标题： Gaia/GSP-spec 的 gamma Doradus 脉动星的光谱特性 显示英文标题

标题： Gaia/GSP-spec spectroscopic properties of gamma Doradus pulsators

摘要： Gaia/DR3提供了大量新的g模式脉动星，其中约11,600颗是Gam Dor恒星。 本工作展示了通过分析数百万条Gaia光谱的GSP-spec模块估算的这些Gam Dor脉动星的光谱参数。 为了确定属于银河系薄盘的子样本，检查了这些新Gaia脉动星的银河位置、运动学和轨道特性，这些年轻的恒星应主要存在于该薄盘中。 恒星的光度、半径和天体测量表面重力未采用任何来自不确定恒星演化模型的先验条件。 这些参数与GSP-spec的有效温度、光谱重力和金属丰度相结合，然后通过与近期文献研究的比较进行验证。 大多数恒星被发现属于银河系薄盘，这是预期的结果。 还发现所得到的光度、半径和天体测量表面重力质量很高，且具有真实Gam Dor脉动星的典型值。 此外，我们证明了具有足够高信噪比光谱或慢至中等旋转速率的脉动星的Teff和[M/H]是稳健的。 这使得可以定义一个真实的慢速旋转Gaia Gam Dor脉动星子样本。 它们的Teff在约6500到7800K之间，log(g)约为4.2，光度和恒星半径分别在约5Lsun和1.7Rsun处达到峰值。 [M/H]接近太阳值，尽管识别出了0.5dex更贫金属和更富金属的Gam Dor恒星。 [alpha/Fe]含量与银河系盘的化学特性完全一致。 因此，Gaia/DR3的Gam Dor恒星光谱特性确认了这些脉动星的性质，并允许对这类恒星的新大样本进行化学物理参数化。 此外，未来的Gaia DR将显著增加具有良好精度光谱参数的Gam Dor恒星数量。 显示英文摘要

摘要： Gaia/DR3 has provided a large sample of new g-mode pulsators, among which~11,600 are Gam Dor stars. This work present the spectroscopic parameters of these Gam Dor pulsators estimated by the GSP-spec module that analysed millions of Gaia spectra. The Galactic positions, kinematics, and orbital properties of these new Gaia pulsators were examined in order to define a sub-sample belonging to the Milky Way thin disc, in which these young stars should preferentially be found. The stellar luminosities, radii, and astrometric surface gravities were estimated without adopting any priors from uncertain stellar evolution models. These parameters, combined with the GSP-spec effective temperatures, spectroscopic gravities, and metallicities were then validated by comparison with recent literature studies. Most stars are found to belong to the Galactic thin disc, as expected. It is also found that the derived luminosities, radii, and astrometric surface gravities are of high quality and have values typical of genuine Gam Dor pulsators. Moreover, we have shown that Teff and [M/H] of pulsators with high enough SNR spectra or slow to moderate rotation rates are robust. This allowed to define a sub-sample of genuine slow-rotating Gaia Gam Dor pulsators. Their Teff are found between ~6500 and ~7800K, log(g) around 4.2 and luminosities and stellar radii peak at ~5Lsun and ~1.7Rsun. [M/H] is close to the Solar value, although 0.5dex more metal-poor and metal-rich Gam Dor are identified. The [alpha/Fe] content is fully consistent with the chemical properties of the Galactic disc. Gaia/DR3 spectroscopic properties of Gam Dor stars therefore confirm the nature of these pulsators and allow to chemo-physically parametrise a new large sample of such stars. Moreover, future Gaia DR should drastically increase the number of Gam Dor stars with good-precision spectroscopically derived parameters.