New kinematic distances of NGC 7009 and BD+30°3639 from UV and radio data

Details New kinematic distances of NGC 7009 and BD+30°3639 from UV and radio data New kinematic distances of NGC 7009 and BD+30°3639 from UV and radio data

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.229..203m&link_type=abstract

Astrophysics and Space Science, Volume 229, Issue 2, pp.203-213

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

Measurements of the equivalent width of the interstellar Lymanα line from IUE spectra in the direction of the planetary nebulae NGC 7009 and BD+30°3639 are used to infer the H column density in these directions. Hydrogen 21 cm profiles are also used in connection with the ultraviolet data so that the expected rotation velocities and distances can be determined. The results are compared with recently published distances, in an attempt to distinguish between the “short” and “long” PN distance scales as applied to these objects.

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