Galactic planetary nebulae with wolf-rayet nuclei III. kinematical analysis of a large sample of nebulae
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2006
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| _version_ | 1876442818088534016 |
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| author | S. Medina |
| author_facet | S. Medina |
| contents | Galactic planetary nebulae with wolf-rayet nuclei III. kinematical analysis of a large sample of nebulae S. Medina M. Peña C. Morisset G. Stasinska Física, Astronomía y Matemáticas 32 16 M 1 K 2 RAYET Expansion velocities (Vexp) of different ions and line widths at the base ofthe lines are measured and analyzed for 24 PNe with [WC]-type nuclei (WRPNe),9 PNe ionized by WELS (WLPNe) and 14 ordinary PNe. A comparative studyof the kinematical behavior of the sample clearly demonstrates that WRPNe haveon average 40{45% larger Vexp, and possibly more turbulence than WLPNe andordinary PNe. WLPNe have velocity fields very much like the ones of ordinary PNe,rather than the ones of WRPNe. All the samples (WRPNe, WLPNe and ordinaryPNe) show expansion velocities increasing with age indicators, for example <Vexp>is larger for low-density nebulae and also it is larger for nebulae around hightemperaturestars. This age effect is much stronger for evolved WRPNe, suggestingthat the [WC] winds have been accelerating the nebulae for a long time, while fornon-WRPNe the acceleration seems to stop at some point when the star reachesa temperature of about 90,000 - 100,000 K. Non-WR nebulae reach a maximumVexp _ 30 kms_1 while evolved WRPNe reach maximum Vexp of about 40 kms_1.For all kinds of objects (WRPNe and non-WRPNe) it is found that on averageVexp(N+) is slightly larger than Vexp(O++), indicating that the nebulae presentacceleration of the external shells. 2006 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57142107 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.42 |
| format | Artículo científico |
| id | redalyc_57142107 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Galactic planetary nebulae with wolf-rayet nuclei III. kinematical analysis of a large sample of nebulae S. Medina Física, Astronomía y Matemáticas 32 16 M 1 K 2 RAYET Galactic planetary nebulae with wolf-rayet nuclei III. kinematical analysis of a large sample of nebulae S. Medina M. Peña C. Morisset G. Stasinska Física, Astronomía y Matemáticas 32 16 M 1 K 2 RAYET Expansion velocities (Vexp) of different ions and line widths at the base ofthe lines are measured and analyzed for 24 PNe with [WC]-type nuclei (WRPNe),9 PNe ionized by WELS (WLPNe) and 14 ordinary PNe. A comparative studyof the kinematical behavior of the sample clearly demonstrates that WRPNe haveon average 40{45% larger Vexp, and possibly more turbulence than WLPNe andordinary PNe. WLPNe have velocity fields very much like the ones of ordinary PNe,rather than the ones of WRPNe. All the samples (WRPNe, WLPNe and ordinaryPNe) show expansion velocities increasing with age indicators, for example <Vexp>is larger for low-density nebulae and also it is larger for nebulae around hightemperaturestars. This age effect is much stronger for evolved WRPNe, suggestingthat the [WC] winds have been accelerating the nebulae for a long time, while fornon-WRPNe the acceleration seems to stop at some point when the star reachesa temperature of about 90,000 - 100,000 K. Non-WR nebulae reach a maximumVexp _ 30 kms_1 while evolved WRPNe reach maximum Vexp of about 40 kms_1.For all kinds of objects (WRPNe and non-WRPNe) it is found that on averageVexp(N+) is slightly larger than Vexp(O++), indicating that the nebulae presentacceleration of the external shells. 2006 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57142107 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.42 |
| title | Galactic planetary nebulae with wolf-rayet nuclei III. kinematical analysis of a large sample of nebulae |
| topic | Física, Astronomía y Matemáticas 32 16 M 1 K 2 RAYET |
| url | https://www.redalyc.org/articulo.oa?id=57142107 |