Sodium excess in yellow supergiants: Implications for rotational mixing in massive main-sequence stars

被引：10

作者：

Denissenkov, PA ^{[1
]}

机构：

[1] Univ Victoria, Dept Phys & Astron, Victoria, BC V8W 3P6, Canada

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 622卷 / 02期

关键词：

stars : abundances; stars : evolution; stars : interiors; stars : rotation;

D O I：

10.1086/428393

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent high-quality measurements of the sodium abundance in yellow supergiants are used to test the hypothesis of rotational mixing in massive main-sequence stars. It is shown that the Na excess in a large fraction of yellow supergiants with M greater than or similar to 7-10 M-circle dot can only be understood as a result of mixing of Na between the convective core and the radiative envelope in their main-sequence progenitors. We demonstrate that the vertical turbulent diffusion from the Zahn model could be responsible for this extra mixing.

引用

页码：1058 / 1067

页数：10

共 33 条

[1] Sodium enrichment of stellar atmospheres - I. Non-variable supergiants and bright giants [J].

Andrievsky, SM ;

Egorova, IA ;

Korotin, SA ;

Burnage, R .

ASTRONOMY & ASTROPHYSICS, 2002, 389 (02) :519-523

[2] A compilation of charged-particle induced thermonuclear reaction rates [J].

Angulo, C ;

Arnould, M ;

Rayet, M ;

Descouvemont, P ;

Baye, D ;

Leclercq-Willain, C ;

Coc, A ;

Barhoumi, S ;

Aguer, P ;

Rolfs, C ;

Kunz, R ;

Hammer, JW ;

Mayer, A ;

Paradellis, T ;

Kossionides, S ;

Chronidou, C ;

Spyrou, K ;

Degl'Innocenti, S ;

Fiorentini, G ;

Ricci, B ;

Zavatarelli, S ;

Providencia, C ;

Wolters, H ;

Soares, J ;

Grama, C ;

Rahighi, J ;

Shotter, A ;

Rachti, ML .

NUCLEAR PHYSICS A, 1999, 656 (01) :3-183

[3]

Boyarchuk A. A., 1988, Astrophysics, V28, P202, DOI 10.1007/BF01004070

[4]

Boyarchuk A. A., 1983, IZV KRYM ASTROFIZ OB, V66, P130

[5] THERMONUCLEAR REACTION-RATES .5. [J].

CAUGHLAN, GR ;

FOWLER, WA .

ATOMIC DATA AND NUCLEAR DATA TABLES, 1988, 40 (02) :283-334

[6]

CHABOYER B, 1992, ASTRON ASTROPHYS, V253, P173

[7]

DENISENKOV PA, 1987, SOV ASTRON LETT+, V13, P214

[8]

DENISENKOV PA, 1988, SOV ASTRON LETT+, V14, P435

[9]

Denissenkov PA, 1999, ASTRON ASTROPHYS, V341, P181

[10] Canonical extra mixing in low-mass red giants [J].

Denissenkov, PA ;

VandenBerg, DA .

ASTROPHYSICAL JOURNAL, 2003, 593 (01) :509-523

← 1 2 3 4 →