Free Astronomy Magazine November-December 2026 ARABIC VERSION

- had few opportunities to catch the actual moment of assembly. AninternationalteamledbyYichen ZhangofShanghaiJiaoTongUniver- sitysetouttochangethatbystudy-ing IRAS 07299−1651, a system containing two massive protostars, starsstillgrowingbypullinginsur- rounding gas and dust. The team had studied this system before, in 2019,whenALMAobservationsfirst provided direct dynamical con- straintsonthepair.Atthetime,the results seemed broadly consistent with the standard picture: two stars forming together from the frag- mentation of one large disk. But one detail didn’t quite fit: the disks around the two stars already looked oddly misaligned. Todigdeeper,theresearchersspent nearlyeightyearsmeasuringex- tremelysubtleshiftsinthetwostars’ positionsonthesky,atechniquethat requires exceptional precision and is wellwithinALMA’scapabilities.“For thefirsttime,wewereabletowatch two massive stars move around one another while they were still being born,”saidYichenZhang,correspon- ding author of the study. The team combined this long-term ALMAmonitoringwithdatafrom ﻣﺠﻠﺔ FreeAstronomy ﺎﻟﻌﺮ ﺔ 47 اﻟﻠﺤﻈﺔ اﻟﻔﻌﻠﻴﺔ اﻟﺘﻲ ﻳﺘﻜـﻮّن ﻓﻴﻬـﺎ اﻟﻨﻈـﺎم وﺳﻌﻰ ﻓﺮﻳﻖ دوﱄ ﺑﻘﻴﺎدة ﻳﻴﺸﻦ ﺗﺸﺎﻧﻎ ﻣـﻦ ﺟﺎﻣﻌﺔ ﺷﻨﻐﻬﺎي ﺟﻴﺎو ﺗﻮﻧﻎ إﱃ ﺗﻐﻴـ ذﻟـﻚ ﻋـﱪ دراﺳـﺔ اﻟﻨﻈـﺎم IRAS 07299−1651 ا ﻟﺬي ﻳﻀﻢ ﻧﺠﻤ أوﻟﻴ ﺿﺨﻤ أي ﻧﺠﻤ ﻻ ﻳﺰاﻻن ﰲ ﻃـﻮر اﻟﻨﻤـﻮ ﻋـﱪ ﺟـﺬب اﻟﻐـﺎز واﻟﻐﺒﺎر ا ﺤﻴﻄ ﺑﻬﻤﺎ وﻛﺎ ن اﻟﻔﺮﻳﻖ ﻗﺪ درس ﻫـﺬا اﻟﻨﻈـﺎم ﺳـﺎﺑﻘ ﺎً ﰲ ﻋـﺎم 2019 ﻋﻨـﺪﻣﺎ أﺗﺎﺣـﺖ أرﺻـﺎد أ ـﺎ " " ﻟﻠﻤــﺮة اﻷ وﱃ ﻗﻴــﻮد اً ـــــــــــــــــــــــــــــــــــــ دﻳﻨﺎﻣﻴﻜﻴﺔ ﻣﺒﺎﴍة ﻋﲆ ﺣﺮﻛـﺔ اﻟﻨﺠﻤـ وﰲ ذﻟﻚ اﻟﻮﻗﺖ ﺑﺪت اﻟﻨﺘﺎﺋﺞ ﻣﺘﻮاﻓﻘﺔ إﱃ ﺣﺪ ﻛﺒ ﻣﻊ اﻟﺘﺼﻮر اﻟﺘﻘﻠﻴ ﺪي اﻟﺬي ﻳﻔـﱰض ﺗﺸـﻜّﻞ اﻟﻨﺠﻤ ﻣﻌ ﺎً ﻧﺘﻴﺠﺔ ﺗﻔﺘﺖ ﻗﺮصﺿﺨﻢ واﺣﺪ ﻟﻜﻦ ﺗﻔﺼﻴﻼً اً واﺣﺪ ﻟﻢ ﻳﻜﻦ ﻣﺘﻮاﻓﻘـ ﺎً ﺎً ﺗﻤﺎﻣـ ﻣﻊ ﻫﺬا اﻟﺘﺼﻮر ﻓﻘﺪ ﺑﺪت اﻷﻗﺮاص ا ﺤﻴﻄـﺔ ﺑـﺎﻟﻨﺠﻤ ﻏـ ﻣﱰاﺻـﻔﺔ ﺑﺼـﻮرة ﻻﻓﺘ ـﺔ وﻟﻠﺘﻌﻤﻖ ﰲ ﻓﻬﻢ اﻟﻨﻈﺎم أﻣﴣ اﻟﺒﺎﺣﺜﻮن ﻧﺤﻮ ﺛﻤﺎﻧﻲ ﺳـﻨﻮات ﰲ ﻗﻴـﺎس اﻟﺘﻐـ ات اﻟﺒﺎﻟﻐـﺔ ـــــــــــــــــــــــــــــــــــــ اﻟﺪﻗﺔ ﰲ ﻣﻮﺿﻌﻲ اﻟﻨﺠﻤ ﻋﲆ اﻟﺴﻤﺎء، وﻫﻲ ﺗ ﻘﻨﻴﺔ ﺗﺘﻄﻠﺐ ﻣﺴﺘﻮى اﺳﺘﺜﻨﺎﺋﻴ ﺎً ﻣـﻦ اﻟﺪﻗـﺔ وﺗﻌﺪ ﺿﻤﻦ اﻟﻘﺪرات اﻟﺘﻲ ﻳ ﻮﻓﺮﻫﺎ ﻣﺮﺻﺪ أ ﺎ . ﻗـﺎل ﻳﻴﺸـﻦ ﺗﺸـﺎﻧﻎ ا ﺆﻟـﻒ ا ﺴـﺆول ﻋـﻦ اﻟﺪراﺳﺔ ﻟﻠﻤﺮة »: اﻷوﱃ ﺗﻤﻜّﻨﺎ ﻣـﻦ ﻣﺸـﺎﻫﺪة ﻧﺠﻤ ﺿ ﺨﻤ وﻫﻤﺎ ﻳﺪوران ﺣﻮل ﺑﻌﻀﻬﻤﺎ ﺑﻌﻀﺎ ﺑﻴﻨﻤﺎ ﻛﺎﻧﺎ ﻻ ﻳﺰاﻻن ﰲ ﻃﻮر اﻟﺘﺸـﻜّﻞ « وﺟﻤﻊ اﻟﻔﺮﻳﻖ ﻫـﺬه ا ﺮاﻗﺒـﺔ ﻃﻮﻳﻠـ ﺔ اﻷﻣـﺪ ﺑﻮاﺳﻄﺔ ﻣﺮﺻﺪ أ ﺎ ﻣﻊ ﺑﻴﺎﻧﺎت ﻣﻦ ا ﺼﻔﻮﻓﺔ ـــــــــــــــــــــــــــــــــــــ ﻧﻮﻓﻤﺒﺮ - ﺩﻳﺴﻤﺒﺮ 2 0 2 6 رﺳـــــــﻢ ﺗﺨ ﻠــــــــﻲ ﻟﺘﺸــــــــ ﻞ ﻧﻈــــــــﺎم ﺛﻨــــــــﺎﺋﻲﺿــــــــ ﻢ وﻣﺘﻘــــــﺎر ﻈﻬــــــﺮ أﻗﺮاﺻــــــﺎً ﻏــــــ ﻣ اﺻــــــﻔﺔ ﺣـــــــﻮل ﻧﺎﺷﺌ ﻧ ﻤ . [Y. Zhang]