Free Astronomy Magazine July-August 2022 ARABIC VERSION

T white dwarf in the centre of the image is made up of material, mostly hydrogen, stolen from its companion star. To- his artist’s impression shows a two-star system where micronovae may occur. The blue disc swirling around the bright wards the centre of the disc, the white dwarf uses its strong magnetic fields to funnel the hydrogen towards its poles. As the material falls on the hot surface of the star, it triggers a micronova explosion, contained by the magnetic fields at one of the white dwarf’s poles. [ESO/M. Kornmesser, L. Calçada] ﻤاﻟ ﻜﺮوﻧﻮﻓﺎ , ﻧﻮع ﺟﺪ ﺪ ﻣﻦ اﻻﻧﻔﺠﺎرات اﻟﻨ ﻤ ﺔ : ﻘﻠﻢ ﺎر ﺮا ﻓ ﺮا اﻟﻤﺮﺻﺪ اﻷوروﺑﻲ ا ﻨﻮﺑﻲ رﺻـﺪ ﻓﺮﻳـﻖ ﻣـﻦ ﻋﻠﻤـﺎء اﻟﻔﻠـﻚ ﲟﺴـﺎﻋﺪة اﻟﺘﻠﺴــﻜﻮب اﻟﻜﺒـﲑ ﺟــﺪًا اﻟﺘــﺎﺑﻊ ﻟﻠ ﺻــﺪ اﻷوروﰊ اﳉﻨـﻮﰊ ) ESO's VLT ( ، ﻧﻮﻋًــﺎ ﺟﺪﻳﺪًا ﻣـﻦ اﻻﻧﻔﺠـﺎر اﻟﻨﺠﻤـﻲ اﳌ ﻴﻜﺮوﻧﻮﻓـﺎ ﺗﺤــﺪث ﻫـــﺬه اﻻﻧ ﻔﺠـــﺎرات ﻋـــﲆ ﺳـــﻄﺢ ﺑﻌﺾ اﻟﻨﺠﻮم وﳝﻜﻦ ﻟﻜﻞ ﻣﻨﻬـﺎ أن ﻳﺤـ ﺮق ﺣـــﻮاﱄ ٣.٥ ﻣﻠﻴـــﺎر ﻣـــﻦ اﳌـــﻮاد اﻟﻨﺠﻤﻴـــﺔ ﺑﺤﺠـﻢ أﻫﺮاﻣـﺎت اﳉـﲒة اﻟﻌﻈﻴﻤـﺔ وذﻟـﻚ ﻏﻀـﻮن ﺑﻀـﻌﺔ ﺳــﺎﻋﺎت ﻗﻠﻴﻠــﺔ ﻓﻘـﻂ ـــــــــــــــــــــــــــــ ﻈﻬـﺮا ـﺚ ﻤﻜـﻦ أن ﺗﺤـﺪث اﻧﻔﺠــﺎرات اﻟﻤ ﻜﺮوﻧﻮﻓـﺎ ﻧﻈـﺎم ﻧ ﻤـﻲﺛﻨـﺎﺋﻲﺣ ﻟﺮﺳـﻢ اﻟﻔـ . ــﺪورﺣـﻮل اﻟﻘـﺰم اﻷﺑـ ﺾاﻟﻼﻣـﻊ ﻓـﻲ ـﻮن اﻟﻘـﺮصاﻷزرق اﻟـﺬ ﺘ وﺳﻂ اﻟﺼﻮرة ﻣﻦﻣﺎدة ﺳُﺮﻗﺖﻣﻦ اﻟﻨ ﻢ اﻟﻤﺮاﻓـﻖ ﻟـﮫ ﻣﻌﻈﻤﻬﺎ ﻣﻦ اﻟﻬ ﺪروﺟ . ﺎﺗﺠـﺎﻩ ﻣﺮﻛـﺰاﻟﻘـﺮص ﺴـﺘﺨﺪم اﻟﻘـﺰم اﻷﺑـ ﺾﻣﺠﺎﻻﺗـﮫ اﻟﻤﻐﻨﺎﻃ ﺴـ ﺔ اﻟﻘﻮ ﺔ ﻟ ﻧﺤﻮ أﻗﻄﺎ ﮫ ﺘﻮﺟ ﮫ اﻟﻬ ﺪروﺟ ﻓ ، ﻌﻨﺪﻣﺎ ﺗﺴﻘﻂ اﻟﻤﺎدة ﻋﻠﻰاﻟﺴﻄﺢ اﻟﺴﺎﺧﻦ ﻟﻠﻨ ﻢ إﻟـﻰاﻧﻔﺠـﺎر ﻓﺈﻧﻬـﺎ ﺗـﺆد اﻟ ﻤ ﻜﺮوﻧﻮﻓـﺎ ـﺎ ﻘﻮل ﻳﺤﺘـﻮى اﻟﻤﻐﻨﺎﻃ ﺴ ﺔ ﻓﻲأﺣﺪ أﻗﻄﺎب اﻟﻘﺰم اﻷﺑ ﺾ . [ESO/M. Kornmesser, L. Calçada] ﻣﺠﻠﺔ Astronomy ﺎﻟﻌﺮ ﺔ ﻳﻮﻟﻴﻮ – أﻏﺴﻄﺲ 2022 ٣٠