S. Medina,2 M. Peña,2 C. Morisset,2 and G. Stasińska3
2 Instituto de Astronomía, UNAM, Apdo. Postal 70-264, 04510 Mexico, D. F., México (miriam@astroscu.unam.mx, morisset@astroscu.unam.mx, selene@astroscu.unam.mx).
3 Grazyna Stasinska: LUTH, Observatoire de Meudon, 5, place Jules Janssen, 92195 Meudon Cedex, France (grazyna.stasinska@obspm.fr).
Received 2005 August 8
Accepted 2005 December 6
RESUMEN
Se midieron y analizaron las velocidades de expansión (Vexp) de diferentes iones y el ancho en la base de las líneas en 24 nebulosas planetarias (NPs) con núcleo [WC] (WRPNe), 9 NPs ionizadas por WELS (WLPNe) y 14 NPs normales. El estudio comparativo del comportamiento cinemático de los objetos muestra que las WRPNe tienen Vexp 40-45% mayores y más turbulencia que las WLPNe y PNe normales. Las WLPNe tienen comportamiento cinemático muy similar a las NPs normales. Todos los objetos muestran Vexp que aumenta con los indicadores de edad (densidad nebular y temperatura de las estrellas), pero el efecto es mayor en las WRPNe evolucionadas, sugiriendo que el intenso viento estelar ha acelerado a la nebulosa por largo tiempo. En los objetos no-WR, la aceleración de la nebulosa se detiene cuando la estrella alcanza una temperatura del orden de 90,000 - 100,000 K y Vexp llega a un valor máximo de 30 kms-1. Las WRPNe alcanzan Vexp máximas del orden de 40 kms-1. Encontramos que Vexp(N+) es ligeramente mayor que Vexp(O++) en todo tipo de objetos, indicando que las nebulosas muestran aceleración en las capas externas.
ABSTRACT
Expansion velocities (Vexp) of different ions and line widths at the base of the 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 study of the kinematical behavior of the sample clearly demonstrates that WRPNe have on average 40-45% larger Vexp, and possibly more turbulence than WLPNe and ordinary 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 ordinary o PNe) show expansion velocities increasing with age indicators, for example <Vexp> is larger for low-density nebulae and also it is larger for nebulae around high temperature stars. This age effect is much stronger for evolved WRPNe, suggesting that the [WC] winds have been accelerating the nebulae for a long time, while for non-WRPNe the acceleration seems to stop at some point when the star reaches a temperature of about 90,000 - 100,000 K. Non-WR nebulae reach a maximum Vexp ≤ 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 average Vexp(N+) is slightly larger than Vexp(O++), indicating that the nebulae present acceleration of the external shells.
Key Words: PLANETARY NEBULAE: INDIVIDUAL: NGC 6369, M 1-32, BD+30°3639, K 2-16 — STARS: WOLF-RAYET.
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]]> Nota
1Based on data collected at the Observatorio Astronómico Nacional, San Pedro Mártir, B. C., México.
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