Detailed Studies of IPHAS sources. II. Sab 19, a true planetary nebula and its mimic crossing the Perseus Arm.

DOI: 
10.1093/mnras/staa3082
Publication date: 
01/10/2021
Main author: 
Guerrero, M. A.
IAA authors: 
Guerrero, M. A.;Alfaro, E. J.
Authors: 
Guerrero, M. A.;Ortiz, R.;Sabin, L.;Ramos-Larios, G.;Alfaro, E. J.
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
501
Pages: 
3594-3604
Abstract: 
The INT Photometric Hα Survey (IPHAS) has provided us with a number of new-emission line sources, among which planetary nebulae (PNe) constitute an important fraction. Here we present a detailed analysis of the IPHAS nebula Sab 19 (IPHASX J055242.8+262116) based on radio, infrared, and optical images and intermediate- and high-dispersion longslit spectra. Sab 19 consists of a roundish 0.10 pc in radius double-shell nebula surrounded by a much larger 2.8 pc in radius external shell with a prominent H-shaped filament. We confirm the nature of the main nebula as a PN whose sub-solar N/O ratio abundances, low ionized mass, peculiar radial velocity, and low-mass central star allow us to catalog it as a type III PN. Apparently, the progenitor star of Sab 19 became a PN when crossing the Perseus Arm during a brief visit of a few Myr. The higher N/O ratio and velocity shift ≃40 km s<SUP>-1</SUP> of the external shell with respect to the main nebula and its large ionized mass suggest that it is not truly associated with Sab 19, but it is rather dominated by a Strömgren zone in the interstellar medium ionized by the PN central star.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020MNRAS.tmp.3111G/abstract
ADS Bibcode: 
2020MNRAS.tmp.3111G
Keywords: 
planetary nebulae: general;planetary nebulae: individual: Sab 19;Astrophysics - Solar and Stellar Astrophysics;Astrophysics - Astrophysics of Galaxies