scholarly journals The Galactic Oxygen Abundance Gradient

1997 ◽  
Vol 481 (1) ◽  
pp. L47-L50 ◽  
Author(s):  
Stephen J. Smartt ◽  
William Robert J. Rolleston
Keyword(s):  
Oxygen Abundance ◽  
Abundance Gradient

scholarly journals Evidence for azimuthal variations of the oxygen-abundance gradient tracing the spiral structure of the galaxy HCG 91c

2017 ◽  
Vol 601 ◽  
pp. A61 ◽  
Author(s):  
F. P. A. Vogt ◽  
E. Pérez ◽  
M. A. Dopita ◽  
L. Verdes-Montenegro ◽  
S. Borthakur
Keyword(s):  
Spiral Structure ◽  
Oxygen Abundance ◽  
Abundance Gradient ◽  
The Galaxy

scholarly journals The time evolution of the Milky Way’s oxygen abundance gradient

2018 ◽  
Author(s):  
M Mollá ◽  
Á I Díaz ◽  
O Cavichia ◽  
B K Gibson ◽  
W J Maciel ◽  
...  
Keyword(s):  
Time Evolution ◽  
Oxygen Abundance ◽  
Abundance Gradient

The Stellar Oxygen Abundance Gradient in M33

1997 ◽  
Vol 474 (2) ◽  
pp. L107-L110 ◽  
Author(s):  
M. I. Monteverde ◽  
A. Herrero ◽  
D. J. Lennon ◽  
R.-P. Kudritzki
Keyword(s):  
Oxygen Abundance ◽  
Abundance Gradient

scholarly journals The oxygen abundance gradient in M81 and the robustness of abundance determinations in H ii regions

2015 ◽  
Vol 455 (3) ◽  
pp. 2627-2643 ◽  
Author(s):  
K. Z. Arellano-Córdova ◽  
M. Rodríguez ◽  
Y. D. Mayya ◽  
D. Rosa-González
Keyword(s):  
H Ii Regions ◽  
Oxygen Abundance ◽  
Abundance Gradient

scholarly journals Relations between abundance characteristics and rotation velocity for star-forming MaNGA galaxies

2019 ◽  
Vol 623 ◽  
pp. A122 ◽  
Author(s):  
L. S. Pilyugin ◽  
E. K. Grebel ◽  
I. A. Zinchenko ◽  
Y. A. Nefedyev ◽  
J. M. Vílchez
Keyword(s):  
Rotation Velocity ◽  
Effective Radius ◽  
Oxygen Abundance ◽  
Abundance Gradient ◽  
Star Forming ◽  
The Galaxy ◽  
Basic Parameters ◽  
Central Oxygen ◽  
The Mean ◽  
Optical Radius

We derive rotation curves, surface brightness profiles, and oxygen abundance distributions for 147 late-type galaxies using the publicly available spectroscopy obtained by the MaNGA survey. Changes of the central oxygen abundance (O/H)0, the abundance at the optical radius (O/H)R25, and the abundance gradient with rotation velocity Vrot were examined for galaxies with rotation velocities from 90 km s−1 to 350 km s−1. We find that each relation shows a break at Vrot∗ ∼ 200 km s−1. The central (O/H)0 abundance increases with rising Vrot and the slope of the (O/H)0–Vrot relation is steeper for galaxies with Vrot ≲ Vrot∗. The mean scatter of the central abundances around this relation is 0.053 dex. The relation between the abundance at the optical radius of a galaxy and its rotation velocity is similar; the mean scatter in abundances around this relation is 0.081 dex. The radial abundance gradient expressed in dex/kpc flattens with the increase of the rotation velocity. The slope of the relation is very low for galaxies with Vrot ≳ Vrot∗. The abundance gradient expressed in dex/R25 is roughly constant for galaxies with Vrot ≲ Vrot∗, flattens towards Vrot∗, and then again is roughly constant for galaxies with Vrot ≳ Vrot∗. The change of the gradient expressed in terms of dex/hd (where hd is the disc scale length), in terms of dex/Re, d (where Re, d is the disc effective radius), and in terms of dex/Re, g (where Re, g is the galaxy effective radius) with rotation velocity is similar to that for gradient in dex/R25. The relations between abundance characteristics and other basic parameters (stellar mass, luminosity, and radius) are also considered.

scholarly journals Oxygen Abundance and Stellar Populations in the Three Most Metal-Deficient Emission-Line Galaxies Known in the Local Universe: SBS 0335-052,E, SBS 0335-052 W and I Zw 18

2006 ◽  
Vol 2 (S235) ◽  
pp. 326-326 ◽  
Author(s):  
P. Papaderos ◽  
T. Yakobchuk ◽  
Y. I. Izotov ◽  
N. G. Guseva ◽  
K. J. Fricke
Keyword(s):  
Emission Line ◽  
Spatial Scale ◽  
Stellar Populations ◽  
Local Universe ◽  
Oxygen Abundance ◽  
Abundance Gradient ◽  
Spectroscopic Observations ◽  
Emission Line Galaxies ◽  
Line Galaxy

We present new spectroscopic observations of the system of the two blue compact dwarf (BCD) galaxies SBS 0335-052 W and SBS 0335-052 E with the 3.6m ESO telescope. The oxygen abundance in SBS 0335-052 W was determined to be 12 + log(O/H) = 7.13±0.08, confirming that this galaxy is the most metal-deficient emission-line galaxy known. We find that the oxygen abundance in SBS 0335-052 E varies from region to region in the range from 7.20 to 7.31, suggesting the presence of an abundance gradient over a spatial scale of ~1 kpc. Signatures of early carbon-type Wolf-Rayet stars are detected in cluster #3 of SBS 0335-052 E, corresponding to the emission of 20 to 130 WC4 stars, depending on the adopted luminosity of a single WC4 star in the Civ λ4658 emission line (Papaderos et al. 2006).

scholarly journals Characterizing the radial oxygen abundance distribution in disk galaxies

2019 ◽  
Vol 623 ◽  
pp. A7 ◽  
Author(s):  
I. A. Zinchenko ◽  
A. Just ◽  
L. S. Pilyugin ◽  
M. A. Lara-Lopez
Keyword(s):  
Surface Brightness ◽  
Disk Galaxies ◽  
Abundance Distribution ◽  
Oxygen Abundance ◽  
Abundance Gradient ◽  
Central Surface ◽  
The Galaxy ◽  
Axisymmetric Structures ◽  
Local Oxygen ◽  
Optical Radius

Context. The relation between the radial oxygen abundance distribution (gradient) and other parameters of a galaxy such as mass, Hubble type, and a bar strength, remains unclear although a large amount of observational data have been obtained in the past years. Aims. We examine the possible dependence of the radial oxygen abundance distribution on non-axisymmetrical structures (bar/spirals) and other macroscopic parameters such as the mass, the optical radius R25, the color g − r, and the surface brightness of the galaxy. A sample of disk galaxies from the third data release of the Calar Alto Legacy Integral Field Area Survey (CALIFA DR3) is considered. Methods. We adopted the Fourier amplitude A2 of the surface brightness as a quantitative characteristic of the strength of non-axisymmetric structures in a galactic disk, in addition to the commonly used morphologic division for A, AB, and B types based on the Hubble classification. To distinguish changes in local oxygen abundance caused by the non-axisymmetrical structures, the multiparametric mass–metallicity relation was constructed as a function of parameters such as the bar/spiral pattern strength, the disk size, color index g − r in the Sloan Digital Sky Survey (SDSS) bands, and central surface brightness of the disk. The gas-phase oxygen abundance gradient is determined by using the R calibration. Results. We find that there is no significant impact of the non-axisymmetric structures such as a bar and/or spiral patterns on the local oxygen abundance and radial oxygen abundance gradient of disk galaxies. Galaxies with higher mass, however, exhibit flatter oxygen abundance gradients in units of dex/kpc, but this effect is significantly less prominent for the oxygen abundance gradients in units of dex/R25 and almost disappears when the inner parts are avoided (R >  0.25R25). We show that the oxygen abundance in the central part of the galaxy depends neither on the optical radius R25 nor on the color g − r or the surface brightness of the galaxy. Instead, outside the central part of the galaxy, the oxygen abundance increases with g − r value and central surface brightness of the disk.

scholarly journals THE FLAT OXYGEN ABUNDANCE GRADIENT IN THE EXTENDED DISK OF M83

2009 ◽  
Vol 695 (1) ◽  
pp. 580-595 ◽  
Author(s):  
Fabio Bresolin ◽  
Emma Ryan-Weber ◽  
Robert C. Kennicutt ◽  
Quinton Goddard
Keyword(s):  
Oxygen Abundance ◽  
Abundance Gradient

scholarly journals A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA

2014 ◽  
Vol 563 ◽  
pp. A49 ◽  
Author(s):  
S. F. Sánchez ◽  
F. F. Rosales-Ortega ◽  
J. Iglesias-Páramo ◽  
M. Mollá ◽  
J. Barrera-Ballesteros ◽  
...  
Keyword(s):  
Oxygen Abundance ◽  
Abundance Gradient

scholarly journals Differential Abundances of B-type Supergiants in M33

1999 ◽  
Vol 192 ◽  
pp. 272-276
Author(s):  
M. I. Monteverde ◽  
A. Herrero
Keyword(s):  
H Ii Regions ◽  
Line Formation ◽  
Atmospheric Parameters ◽  
Oxygen Abundance ◽  
Abundance Gradient ◽  
Preliminary Results ◽  
Metal Abundances ◽  
Effective Temperatures ◽  
Abundance Determination

In previous papers we have published preliminary results on the stellar oxygen-abundance gradient in M33 by using B-type supergiants. In the following study, we include one new B-supergiant and derive effective temperatures and gravities for these stars. Determination of atmospheric parameters is based on analyses of silicon ionisation balance.Detailed non-LTE model atmospheres and non-LTE line formation calculations were used for the abundance determination of Si and O. Careful differential analyses are used to quantify the differences in metal abundances between M33 stars and MK spectral standards in our Galaxy.We compare our results with the abundances expected from studies of H II regions.

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