The Absolute Magnitude Of RR Lyrae Stars

T. Tsujimoto, M. Miyamoto, Y. Yoshii
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Abstract

The present determination of the absolute magnitude .M v (RR) of RR Lyrae stars is twofold, relying upon Hipparcos proper motions and trigonometric parallaxes separately. First, applying the statistical parallax method to the proper motions, we find v (RR)>= 0.69 ± 0.10 for 99 halo RR Lyraes with = -1.58. Second, applying the Lutz-Kelker correction to the RR Lyrae HIP95497 with the most accurately measured parallax, we obtain M v (RR) = 0.57-0.74 at [Fe/H]=-1.6. Furthermore, allowing full use of low accuracy and negative parallaxes as well for 125 RR Lyraes with - 2.49≤[Fe/H]≤0.07, the maximum likelihood estimation yields the relation, M v (RR)= (0.59±0.37)+(0.20±0.63)([Fe/H]+1.60), which formally agrees with the recent preferred relation. The same estimation yields again My (RR) = 0.65 ± 0.33 for the 99 halo RR Lyraes. Although the formal errors in the latter two estimates are rather large, all of the four results suggest the fainter absolute magnitude, My(RR)=0.6-0.7 at [Fe/H]=-1.6. The present results still provide the lower limit on the age of the universe which is inconsistent with a fiat, matter-dominated universe and current estimates of the Hubble constant.
天琴座RR星的绝对星等
目前对天琴座RR星的绝对星等m.v (RR)的测定是双重的,分别依靠依巴谷固有运动和三角视差。首先,将统计视差方法应用于固有运动,我们发现99晕RR Lyraes的v (RR)>= 0.69±0.10,= -1.58。其次,对视差测量精度最高的RR Lyrae HIP95497进行Lutz-Kelker校正,得到[Fe/H]=-1.6时的M v (RR) = 0.57-0.74。此外,在充分考虑低精度和负视差的情况下,对于- 2.49≤[Fe/H]≤0.07的125 RR Lyraes,最大似然估计得到的关系为M v (RR)=(0.59±0.37)+(0.20±0.63)([Fe/H]+1.60),与最近的优选关系正式一致。同样的估计也得出了99晕天琴座RR的My (RR) = 0.65±0.33。虽然后两种估计的形式误差相当大,但所有四种结果都表明绝对星等较弱,在[Fe/H]=-1.6时,My(RR)=0.6-0.7。目前的结果仍然提供了宇宙年龄的下限,这与固定的、物质主导的宇宙和目前对哈勃常数的估计不一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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