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فضانوردان - کوتوله ی سفید، در آستانه ی ابر نواختری!

فضانوردان

همه چیز در مورد نجوم

جمعه 20 شهریور 1388

کوتوله ی سفید، در آستانه ی ابر نواختری!

نویسنده: پرتو   طبقه بندی: اخبار، 

ماهواره ی فضایی  اروپایی XMM Newton توانست اولین تصاویر را از ستاره ی کوتوله ی سفیدی که می رود در آینده ی نزدیک چند میلیون سال تبدیل به یک ابر نواختر شود تهیه کرد. این زمان در مقیاس نجومی بسیار کوچک می باشد.
این کوتوله ی سفید که به دور ستاره ی همدمش HD 49798 می چرخد بسیار دورتر از آن است که بتواند برای زمینیان خطر داشته باشد، ولی در عین حال آنقدر نزدیک می باشد که برای زمینیان در چند میلیون سال آینده نمایش قشنگی را به اجرا در بیاورد. انتظار می رود که در آن موقع این ابر نواختر همانند ماه کامل بدرخشد و به راحتی در نور روز بتوان آن را مشاهده کرد. این ستاره ی کوتوله ی سفید دارای 1.2 جرم خورشید می باشد و قطر آن نصف قطر زمین است. این ستاره در هر 13 ثانیه یک دور به گرد خود می چرخد و یکی از سریع ترین کوتوله های سفید می باشد.



منبع : سایت آسمان شب

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