The Timescale Correlation Method: Distances to Planetary Nebulae with Halos

Details The Timescale Correlation Method: Distances to Planetary Nebulae with Halos The Timescale Correlation Method: Distances to Planetary Nebulae with Halos

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...477..226h&link_type=abstract

Astrophysical Journal v.477, p.226

Astronomy and Astrophysics

Astronomy

18

Ism: Structure, Ism: Planetary Nebulae: General

Scientific paper

We present deep narrow-band CCD images of six PNe obtained with the Palomar 5 m telescope in the light of [N II] lambda 6584 + H alpha and [O III] lambda 5007. Several previously undetected structures are found, including faint multiple envelope structures surrounding three of the targets. The inclusion of these sources with data for other multiple envelope PNe published in the literature permit a statistical evaluation of the relationship between PN "shells" and the thermal pulses of the PN nucleus. In this paper, we investigate the dynamical timescale between successive envelopes, tau dyn, and the nuclear interpulse timescale, tau ip. Our results show that the deviations from the relation tau dyn = tau ip can be explained by the uncertainty in the Shklovsky distance to individual PNe, which is sigma _{d_{{sh}}}/d_{{sh}}~2 . By imposing the constraint that tau dyn = tau ip, we find that it is possible to derive a PN distance indicator, which we name the timescale correlation distance, dTC. The derivation for dTC is independent of ad hoc and often unsupported assumptions inherent to the Shklovsky method.

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