Determining stellar accretion rates from Paα and Brβ emission lines with JWST NIRSpec,Astronomy & Astrophysics

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Determining stellar accretion rates from Paα and Brβ emission lines with JWST NIRSpec
Astronomy & Astrophysics ( IF 6.5 ) Pub Date : 2024-04-10 , DOI: 10.1051/0004-6361/202449282
Ciarán Rogers , Guido de Marchi , Bernhard Brandl

In this Letter, we present the first systematic spectroscopic measurements of the near-infrared (NIR) hydrogen recombination lines Paschen alpha (Pa_{α_{λ = 1.875 μm) and Brackett beta (Br_{β_{λ = 2.626 μm), produced by pre-main-sequence (PMS) stars. Such stars include T Tauri and Herbig AeBe stars, located in the massive Galactic star-forming region NGC 3603. We used measurements obtained from JWST NIRSpec, using multi-object spectroscopy (MOS) mode. Based on the existing empirical relations between L_{acc_{and L_{Br_{γ_{_{from the literature, we used our new measurements to formulate, for the first time, an empirical relationship between the accretion luminosity, L_{acc_{, of the stars and the line luminosities, L_{line_{, of both Pa_{α_{and Br_{β_{. These relationships are: and . These new relationships are key to establishing rough estimates of the accretion rates for large samples of PMS stars with JWST.}}}}}}}}}}}}}}}}}}

中文翻译：

使用 JWST NIRSpec 确定 Paα 和 Brβ 发射线的恒星吸积率

在这封信中，我们首次对近红外 (NIR) 氢复合谱线 Paschen α ( Pa _{α _{λ = 1.875 μm) 和 Brackett beta ( Br _{β _{λ = 2.626 μm) 进行了系统光谱测量，这些谱线由 pre-main- 产生。序列（PMS）恒星。此类恒星包括 T Tauri 和 Herbig AeBe 恒星，它们位于巨大的银河系恒星形成区域 NGC 3603。我们使用多目标光谱 (MOS) 模式从 JWST NIRSpec 获得的测量结果。基于文献中L _{acc_{和L _{Br _{γ之间现有的经验关系_{_{，我们使用我们的新测量结果首次制定了恒星吸积光度L _{acc_{与线光度L之间的经验关系_{_Pa}_{_{_α}}_{_{_{_和}}}_{_{_{_Br}}}_{_{_{_{_β}}}}_{_的}_{线_{_{_{_{_{。这些关系是：和。这些新的关系对于通过 JWST 建立大样本 PMS 恒星吸积率的粗略估计至关重要。}}}}}}}}}}}}}}}}}}

更新日期：2024-04-10

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