Properties of the SN 1987A Circumstellar Ring and the Distance to the Large Magellanic Cloud
Properties of the SN 1987A Circumstellar Ring and the Distance to the Large Magellanic Cloud
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SN 1987A 星周环的特性和到大麦哲伦星云的距离
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
R. Kirshner
中科院分区：
文献类型：
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作者：
N. Panagia;R. Gilmozzi;F. Macchetto;H. Adorf;R. Kirshner
与SN 1987 A的距离是通过比较它的拱星环的角度大小来确定的，它的拱星环的角度大小是从一个窄的禁止O III 5007 A过滤器获得的HST图像中测量的，其绝对大小是从IUE测量的窄紫外线的光变曲线分析中得出的。分析证实，观察到的椭圆形结构是一个圆环，平均倾角为i = 42.8 +或-2.6度，并确定其绝对直径为（1.27 +或-0.07）× 10-18 cm。它与角直径的比值为1.66 +或-0.03弧秒，可以精确地确定到SN 1987 A的距离，即，d（1987 A）= 51.2 +或- 3.1千秒差距。
The distance to SN 1987A was determined by comparing the angular size of its circumstellar ring, measured from an HST image obtained in a narrow forbidden O III 5007 A filter, with its absolute size derived from an analysis of the light curves of narrow UV lines measured with the IUE. The analysis confirms that the observed elliptical structure is a circular ring seen at a mean inclination of i = 42.8 + or - 2.6 deg and provides a determination of its absolute diameter of (1.27 + or - 0.07) x 10 to the 18th cm. Its ratio to the angular diameter of 1.66 + or - 0.03 arcsec gives an accurate determination of the distance to SN 1987A, i.e., d(1987A) = 51.2 + or - 3.1 kpc.