Barium in Cepheids: new data on the abundance distribution in the Galactic disc

被引：14

作者：

Andrievsky, S. M. ^{[1
,2
,3
,4
,5
]}

Luck, R. E. ^{[1
]}

Korotin, S. A. ^{[2
,3
,4
]}

机构：

[1] Case Western Reserve Univ, Dept Astron, Cleveland, OH 44106 USA

[2] Odessa Natl Univ, Dept Astron, UA-65014 Odessa, Ukraine

[3] Odessa Natl Univ, Astron Observ, UA-65014 Odessa, Ukraine

[4] Isaac Newton Inst Chile, UA-65014 Odessa, Ukraine

[5] Univ Paris Diderot, CNRS, Observ Paris Meudon, GEPI, F-92125 Meudon, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 437卷 / 03期

关键词：

stars: abundances; stars: variables: Cepheids; Galaxy: disc; Galaxy: evolution; NEUTRON-CAPTURE; CROSS-SECTIONS; S-PROCESS; STARS; GALAXY;

D O I：

10.1093/mnras/stt1992

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using an Non-Local Thermodynamic Equilibrium (NLTE) analysis and a homogenous spectral data base, we have determined Ba abundances in a sample of 210 Galactic Cepheids and related objects. We confirm the previous result reported in Andrievsky et al. that the barium distribution in the range of Galactocentric distances from 5 to 18 kpc shows very small gradient value. The value determined here - d[Ba/H]/dR approximate to -0.01 dex kpc(-1) - is smaller than that for other s-process elements, such as La, Pr, Nd and Sm (Luck & Lambert), that typically show gradients of -0.03 dex kpc(-1).

引用

页码：2106 / 2110

页数：5

共 14 条

[1] Barium abundances in Cepheids [J].

Andrievsky, S. M. ;

Lepine, J. R. D. ;

Korotin, S. A. ;

Luck, R. E. ;

Kovtyukh, V. V. ;

Maciel, W. J. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013, 428 (04) :3252-3261

[2] Evolution of the barium abundance in the early Galaxy from a NLTE analysis of the Ba lines in a homogeneous sample of EMP stars [J].

Andrievsky, S. M. ;

Spite, M. ;

Korotin, S. A. ;

Spite, F. ;

Francois, P. ;

Bonifacio, P. ;

Cayrel, R. ;

Hill, V. .

ASTRONOMY & ASTROPHYSICS, 2009, 494 (03) :1083-1090

[3] Using Cepheids to determine the galactic abundance gradient -: I.: The solar neighbourhood [J].

Andrievsky, SM ;

Kovtyukh, VV ;

Luck, RE ;

Lépine, JRD ;

Bersier, D ;

Maciel, WJ ;

Barbuy, B ;

Klochkova, VG ;

Panchuk, VE ;

Karpischek, RU .

ASTRONOMY & ASTROPHYSICS, 2002, 381 (01) :32-50

[4] Neutron capture in low-mass asymptotic giant branch stars:: Cross sections and abundance signatures [J].

Arlandini, C ;

Käppeler, F ;

Wisshak, K ;

Gallino, R ;

Lugaro, M ;

Busso, M ;

Straniero, O .

ASTROPHYSICAL JOURNAL, 1999, 525 (02) :886-900

[5]

BRAND J, 1993, ASTRON ASTROPHYS, V275, P67

[6] THE HEAVY ELEMENT YIELDS OF NEUTRON-CAPTURE NUCLEOSYNTHESIS [J].

CAMERON, AGW .

ASTROPHYSICS AND SPACE SCIENCE, 1982, 82 (01) :123-131

[7] Barium Stars: Theoretical Interpretation [J].

Husti, Laura ;

Gallino, Roberto ;

Bisterzo, Sara ;

Straniero, Oscar ;

Cristallo, Sergio .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA, 2009, 26 (03) :176-183

[8]

Kovtyukh VV, 1999, ASTRON ASTROPHYS, V351, P597

[9]

Kurucz R.L., 1992, IAU Symposium, P225

[10] THE DISTRIBUTION OF THE ELEMENTS IN THE GALACTIC DISK. III. A RECONSIDERATION OF CEPHEIDS FROM l=30° TO 250° [J].

Luck, R. Earle ;

Lambert, David L. .

ASTRONOMICAL JOURNAL, 2011, 142 (04)

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