Narrow-band imagery of three planetary nebulae - A2, IC 289 and M 1-75

Details Narrow-band imagery of three planetary nebulae - A2, IC 289 and M 1-75 Narrow-band imagery of three planetary nebulae - A2, IC 289 and M 1-75

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..273h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 273-280.

Astronomy and Astrophysics

Astrophysics

9

Astronomical Photography, Faint Objects, Planetary Nebulae, Stellar Mass, H Alpha Line, H Beta Line, Narrowband

Scientific paper

Faint structures are detected for three planetary nebulae: A 2, M1-75 and IC 289, using narrow-band imagery performed at the 3.60 m CFHT with interference filters (FWHM from 4.7 to 10 Å), centred at the Hα, Hβ, [N II] 6583, [O III] 5007, He II 4686 emission lines. These outer envelopes could result from a multiple-shell formation process, owing to repeated material ejections by the central stars. Absolute fluxes are given within 20% accuracy for various wavelengths as well as estimates of the ionized mass which would correspond to the total mass since, according to Seaton (1966), planetaries with Rn > 0.1 pc should be optically thin.

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