Bulg. J. Phys. vol.27 no.S1 (2000), pp. 062-065



Narrow-Band Imaging of the Wind-Blown Bubbles NGC 2359 and NGC 7635

B. Efremova1, V. Golev1, T. Bonev2
1Astronomy Department, Sofia University
2Institute of Astronomy, Bulgarian Academy of Sciences
Abstract. We present a narrow-band imaging of the wind-blown bubbles NGC 2359 and NGC 7635. More than 50 images where obtained in the interference filters centered near the following emission lines: [O III] λ 5007; [O I] λ 6300; Hα λ 6563; He I λ 6678; [S II] λ λ 6716, 6731; [S III] λ 3722 ÷ [O II] λ λ 3726, 3729; [S II] λ λ 4069, 4076. The obtained images are flux-calibrated and the ratios of certain emission lines are made to obtain the maps of ionization structure, electron temperature and electron density of the nebulae.

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