کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10723628 | 1033878 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Recalibration of the parameters of EXO 0748-676 and antikaon condensation in neutron star
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Recalibration of the parameters of EXO 0748-676 and antikaon condensation in neutron star Recalibration of the parameters of EXO 0748-676 and antikaon condensation in neutron star](/preview/png/10723628.png)
چکیده انگلیسی
We reanalyze the observation data of X-ray burst of the X-ray binary EXO 0748-676 with the maximum measurement errors for the originally assigned redshift z=0.35 and the latter modified z=0.24. The newly obtained properties of the star are M⩾1.91â0.33+0.40Mâ and R⩾12.47â2.15+2.64 km for z=0.35, slightly different from the previous result, and M⩾1.48â0.26+0.31Mâ and R⩾12.47â2.15+2.63 km for z=0.24. The neutron star mass obtained with z=0.24 is more consistent with the result M=1.35Mâ given by a detailed multiwavelength analysis. With this result, it is insufficient to rule out soft equations of state of nuclear matter, including those with the appearance of exotic matter. Furthermore, as an example, we show that the exotic composition of the matter in neutron star including antikaon condensation and hyperons can yield an maximum mass about M=1.66Mâ. This is consistent with the mass of EXO 0748-676 with uncertainty in 1Ï.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 682, Issue 2, 30 November 2009, Pages 171-176
Journal: Physics Letters B - Volume 682, Issue 2, 30 November 2009, Pages 171-176
نویسندگان
Guo-yun Shao, Yu-xin Liu,