English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present narrow-, broad-band, and WISE archive images, and high- andintermediate-resolution long-slit spectra of K 4-37, a planetary nebula thathas never been analyzed in detail. Although K 4-37 appears bipolar, themorphokinematical analysis discloses the existence of three distinct axes andadditional particular directions in the object, indicating that K 4-37 is amulti-axis planetary nebula that has probably been shaped by several bipolaroutflows at different directions. A 4-6 M$_{\odot}$ main-sequence progenitor isestimated from the derived high nebular He and N abundances, and very high N/Oabundance ratio ($\sim$2.32). The general properties are compatible with K 4-37being a highly evolved planetary nebula located at $\sim$14 kpc. The WISE imageat 22 $\mu$m reveals K 4-37 to be surrounded by a large ($\sim$13$\times$8pc$^2$) elliptical detached shell probably related to material ejected from theAGB progenitor. The observed elliptical morphology suggests deformation of anoriginally spherical AGB shell by the ISM magnetic field or by the influence ofa companion. We compare K 4-37 and NGC 6309 and found remarkable similaritiesin their physical structure but noticeably different chemical abundances thatindicate very different progenitor mass. This strongly suggests that,irrespective of the initial mass, their (presumably binary) central stars haveshared a very similar mass ejection history.

History of the mass ejection in K 4-37: from the AGB to the evolved planetary nebula phase