Detailed Studies of IPHAS sources. II. Sab 19, a true planetary nebula and its mimic crossing the Perseus Arm.
Detailed Studies of IPHAS sources. II. Sab 19, a true planetary nebula and its mimic crossing the Perseus Arm.
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IPHAS 来源的详细研究。Sab 19，一个真正的行星状星云及其穿过英仙臂的模拟。
DOI：
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发表时间：
2020
影响因子：
4.8
通讯作者：
Universidad de Guadalajara
中科院分区：
文献类型：
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作者：
Martín A. Guerrero;Roberto Ortiz;Laurence Sabin;G. Ramos;Emilio J Alfaro Instituto de Astrofisica de Andalucia;Iaa;Escola de Artes;Ciencias e Humanidades;U. S. Paulo;I. D. Astronomia;Unam;Instituto de Astronomia y Meteorologia;Cucei;Universidad de Guadalajara
国际光度测量（IPHAS）为我们提供了许多新的发射线源，其中行星状星云（PNe）是一个重要的组成部分。本文对IPHAS星云Sab 19 （IPHASX J055242.8+262116）的射电、红外和光学图像以及中、高色散长缝光谱进行了详细的分析。Sab 19由一个半径为0.10个百分点的圆形双壳星云组成，周围是一个半径为2.8个百分点的大得多的外壳，上面有一个突出的h形灯丝。我们确认主星云的性质是一个PN，它的亚太阳N/O比丰度、低电离质量、特殊的径向速度和低质量的中心恒星使我们能够将其归类为III型PN。很明显，Sab 19的前身恒星在几个Myr的短暂访问中穿越英仙座臂时成为了一颗PN。相对于主星云的高N/O比率和大的电离质量，外壳的速度移到40 km s−1，表明它不是真正与Sab 19有关，而是由PN中心星电离的星际介质中的Strömgren区所主导。
The INT Photometric Hα Survey (IPHAS) has provided us with a number of new-emission line sources, among which planetary nebulae (PNe) constitute an important fraction. Here we present a detailed analysis of the IPHAS nebula Sab 19 (IPHASX J055242.8+262116) based on radio, infrared, and optical images and intermediate- and high-dispersion longslit spectra. Sab 19 consists of a roundish 0.10 pc in radius double-shell nebula surrounded by a much larger 2.8 pc in radius external shell with a prominent H-shaped filament. We confirm the nature of the main nebula as a PN whose sub-solar N/O ratio abundances, low ionized mass, peculiar radial velocity, and low-mass central star allow us to catalog it as a type III PN. Apparently, the progenitor star of Sab 19 became a PN when crossing the Perseus Arm during a brief visit of a few Myr. The higher N/O ratio and velocity shift ≃40 km s−1 of the external shell with respect to the main nebula and its large ionized mass suggest that it is not truly associated with Sab 19, but it is rather dominated by a Strömgren zone in the interstellar medium ionized by the PN central star.