Planetary nebulae in M33: probes of asymptotic giant branch nucleosynthesis and interstellar medium abundances - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2010

Planetary nebulae in M33: probes of asymptotic giant branch nucleosynthesis and interstellar medium abundances

Résumé

We have obtained deep optical spectrophotometry of 16 planetary nebulae (PNe) in M33, mostly located in the central 2 kpc of the galaxy, with the Subaru and Keck telescopes. We have derived electron temperatures and chemical abundances from the detection of the [OIII]lambda4363 line for the whole sample. We have found one object with an extreme nitrogen abundance, 12+log(N/H) = 9.20, accompanied by a large helium content. After combining our data with those available in the literature for PNe and HII regions, we have examined the behaviour of nitrogen, neon, oxygen and argon in relation to each other, and as a function of galactocentric distance. We confirm the good correlation between Ne/H and O/H for the PNe in M33. Ar/H is also found to correlate with O/H. This strengthens the idea that at the metallicity of the bright PNe analysed in M33, which is similar to that found in the Large Magellanic Cloud, these elements have not been significantly modified during the dredge-up processes that take place during the asymptotic giant branch phase of their progenitor stars. We find no significant oxygen abundance offset between PNe and HII regions at any given galactocentric distance, despite the fact that these objects represent different age groups in the evolution of the galaxy. Combining the results from PNe and HII regions, we obtain a representative slope of the interstellar medium alpha element (O, Ar, Ne) abundance gradient in M33 of -0.025 +/- 0.006 dexkpc-1. Both PNe and HII regions display a large abundance dispersion at any given distance from the galactic centre. We find that the N/O ratio in the PNe is enhanced, relative to that in the HII regions, by approximately 0.8 dex.

Dates et versions

hal-03733240 , version 1 (21-07-2022)

Identifiants

Citer

Fabio Bresolin, Grazyna Stasinska, Jose M. Vílchez, J. D. Simon, E. Rosolowsky. Planetary nebulae in M33: probes of asymptotic giant branch nucleosynthesis and interstellar medium abundances. Monthly Notices of the Royal Astronomical Society, 2010, 404, pp.1679-1697. ⟨10.1111/j.1365-2966.2010.16409.x⟩. ⟨hal-03733240⟩
3 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More