Results 31 to 40 of about 50,982 (241)
Oxygen, $\alpha$-element and iron abundance distributions in the inner part of the Galactic thin disc. II [PDF]
, 2016 We have derived the abundances of 36 chemical elements in one Cepheid star, ASAS 181024--2049.6, located R$_{\rm G}= 2.53$ kpc from the Galactic center. This star falls within a region of the inner thin disc poorly sampled in Cepheids.
Andrievsky, S. M. +4 more
core +1 more source
A comparison of metal and Ly-α absorption in galactic haloes [PDF]
Serbian Astronomical Journal, 1998 The metallicity structure of galactic haloes is one of the major unknowns in modern galactic astrophysics and observational cosmology. Hereby we outline a very simple method for obtaining at least a crude picture of gas abundances, based on ...
Ćirković M.M.
doaj +1 more source
Connecting the primordial and Galactic deuterium abundances [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 5 pages, 4 figures; accepted for publication in ...
Gary Steigman, D. Romano, M. Tosi
openalex +6 more sources
CNO abundances in the Galactic bulge [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractThe carbon, nitrogen, and oxygen abundances and trends in the bulge are discussed in the context of our recent analysis of these elements in an on-going project based on near-IR spectra (Rydeet al. 2009). We obtained these using the CRIRES spectrometer on the VLT. The formation and evolution of the Milky Way bulge can be constrained by studying
openaire +4 more sources
The distribution of the elements in the thin disc from classical Cepheids
EPJ Web of Conferences, 2012 Classical Cepheids are the most popular primary distance indicator. They allow us to determine the Galactic abundances gradients and to constrain the chemical enrichment of the thin disc.
Piersimoni A. +8 more
doaj +1 more source
Neon, sulphur and argon abundances of planetary nebulae in the sub-solar metallicity Galactic anti-centre [PDF]
, 2017 Context: Spectra of planetary nebulae show numerous fine structure emission lines from ionic species, enabling us to study the overall abundances of the nebular material that is ejected into the interstellar medium.
Bernard Salas, J. +2 more
core +3 more sources
Ages of evolved low mass stars: Central stars of planetary nebulae and white dwarfs
EPJ Web of Conferences, 2013 We have developed several methods to estimate the ages of central stars of planetary nebulae (CSPN), which are based either on observed nebular properties or on data from the stars themselves. Our goal is to derive the age distribution of these stars and
Costa R.D.D. +2 more
doaj +1 more source
Abundance structure of the Galactic disk
, 2006 8 pages, 6 figures, using the Mem SA It style file (included). Will be published as part of the proceedings from Joint Discussion 13 (Large Surveys) helt at the IAU Gen Assembly in Prague ...
S. Feltzing
openalex +4 more sources
Chemical Abundances in Galactic Bulge Pn [PDF]
Symposium - International Astronomical Union, 1993 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 ...
R. E. S. Clegg +2 more
openaire +2 more sources
Non-LTE Abundances of Magnesium, Aluminum and Sulfur in OB Stars Near the Solar Circle [PDF]
, 2002 Non-LTE abundances of magnesium, aluminum and sulfur are derived for a sample of 23 low-v \sin i stars belonging to six northern OB associations of the Galactic disk within 1 kpc of the Sun.
Afflerbach +21 more
core +3 more sources