论文标题
估计Spiou Specra的44 M矮人的大气特性
Estimating the atmospheric properties of 44 M dwarfs from SPIRou spectra
论文作者
论文摘要
我们描述了一种旨在得出M矮人准确参数的方法的进步。 Our analysis consists in comparing high-resolution infrared spectra acquired with the near-infrared spectro-polarimeter SPIRou to synthetic spectra computed from MARCS model atmospheres, in order to derive the effective temperature ($T_{\rm eff}$), surface gravity ($\rm \log{g}$), metallicity ([M/H]) and alpha-enhancement （$ \ rm [α/fe] $）在Spiou Legacy调查（SLS）中监测的44 m矮人。依靠这些恒星中的12个，我们通过完善模型良好的恒星线的选择来校准我们的方法，并调整线列表参数，以在必要时改善拟合度。我们检索到的$ t _ {\ rm eff} $，$ \ rm \ log {g} $和[m/h]与文献值非常吻合，分散订单为50 k in $ t _ {\ rm eff} $ in $ t _ {\ rm eff} $，in 0.1 dex in $ \ rm \ rm \ rm \ log \ log {g} $和[m/h]和[m/h]。我们报告，拟合$ \ rm [α/fe] $对其他恒星参数的推导产生了影响，这激发了我们将拟合程序扩展到此附加参数。我们发现，我们检索到的$ \ rm [α/fe] $与其他研究中获得的经验关系的期望兼容。
We describe advances on a method designed to derive accurate parameters of M dwarfs. Our analysis consists in comparing high-resolution infrared spectra acquired with the near-infrared spectro-polarimeter SPIRou to synthetic spectra computed from MARCS model atmospheres, in order to derive the effective temperature ($T_{\rm eff}$), surface gravity ($\rm \log{g}$), metallicity ([M/H]) and alpha-enhancement ($\rm [α/Fe]$) of 44 M dwarfs monitored within the SPIRou Legacy Survey (SLS). Relying on 12 of these stars, we calibrated our method by refining our selection of well modelled stellar lines, and adjusted the line list parameters to improve the fit when necessary. Our retrieved $T_{\rm eff}$, $\rm \log{g}$ and [M/H] are in good agreement with literature values, with dispersions of the order of 50 K in $T_{\rm eff}$ and 0.1 dex in $\rm \log{g}$ and [M/H]. We report that fitting $\rm [α/Fe]$ has an impact on the derivation of the other stellar parameters, motivating us to extend our fitting procedure to this additional parameter. We find that our retrieved $\rm [α/Fe]$ are compatible with those expected from empirical relations derived in other studies.
