High Energy Emissions from Young Stellar Objects

Journal of astrophysics and astronomy

A. C. Das1²  Ashok Ambastha2¹ 

[1] Udaipur Solar Observatory, Physical Research Laboratory, Udaipur 313 001, India$$;Physical Research Laboratory, Navarangpura, Ahmedabad 380 009, India$$

关键词: discs;    dusty plasma;    high energy emission;    stars.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

X-ray emissions from Young Stellar Objects (YSO) are detected by many X-ray missions that are providing important information about their properties. However, their emission processes are not fully understood. In this research note, we propose a model for the generation of emissions from a YSO on the basis of a simple interaction between the YSO and its surrounding circumstellar accretion disc containing neutral gas and charged dust. It is assumed that the YSO has a weak dipole type magnetic field and its field lines are threaded into the circumstellar disc. Considering the motion of ions and charged dust particles in the presence of neutral gas, we show that the sheared dust-neutral gas velocities can lead to a current along the direction of ambient magnetic field. Magnitude of this current can become large and is capable of generating an electric field along the magnetic field lines. It is shown how the particles can gain energy up to MeV range and above, which can produce high-energy radiations from the YSO.

【 授权许可】

Unknown