MACHO LMC数据库中第一泛音RR Lyrics变量的距离：一种校正拥挤效应的新方法
The Distance of the First Overtone RR Lyrae Variables in the MACHO LMC Database: A New Method to Correct for the Effects of Crowding
摘要：
先前的研究表明，大麦哲伦星云中的许多RR型天琴座变星具有与银河系球状星团M3中的变星相似的性质。假设M3 RR Lyonian变量遵循与LMC对应物相同的周期、温度、振幅和傅立叶相位参数φ 31之间的关系，我们使用M3 φ 31-logP关系识别了LMC棒附近16个场中的M3类未演化的第一泛音RR Lyonian变量。这些变星的温度是根据M3 logP-logTe关系计算出来的，这样就可以分别计算出每颗恒星的消光。由于混合星在给定的周期内具有较低的振幅，因此周期振幅关系应该是识别哪些恒星受到拥挤影响的有用工具。我们发现，低振幅星更亮。我们将它们从样本中移除，并导出LMC距离模量18.49+/-0.11。
英文摘要：
Previous studies have indicated that many of the RR Lyrae variables in the LMC have properties similar to the ones in the Galactic globular cluster M3. Assuming that the M3 RR Lyrae variables follow the same relationships among period, temperature, amplitude and Fourier phase parameter phi31 as their LMC counterparts, we have used the M3 phi31-logP relation to identify the M3-like unevolved first overtone RR Lyrae variables in 16 fields near the LMC bar. The temperatures of these variables were calculated from the M3 logP-logTe relation so that the extinction could be derived for each star separately. Since blended stars have lower amplitudes for a given period, the period amplitude relation should be a useful tool for identifying which stars are affected by crowding. We find that the low amplitude stars are brighter. We remove them from the sample and derive an LMC distance modulus 18.49+/-0.11.
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