Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 501, Issue 3, Pages 3594-3604Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3082
Keywords
planetary nebulae: general; planetary nebulae: individual: Sab 19; stars: AGB and post-AGB
Categories
Funding
- Spanish Government Ministerio de Ciencia, Innovacion y Universidades (MCIU) [PGC2018-102184-B-I00]
- DGAPA, UNAM PAPIIT [IN101819]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT) [263373]
- Programa para el Desarrollo Profesional (PRODEP) Mexico
- MCIU [PGC2018-095049-B-C21]
- State Agency for Research of the Spanish MCIU through the Center of Excellence Severo Ochoa [SEV-2017-0709]
- National Aeronautics and Space Administration
- GRANTECAN
- National Plan of Astronomy and Astrophysics of the Spanish Government
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Sab 19 is a planetary nebula consisting of an inner double-shell nebula with a small radius and an outer shell with a larger radius. Analysis of its sub-solar N/O ratio abundances, low ionized mass, peculiar radial velocity, and low-mass central star classifies it as a Type III planetary nebula, indicating that the main nebula evolved from crossing the Perseus Arm.
The INT Photometric H alpha 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 long-slit 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 catalogue 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 similar or equal to 40 km s(-1) 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 Stromgren zone in the interstellar medium ionized by the PN central star.
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