SciELO - Scientific Electronic Library Online

 
vol.47 número2Kinematics From Spectral Lines for AGN Outflows Based On Time-Independent Radiation-Driven Wind TheoryAtmospheric Aerosol Variability Over The Region of San Pedro Martir from Modis Data índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Revista mexicana de astronomía y astrofísica

versão impressa ISSN 0185-1101

Resumo

MACIEL, W. J.; RODRIGUES, T. S.  e  COSTA, R. D. D.. Kinematic Ages of the Central Stars of Planetary Nebulae. Rev. mex. astron. astrofis [online]. 2011, vol.47, n.2, pp. 401-407. ISSN 0185-1101.

The age distribution of the central stars of planetary nebulae (CSPN) is estimated using two methods based on their kinematic properties. First, the expected rotation velocities of the nebulae at their Galactocentric distances are compared with the predicted values from the rotation curve, and the differences are attributed to the different ages of the evolved stars. Adopting the relation between the ages and the velocity dispersions determined by the Geneva-Copenhagen survey, the age distribution can be derived. Second, the U, V, W, velocity components of the stars are determined, and the corresponding age-velocity dispersion relations are used to infer the age distribution. These methods have been applied to two samples of PN in the Galaxy. The results are similar for both samples, and show that the age distribution of the PN central stars concentrates at ages lower than 5 Gyr, peaking at about 1 to 3 Gyr.

Palavras-chave : planetary nebulae [general]; stars [AGB and Post-AGB]; stars [fundamental parameters]; stars [general].

        · resumo em Espanhol     · texto em Inglês     · pdf em Inglês