标题： 2009年LMC脉冲星B0540-69的光学光变曲线 显示英文标题

标题： The optical light curve of the LMC pulsar B0540-69 in 2009

摘要： 本文报告了对可见波段第二亮脉冲星 PSR B0540-69 的光学光变曲线的详细分析，该数据于 2009 年（1 月 18 日和 20 日，以及 12 月 14 日、15 日、16 日和 18 日）使用安装在智利拉西拉欧洲南方天文台（ESO）3.6 米新技术望远镜（NTT）上的高时间分辨率光子计数测光仪 Iqueye 获得。 Iqueye 得到的光学光变曲线显示主峰具有双峰结构，且上升边比下降边更陡峭。 双峰可以用两个高度相同、FWHM 分别为 13.3 毫秒和 15.5 毫秒的高斯函数来拟合。 我们新的自旋频率值允许将可靠估计频率一阶导数和二阶导数的时间间隔延长了 3.5 年。 讨论了这一结果对脉冲星的制动指数和年龄的影响。 得出从 1987 年到 2009 年整体制动指数 n = 2.087 ± 0.007。 校正后的制动年龄确认约为 1700 年。 显示英文摘要

摘要： This paper reports a detailed analysis of the optical light curve of PSR B0540-69, the second brightest pulsar in the visible band, obtained in 2009 (Jan. 18 and 20, and Dec. 14, 15, 16, 18) with the very high speed photon counting photometer Iqueye mounted at the ESO 3.6-m NTT in La Silla (Chile). The optical light curve derived by Iqueye shows a double structure in the main peak, with a raising edge steeper than the trailing edge. The double peak can be fitted by two Gaussians with the same height and FWHM of 13.3 and 15.5 ms respectively. Our new values of spin frequencies allow to extend by 3.5 years the time interval over which a reliable estimate of frequency first and second derivatives can be performed. A discussion of implications on the braking index and age of the pulsar is carried out. A value of n = 2.087 +/- 0.007 for the overall braking index from 1987 to 2009 is derived. The braking index corrected age is confirmed around 1700 years.