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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The population of planetary nebulae near the Galactic Centre: chemical abundances

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Author(s):
Cavichia, O. ; Costa, R. D. D. ; Maciel, W. J. ; Molla, M.
Total Authors: 4
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 468, n. 1, p. 272-290, JUN 2017.
Web of Science Citations: 3
Abstract

Planetary nebulae (PNe) constitute an important tool to study the chemical evolution of the Milky Way and other galaxies, probing the nucleosynthesis processes, abundance gradients and the chemical enrichment of the interstellar medium. In particular, Galactic bulge PNe (GBPNe) have been extensively used in the literature to study the chemical properties of this Galactic structure. However, the presently available GBPN chemical composition studies are strongly biased, since they were focused on brighter objects, predominantly located in Galactic regions of low interstellar reddening. In this work, we report physical parameters and abundances derived for a sample of 17 high-extinction PNe located in the inner 2 degrees of the Galactic bulge, based on low-dispersion spectroscopy secured at the Southern Astrophysical Research telescope using the Goodman spectrograph. The new data allow us to extend our data base including faint objects, providing chemical compositions for PNe located in this region of the bulge and an estimation for the masses of their progenitors to explore the chemical enrichment history of the central region of the Galactic bulge. The results show that there is an enhancement in the N/O abundance ratio in the Galactic Centre PNe compared with PNe located in the outer regions of the Galactic bulge. This may indicate recent episodes of star formation occurring near the Galactic Centre. (AU)

FAPESP's process: 07/07704-2 - Populations and evolution of the bulge and the central region of the galaxy
Grantee:Oscar Cavichia de Moraes
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 10/18835-3 - Planetary nebulae, stars and chemical evolution of stellar systems
Grantee:Roberto Dell'Aglio Dias da Costa
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/01017-1 - Chemical evolution of barred spiral galaxies and chemical abundances of planetary nebula towards the center of the Milky Way
Grantee:Oscar Cavichia de Moraes
Support type: Scholarships in Brazil - Post-Doctorate