Bipolar Nebulae: The Missing Population

Details Bipolar Nebulae: The Missing Population Bipolar Nebulae: The Missing Population

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasp..113..846p&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 113, Issue 785, pp. 846-850.

Astronomy and Astrophysics

Astronomy

8

Ism: Jets And Outflows, Ism: Planetary Nebulae: General

Scientific paper

We have undertaken an analysis of observed aspect ratios for the collimation disks in bipolar nebulae (BPNe). We find, as a result, that most such structures are likely to have a ratio of thickness to diameter b/a~0.23. Similarly, the paucity of disks having aspect ratios >=0.7 implies that many of the sources are either unobserved or, what is more probably the case, misidentified. It seems likely, as a result, that the true population of BPNe is ~1.7 times greater than previously supposed. Similarly, we determine that as many as of 43% of annular or ringlike planetaries may represent bipolar sources oriented along the line of sight.

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