Spectroscopic studies of four planetary nebulae with emission-line nuclei

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• 作者：M. A. Burlak ; A. Yu. Kniazev
• 关键词：planetary nebulae ; emission ; line central stars ; chemical composition
• 刊名：Astronomy Letters
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：39
• 期：10
• 页码：703-716
• 全文大小：832KB
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• 作者单位：M. A. Burlak (1)
  A. Yu. Kniazev (1) (2) (3)
  
  1. Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia
  2. South African Astronomical Observatory, Cape Town, Republic of South Africa
  3. Southern African Large Telescope Foundation, Cape Town, Republic of South Africa
  
• ISSN：1562-6873

文摘

Spectroscopic observations of four planetary nebulae (PNe) with emission-line central stars of different spectral types are presented: Cn 1-5, Pe 1-1, NGC 5873, and M1-19. The interstellar extinction, physical conditions (n e , T e ), and abundances of several elements (He, N, O, Ne, S, Ar, Cl) have been determined for all nebulae. The nebula Cn 1- with fairly high abundances of helium and nitrogen is shown to belong to type I PNe. Possible variability of the intensities of low-excitation emission lines in NGC 5873 has been found; it can be related to variations of the stellar wind from the central star. The measured α-element abundance ratios (S/O, Ne/O, Ar/O, Cl/O) are in good agreement with those typical of HII regions.