Category Archives: 天文現象及活動

第十八屆中學生天文訓練計劃 – 望遠鏡觀星實習


天文儀器

讓本地中學生有機會接受較全面的天文學訓練,從中培養及深化其對自然科學的興趣。另一方面,亦希望參與計劃的同學能將所學回饋所屬學校,在校內協助推廣天文活動,讓更多同學能夠領略箇中樂趣。為達致上述目的,計劃內容將同時兼顧理論及實踐兩方面,務求讓同學不單獲得天文學上的知識及訓練,並且培養出獨立處理問題及組織活動的能力。

時間:2017.11.21(二) 18:30 ~ 21:00
地點:香港中文大學崇基學院鄧雁玲科學普及教育中心
名額:80
對象:2017~2018年度全日制中四或中五香港學生
語言:粵語,輔以英語

免費課程,惟參加者必須報名,2017.09.26截止,後由舉辦單位甄選取錄

此活動由中文大學、太空館及香港天文學會主辦。

講座系列:希臘星座神話 – 夏季星座神話


早在二千多年前的古希臘,當時的希臘人已經開始舉頭觀天,為天上的繁星起名。時至今日,我們仍然源用這套由希臘神話所演化出來的命名系統。但是,這些神話是怎樣發生的?為什麼會出現這些引人入勝的故事呢? 本講座為你講解希臘神話之由來,以及希臘神話之發展和每季星座之星座神話。另外更會介紹位於星座中的深空天體,務求讓大家於輕鬆的氣氛下聽故事之外亦可獲得有趣的天文知識。

時間:2017.11.21(二) 19:00 ~ 20:30
地點:香港太空館何鴻燊天象廳
講者:龍嘉穎 (天文匯資深天文導師)

免費活動,歡迎公眾參加,先到先得


此活動由香港太空館主辦。

潮汐瓦解事件的統一模型


Seminar:- A Unified Model for Tidal Disruption Events

In the centers of galaxies, scatterings between stars can kick a star into a fatal trajectory around the central supermassive black hole. The star approaches the black hole so closely that large tidal force can tear apart the star, and eventually half of the star is accreted onto the black hole producing a very luminous flare. This is called a tidal disruption event (TDE). Only in the past few years wide-field transient surveys have allowed us to get photometric and spectroscopic data on multiple candidate events. The recent breakthrough in TDE observations however have shone a spotlight on our incomplete theoretical understanding. While the physical processes in TDEs are universal, some observed TDEs radiated in thermal X-ray while others radiated in UV and optical. Moreover, only a small fraction of TDEs produced relativistic jets. The key theoretical component lacking so far in TDE studies is how the accretion and emission physics should be different from standard accretion scenarios, because in TDEs stellar debris is fed to the black hole at a rate beyond the Eddington limit. The speaker utilize state-of-the-art three-dimensional general relativistic radiation magneto hydrodynamics simulations to study the physics of this extremely dense, hot and luminous accretion. Besides showing general properties of super-Eddington accretion disks, outflows and jets, in this talk she will focus on showing how the viewing angle dependence of this accretion disk can provide a unification model for different classes of TDEs. 
 
時間:2017.11.21(二) 16:00
地點:香港大學 莊月明物理樓522室
講者:Dr. Jane Lixin Dai (Niels Bohr Institute, University of Copenhagen) 
語言:英語

免費講座,歡迎參加

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此活動由香港大學物理系主辦。