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arXiv 1010.3790astro-ph.SR
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天狼星A的角直径和基本参数

The Angular Diameter and Fundamental Parameters of Sirius A

J. Davis, M. J. Ireland, J. R. North, J. G. Robertson, W. J. Tango, P. G. Tuthill

摘要:

悉尼大学的恒星干涉仪(SUSI)已被用于对天狼星A的角直径进行新的测定。观测是在694.1 nm的有效波长下进行的,并且边缘变暗的角直径的新值为6.048 +/- 0.040mas(+/-0.66%)。这一新的结果与以前的测量结果进行了比较,发现与欧洲南方天文台的超大望远镜干涉仪(VLTI)在2.176微米处进行的常规校准测量非常一致(但不是第二次全球校准VLTI测量)。SUSI和第一次VLTI结果的加权平均值给出天狼星A的边缘变暗角直径为6.041 +/- 0.017mas(+/-0.28%)。结合依巴谷视差,半径等于1.713 +/- 0.009R_sun。热辐射通量是根据已发表的光度学和分光光度学确定的,结合角直径,得出恒星表面的出射通量为(5.32+/- 0.14)x10^8 Wm^-2,有效温度为9845 +/- 64 K。光度为24.7 +/- 0.7 L_sun。

英文摘要:

The Sydney University Stellar Interferometer (SUSI) has been used to make a new determination of the angular diameter of Sirius A. The observations were made at an effective wavelength of 694.1 nm and the new value for the limb-darkened angular diameter is 6.048 +/- 0.040mas (+/-0.66%). This new result is compared with previous measurements and is found to be in excellent agreement with a conventionally calibrated measurement made with the European Southern Observatory's Very Large Telescope Interferometer (VLTI) at 2.176 microns (but not with a second globally calibrated VLTI measurement). A weighted mean of the SUSI and first VLTI results gives the limb-darkened angular diameter of Sirius A as 6.041 +/- 0.017mas (+/-0.28%). Combination with the Hipparcos parallax gives the radius equal to 1.713 +/- 0.009R_sun. The bolometric flux has been determined from published photometry and spectrophotometry and, combined with the angular diameter, yields the emergent flux at the stellar surface equal to (5.32+/- 0.14)x10^8 Wm^-2 and the effective temperature equal to 9845 +/- 64 K. The luminosity is 24.7 +/- 0.7 L_sun.

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