SHAO Astrophysics Colloquia


Title: stars in adolescence: wild accretion, manic depression, fits of irrational outbursts, and pimply spots
Speaker: Greg Herczeg (KIAA)
Time: Thursday, 3:00pm, June 26
Location: Lecture Hall, 3rd floor

Abstract: Classical T Tauri stars are the adolescents of stellar evolution. They are nearly fully formed, with a remnant disk and ongoing accretion that usually lasts 2 - 5 Myr. Some stars refuse to grow up, taking as long as 10 Myr before losing their disks and emerging toward maturity. Strong magnetic activity leads to pimply spots on the stellar surfaces. Some T Tauri stars are still hidden inside their disks, not yet ready to emerge. Manic mood swings change the appearance of the star and are often explained with stochastic accretion. Depression has been seen in lightcurves on timescales of days to years. Sometimes every classical T Tauri star seems as uniquely precious as a snowflake, but all stars ultimately emerge from this wild period into the uniformity of adulthood. I will describe the physics that drives the evolution from birth to adulthood, efforts to understand the stellar properties despite the wild teenage facade, and recent observations that are starting to reveal how planets form in circumstellar disks around adolescent stars.


Seminar talk 

题  目:磁星物理学---凝聚态物理和核物理在天体物理学中的应用
报告人:彭秋和 (南京大学)
时  间:6月24号周二上午10:00
地  点:中会议室


Research Center for Galaxy and Cosmology is the division engaging on the astrophysical research in Shanghai Astronomical Observatory. The research area includes cosmology, large scale structure, galaxy formation and evolution, the active galactic nucleus and compact objects, the star cluster and the structure of the Milk Way etc.

CGC participates in many international sky survey projects, including the LAMOST sky survey, the Sloan Digital Sky Survey IV ,BigBoss,LSST etc. CGC maintains close partnerships with many astronomical   research institutes.

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