首页> 外文OA文献 >The RR Lyrae Period-Luminosity-(Pseudo-)Color and Period-Color-(Pseudo-)Color Relations in the Str'omgren Photometric System: Theoretical Calibration
【2h】

The RR Lyrae Period-Luminosity-(Pseudo-)Color and Period-Color-(Pseudo-)Color Relations in the Str'omgren Photometric System: Theoretical Calibration

机译:RR Lyrae period-Luminosity-(pseudo-)颜色和   str \“omgren光度测量系统中的周期 - 颜色 - (伪)颜色关系:   理论校准

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

We present a theoretical calibration of the RR Lyrae period-luminosity-colorand period-color-color relations in the multiband uvby Stroemgren photometricsystem. Our theoretical work is based on calculations of synthetic horizontalbranches (HBs) for four different metallicities, fully taking into accountevolutionary effects for a wide range in metallicities and HB morphologies.While our results show that "pure" period-luminosity and period-color relationsdo not exist in the Stroemgren system, which is due to the large scatter thatis brought about by evolutionary effects when the uvby bandpasses are used,they also reveal that such scatter can be almost completely taken into accountby incorporating Stroemgren pseudo-color [C_0 = (u-v)_0 - (v-b)_0] terms intothose equations, thus leading to tight period-luminosity-{\em pseudo}-color(PLpsC) and period-color-{\em pseudo}-color (PCpsC) relations. We provide thelatter in the form of analytical fits, so that they can be applied with highprecision even in the case of field stars. In view of the very smallsensitivity of C_0 to interstellar reddening, our PLpsC and PCpsC relationsshould be especially useful for the derivation of high-precision distance andreddening values. In this sense, we carry out a first application of ourrelations to field RR Lyrae stars, finding evidence that the stars RR Lyr, SUDra, and SS Leo -- but not SV Hya -- are somewhat overluminous (by amountsranging from ~0.05 to 0.20 mag in y, and thus V) with respect to the averagefor other RR Lyrae stars of similar metallicity.
机译:我们提出了多波段uvby Stroemgren光度系统中RR Lyrae周期-发光度-颜色和周期-颜色-颜色关系的理论校准。我们的理论工作是基于四种不同金属的合成水平支化(HBs)的计算,充分考虑了各种金属和HB形态的演化效应。尽管我们的结果表明,“纯”的周期发光度和周期的颜色关系没有存在于Stroemgren系统中,这是由于使用uvby带通时由进化效应带来的大散射所致,它们还揭示了通过合并Stroemgren伪色[C_0 =(uv)可以几乎完全考虑到这种散射_0-(vb)_0]项进入这些方程式,从而导致紧密的周期发光度-{伪伪色}-颜色(PLpsC)和周期-颜色伪伪-颜色(PCpsC)关系。我们以解析拟合的形式提供后者,以便即使在场星的情况下也可以高精度地应用它们。鉴于C_0对星际变红的敏感性非常小,我们的PLpsC和PCpsC关系对于推导高精度距离和变红值特别有用。从这个意义上讲,我们首次将我们的关系应用于外地RR Lyrae恒星,发现证据表明RR Lyr,SUDra和SS Leo恒星(而非SV Hya)有点发光(量介于〜0.05至0.20之间)相对于其他金属相似的RR天琴星的平均值,y上的mag,因此V)。

著录项

  • 作者

    Cortés, C.; Catelan, M.;

  • 作者单位
  • 年度 2008
  • 总页数
  • 原文格式 PDF
  • 正文语种
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号