论文标题
紧凑的行星星云MAC 2-1和SP 4-1：光电离模型和灰尘特征
Compact planetary nebulae MaC 2-1 and Sp 4-1: Photoionization models and dust characteristics
论文作者
论文摘要
我们研究行星星云（PNE），MAC 2-1和SP 4-1的特征。我们使用在2 m喜马拉雅chandra望远镜，Spitzer Mid-Infrade（Mid-IR）光谱，HST图像和IR光度计数据下拍摄的光谱。这些PNE尚未在较早的详细信息中进行单独研究。两种PNE都在低至中等兴奋的类别中。 MAC 2-1显示了碳化硅（SIC）和硫化镁（MGS）灰尘的存在。 SP 4-1寄主多环芳烃（PAH）分子。我们从光学和MID-IR发射线通量中获得PNE的血浆特性。我们计算PNE的光电离世模型，以估算与中心恒星和星云相关的物理参数的自洽估计，包括nebular丰度。从IR数据的建模中，我们获得了星云中形成的灰尘和分子的特征。从我们的研究中，我们估计Mac 2-1和SP 4-1的祖细胞的质量分别为1.2和1.55 $ m _ {\ sun} $，它们似乎都在金属贫困的环境中出生。两者都是遥远的PNE，Mac 2-1和SP 4-1的估计距离分别为16和18 kpc。
We study the characteristics of planetary nebulae (PNe), MaC 2-1 and Sp 4-1. We use our optical spectra taken at 2 m Himalayan Chandra Telescope, Spitzer mid-infrared (mid-IR) spectra, HST images, and IR photometric data. These PNe have not been individually studied in details earlier. Both the PNe are in the low- to moderate-excitation class. MaC 2-1 shows the presence of silicon carbide (SiC) and magnesium sulphide (MgS) dust. Sp 4-1 hosts polycyclic aromatic hydrocarbon (PAH) molecules. We obtain plasma properties of the PNe from the optical and mid-IR emission line fluxes. We compute photoionization models of the PNe for self-consistent estimation of physical parameters associated with the central star and the nebula, including nebular abundances. From the modelling of the IR data, we obtain the characteristics of dust and molecules formed in the nebulae. From our study, we estimate that the progenitors of MaC 2-1 and Sp 4-1 had masses of 1.2 and 1.55 $M_{\sun}$, respectively, and both of them seem to have born in metal poor environment. Both are distant PNe, with the estimated distances of 16 and 18 kpc for MaC 2-1 and Sp 4-1, respectively.
