Comparison of two methods for determining the interstellar extinction of planetary nebulae

Details Comparison of two methods for determining the interstellar extinction of planetary nebulae Comparison of two methods for determining the interstellar extinction of planetary nebulae

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..486s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 486-500.

Astronomy and Astrophysics

Astrophysics

29

Interstellar Extinction, Planetary Nebulae, Balmer Series, Charge Coupled Devices, H Ii Regions, Stellar Envelopes

Scientific paper

A comparison of the planetary nebulae as derived from the Balmer decrement and from the ratio of radio and H-beta fluxes is presented on the basis of a compilation of all the relevant radio and optical measurements and a serious selection of the best data. It is shown that the extinction determined from the Balmer decrement is systematically larger than the one derived from the radio data, the slope of the (Copt, Crad) relation being about 1.2. It is argued that, for most distant planetary nebulae, the total to selection extinction is significantly lower than 3, the value corresponding to the standard extinction law for the interstellar medium.

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