星表面建模工具的模型大气网格，覆盖更广的温度、重力和金属丰度范围，并验证其在快速旋转恒星和食双星上的应用。
AI 中文摘要
背景。准确的恒星光谱对于推导恒星性质至关重要。传统模型大气常常过度简化破坏球对称性的现象，如旋转形变或多重性。大质量恒星的光谱斑块模型（SPAMMS）考虑了这些效应，但其适用性受限于其模型大气网格所覆盖的光谱类型。目标。我们旨在扩展SPAMMS可用的模型大气网格的参数空间，从而能够在更广泛的恒星类型范围内进行光谱合成。方法。我们使用PRISMAS（网格化大气表面的辐射强度合成管线）计算了101个出射角的特定强度$I\left(\lambda,\mu\right)$，并预先计算了来自两个ATLAS9-Kurucz网格和基于TLUSTY的OSTAR2002和BSTAR2006模型的LTE和非LTE大气。结果。强度网格覆盖有效温度从3500到55000 K，表面重力从0.0到5.0 dex，涵盖O型到K型恒星。它们包括从0到30 Z_⊙的金属丰度和1、3、5、10 km/s的微湍流速度。光谱范围从3000到9000 Å，Δλ=0.01 Å。作为概念验证，我们用SPAMMS模拟了一颗快速旋转的B型恒星和一颗食双星Algol型双星。结论。新的LTE-Kurucz和NLTE-TLUSTY网格大幅扩展了SPAMMS可访问的参数空间。该代码现在可以为更广泛的恒星类型和几何形状生成合成光谱，包括快速旋转和多重系统——为非球对称恒星表面建模提供了更全面的框架。
英文摘要
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.
CommentsAccepted for publication in A&A; 12 pages (+3 appendix pages), 7 figures (+3 appendix figures)
