Chemical Abundances in the Galactic Bulge

2006 ◽  
pp. 347-352
Author(s):  
Livia Origlia ◽  
R. Michael Rich
Keyword(s):  
Galactic Bulge ◽  
Chemical Abundances

scholarly journals Chemical Abundances in Galactic Bulge Pn

1993 ◽  
Vol 155 ◽  
pp. 581-581 ◽  
Author(s):  
N.A. Walton ◽  
M.J. Barlow ◽  
R.E.S. Clegg
Keyword(s):  
Galactic Disk ◽  
Planetary Nebulae ◽  
Solar Neighbourhood ◽  
Galactic Bulge ◽  
Low Resolution ◽  
Chemical Abundances ◽  
The Mean ◽  
Optical Spectrophotometry ◽  
High Metallicity

We present abundance determinations, in particular of carbon, and C/O ratios, for 11 Galactic bulge planetary nebulae (PN) based on our low resolution UV data from IUE observations and optical spectrophotometry from the Anglo-Australian Telescope. We compare the observed abundances with those predicted by dredge-up theory for the high metallicity Galactic bulge. The sample abundances are also contrasted with the abundances found for PN in the Galactic disk. The mean C/O ratio for the bulge PN is significantly lower than that found for Galactic disk PN. Further, we present an abundance analysis of the very metal-poor bulge PN M2-29. From an analysis of the differential extinction found from the observed ratios of the He ii 1640,4686Å lines, we find that the ultraviolet reddening law towards the bulge is steeper than in the solar neighbourhood.

A review of the chemical abundances and kinematics of the Galactic bulge

2013 ◽  
Vol 9 (S298) ◽  
pp. 28-39 ◽  
Author(s):  
Livia Origlia
Keyword(s):  
Galactic Center ◽  
State Of The Art ◽  
Complex Structure ◽  
Stellar Populations ◽  
Galactic Bulge ◽  
Future Perspectives ◽  
Chemical Abundances ◽  
Center Region ◽  
Infrared Surveys

AbstractThis review will attempt to draw a state of the art observational picture of the Galactic bulge. The main chemical, kinematic and evolutionary properties of the gas and stellar populations in the barred bulge and towards the Galactic center region will be discussed in the context of the possible formation scenarios. Future perspectives for our comprehension of the complex structure of the Galactic bulge from ongoing and foreseen optical and infrared surveys will be also highlighted.

scholarly journals The evolution of the Galactic bulge from planetary nebulae

2007 ◽  
Vol 3 (S245) ◽  
pp. 365-366
Author(s):  
Walter J. Maciel ◽  
R. D. D. Costa ◽  
A. V. Escudero
Keyword(s):  
Observational Data ◽  
Chemical Evolution ◽  
Planetary Nebulae ◽  
Observational Constraints ◽  
Galactic Bulge ◽  
Full Understanding ◽  
Chemical Abundances

AbstractWe have used our dataset on the abundances of planetary nebulae (PN) to study the chemical evolution of the Galactic bulge. We have derived several relations involving the chemical abundances and computed three classes of models for the Galactic bulge: (i) one-zone, single-infall models, (ii) one-zone, double-infall models and (iii) multizone, double infall models. We conclude that part of the observational data can be understood in terms of the simpler models, but the full understanding of all observational constraints can only be explained by more complex multizone models.

scholarly journals Globular Clusters in the Galactic Bulge

2016 ◽  
Vol 33 ◽  
Author(s):  
E. Bica ◽  
S. Ortolani ◽  
B. Barbuy
Keyword(s):  
Globular Clusters ◽  
Deep Understanding ◽  
Selective Absorption ◽  
Galactic Bulge ◽  
Chemical Abundances ◽  
Elemental Abundances ◽  
The Galaxy ◽  
Formation And Evolution ◽  
Future Work ◽  
Shed Light

AbstractA view of the Galactic bulge by means of their globular clusters is fundamental for a deep understanding of its formation and evolution. Connections between the globular cluster and field star properties in terms of kinematics, orbits, chemical abundances, and ages should shed light on different stellar population components. Based on spatial distribution and metallicity, we define a probable best list of bulge clusters, containing 43 entries. Future work on newly discovered objects, mostly from the VVV survey, is suggested. These candidates might alleviate the issue of missing clusters on the far side of the bulge. We discuss the reddening law affecting the cluster distances towards the centre of the Galaxy, and conclude that the most suitable total-to-selective absorption value appears to be RV=3.2, in agreement with recent analyses. An update of elemental abundances for bulge clusters is provided.

Chemical Abundances in Galactic Bulge PN

1993 ◽  
pp. 581-581 ◽  
Author(s):  
N. A. Walton ◽  
M. J. Barlow ◽  
R. E. S. Clegg
Keyword(s):  
Galactic Bulge ◽  
Chemical Abundances

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

2016 ◽  
Vol 12 (S323) ◽  
pp. 339-340
Author(s):  
M. Mollá ◽  
O. Cavichia ◽  
R. D. D. Costa ◽  
W. J. Maciel
Keyword(s):  
Luminosity Function ◽  
Planetary Nebulae ◽  
Galactic Centre ◽  
Physical Parameters ◽  
Chemical Compositions ◽  
Galactic Bulge ◽  
Chemical Abundances ◽  
Chemical Enrichment ◽  
History Of ◽  
Low Dispersion

AbstractIn this work, we report physical parameters and abundances derived for a sample of 15 high extinction planetary nebulae located in the inner 2° of the Galactic bulge, based on low dispersion spectroscopy secured at the SOAR telescope using the Goodman spectrograph. The new data allow us to extend our database including older, weaker objects that are at the faint end of the planetary nebulae luminosity function. The data provide chemical compositions for PNe located in this region of the bulge to explore the chemical enrichment history of the central region of the Galactic bulge. The results show that the abundances of our sample are skewed to higher metallicities than previous data in the outer regions of the bulge. This can indicate a faster chemical enrichment taking place at the Galactic centre.

scholarly journals Chemical Abundances and Dust in Planetary Nebulae in the Galactic Bulge

2008 ◽  
Vol 680 (2) ◽  
pp. 1206-1221 ◽  
Author(s):  
S. Gutenkunst ◽  
J. Bernard‐Salas ◽  
S. R. Pottasch ◽  
G. C. Sloan ◽  
J. R. Houck
Keyword(s):  
Planetary Nebulae ◽  
Galactic Bulge ◽  
Chemical Abundances

scholarly journals The Sulphur Abundance in Planetary Nebulae

2003 ◽  
Vol 209 ◽  
pp. 385-386
Author(s):  
Mezak A. Ratag
Keyword(s):  
Planetary Nebulae ◽  
Theoretical Models ◽  
Galactic Bulge ◽  
Chemical Abundances

Ratag et al (1997) determined the chemical abundances of He, O, N, Ne, S, Ar, and Cl in ~110 planetary nebulae which are likely to be in the Galactic Bulge. The abundances are derived by employing theoretical nebular models as interpolation devices in establishing the ICFs. The overall agreement between the abundances obtained by employing the model-ICFs and those derived from the theoretical models is reasonably good. Based on this, it is of interest to study the reliability of various ICFs as well as to derive some alternative ICFs. The focus of the present study is sulphur.

scholarly journals Li-rich giants in the Galactic Bulge. Is Li linked only to evolutionary status?

2009 ◽  
Vol 5 (S268) ◽  
pp. 333-334
Author(s):  
Oscar A. Gonzalez
Keyword(s):  
Evolutionary Status ◽  
Mixing Process ◽  
Galactic Bulge ◽  
Chemical Abundances ◽  
Synthetic Spectra ◽  
Upper Limits ◽  
Enrichment Process

AbstractIn our detailed study of chemical abundances in the Galactic bulge (see Zoccali et al. 2008 for a description of the entire project) we have measured Li abundances by fitting synthetic spectra to the 7Li (6707.18Å) line for ~400 giants in Baade's Window and a field at b=−6 (Gonzalez et al. 2009). We have found 13 stars showing strong 7Li lines in complete contrast to the rest of the sample for which only upper limits could be obtained. Our sample is at least 1.2 mag brighter than the expected RGB bump, therefore we interpreted our results as evidence for stars that might have avoided the observed extra-mixing process or undergoing a Li enrichment process not necessarily linked to the RGB bump.

Sign in / Sign up

Export Citation Format

Share Document