论文标题
在热脉冲渐近巨型分支上，对附近磁盘星系的光的贡献
On the Thermally Pulsing Asymptotic Giant Branch Contribution to the Light of Nearby Disk Galaxies
论文作者
论文摘要
从热脉动渐近巨型分支（TP-AGB）恒星到星系恒星种群的光度贡献的研究对于确定其物理参数（例如，恒星质量和年龄）至关重要。我们使用附近84个磁盘星系的样本来探索具有TP-AGB恒星不同光度贡献的不同恒星种群合成模型。我们将模型以像素 - 甲状化为基础，将模型与光学和近红外（NIR）光度法拟合。拟合的统计数据表明，TP-AGB恒星的低亮度贡献（即NIR中的高质量与光比）的偏爱。然而，在我们的样本中，在TP-AGB恒星中，在我们样本中的30％至40％的像素中，高肌度的贡献（因此，NIR中的质量低比）受到青睐。根据我们的发现，附近磁盘星系中的平均TP-AGB恒星光度贡献可能会随着哈勃类型而变化。这可能是由于金属贫困恒星比金属丰富的恒星更早地损失质量，这可能是TP-AGB质量损失速率变化的结果，这是由于预尘埃的风在粉尘驱动的风之前。
The study of the luminosity contribution from thermally pulsing asymptotic giant branch (TP-AGB) stars to the stellar populations of galaxies is crucial to determine their physical parameters (e.g., stellar mass and age). We use a sample of 84 nearby disk galaxies to explore diverse stellar population synthesis models with different luminosity contributions from TP-AGB stars. We fit the models to optical and near-infrared (NIR) photometry, on a pixel-bypixel basis. The statistics of the fits show a preference for a low-luminosity contribution (i.e., high mass-to-light ratio in the NIR) from TP-AGB stars. Nevertheless, for 30 percent to 40 percent of the pixels in our sample a high-luminosity contribution (hence low mass-to-light ratio in the NIR) from TP-AGB stars is favored. According to our findings, the mean TP-AGB star luminosity contribution in nearby disk galaxies may vary with Hubble type. This may be a consequence of the variation of the TP-AGB mass-loss rate with metallicity, if metal-poor stars begin losing mass earlier than metal-rich stars, because of a pre-dust wind that precedes the dust-driven wind.
