The Impact of Nova Outbursts on the Chemical Abundance of the Interstellar Medium  

作　　者：Guoli He Chunhua Zhu Guoliang Lü Lin Li Sufen Guo Helei Liu Jun Gao 

机构地区：[1]School of Physical Science and Technology,Xinjiang University,Urumqi 830017,China [2]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China

出　　处：《Research in Astronomy and Astrophysics》2024年第10期116-129,共14页天文和天体物理学研究（英文版）

摘　　要：Nova outbursts are the results of thermonuclear runaways,which occur when sufficient material accretes on the surfaces of white dwarfs(WDs).Using the MESA code,we construct a detailed grid for carbon-oxygen and oxygen-neon-magnesium novae.By employing population synthesis methods,we conduct a statistical analysis of the distribution of novae in the Milky Way.In our models,on average,a typical nova system may undergo about8000 eruptions and the Galactic nova rate is~130 yr^(-1).The C,N,and O elements in nova ejecta are strongly affected by the mixing degree between WD core and accreted material.Our results show that the average value of^(12)C/^(13)C in nova ejecta is about an order of magnitude lower than that on the surface of a red giant,that for^(16)O/^(17)O is about 5 times lower,and that for^(14)N/^(15)N is about 1.5 times lower.The annual yields of^(13)C,^(15)N,and^(17)O from nova ejection are larger than those from AGB stars.This indicates that compared to a red giant,nova eruptions are a more important source of the odd-numbered nuclear elements of^(13)C,^(15)N,and^(17)O in the Galactic interstellar medium.

关 键 词：ISM:abundances (stars:)novae cataclysmic variables (stars:)white dwarfs 

分 类 号：P145.3[天文地球—天体物理] P156[天文地球—天文学]