Free Astronomy Magazine September-October 2024

T hisartist’sconceptshowsthenovasystemHMSagittae(HMSge),whereawhitedwarfstarispulling materialfrom its red giant companion. This formsa blazing hot disk around thedwarf,whichcan un- predictablyundergoaspontaneousthermonuclearexplosionastheinfallofhydrogenfromtheredgiantgrowsdenser andreachesatippingpoint.Thesefireworksbetweencompanionstarsarefascinatingtoastronomersbyyielding insights into the physics and dynamics of stellar evolution in binary systems. [NASA, ESA, Leah Hustak (STScI)] ﻣﺠﻠﺔ FreeAstronomy ﺎﻟﻌﺮ ﺔ 49 - ﺳﺒﺘﻤﺒﺮ ﺃﻛﺘﻮﺑﺮ 2 0 2 4 ُﻈﻬﺮ ﻫﺬا اﻟﺮﺳﻢ اﻟﺘﺨ ﻠﻲ ﻧﻈﺎم اﻟﻤﺴﺘﻌﺮ ) HMSagittae (HMSge ﺣ ﺚ ﻘﻮم ﻧ ﻢ ﻗﺰم أﺑ ﺾ ﺴﺤﺐ اﻟﻤﻮاد ﻣﻦ رﻓ ﻘﮫ اﻟﻌﻤﻼق اﻷ ﻤﺮ وﻫـﺬا ﺸــ ﻞ ﻗﺮﺻــ ﺎً ﺎً ﺳــﺎﺧﻨ ﻣﺸـﺘﻌﻼ ﺣــﻮل اﻟﻘـﺰم ﻤﻜــﻦ أن ﺘﻌــﺮض ﺸـ ﻞ ﻏــ واﻟــﺬ ﻣﺘﻮﻗــﻊﻻﻧﻔﺠـﺎرﻧــﻮويﺣــﺮاري ــﺚ ﺗــ ﺣ ﺰداد ﻛﺜﺎﻓــﺔ ﺳــﻘﻮط ﻣــﻦ اﻟﻌﻤــﻼق اﻷ ﻤــﺮو ﺼــﻞ إﻟــﻰ ﻧﻘﻄــﺔ ــﺪروﺟ اﻟﻬ . ﺣﺮﺟــﺔ إن ﺗــﺪﻓﻘﺎت اﻟﻤــﺎ دة اﻟﻨﺠــﻮم اﻟﻤﺼـﺎﺣ ﺔ ﻣﺒﻬــﺮة ﻟﻌﻠﻤـﺎء اﻟﻔﻠــﻚ ﻣـﻦ ﺧــﻼل ﻫــﺬﻩ ﺑــ ﺗﻘﺪ ﻢ رؤىﻓﻲﻓ ﺎء ود ﻨﺎﻣ ﻜ ﺎت ﺗﻄﻮراﻟﻨﺠﻮم ﻓﻲ اﻷﻧﻈﻤﺔ اﻟﺜﻨﺎﺋ ﺔ ] . NASA, ESA, Leah Hustak (STScI [(