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arXiv 0712.0776astro-ph
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根据单历元光度和光谱观测识别SDSS中的RR Lyrant变星

Identification of RR Lyrae Variables in SDSS from Single-Epoch Photometric and Spectroscopic Observations

Ronald Wilhelm, W. Lee Powell, Timothy C. Beers, Branimir Sesar, Carlos Alende Prieto, Kenneth W. Carrell, Young Sun Lee, Brian Yanny, Constance M. Rockosi, Nat… 展开作者

Ronald Wilhelm, W. Lee Powell, Timothy C. Beers, Branimir Sesar, Carlos Alende Prieto, Kenneth W. Carrell, Young Sun Lee, Brian Yanny, Constance M. Rockosi, Nathan De Lee, Gwen Hansford Armstrong, Stephen J. Torrence

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59 pages, 17 figures, 8 tables
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摘要：

我们描述了一个新的RR Lyrant识别技术的基础上，在SDSS数据发布6（DR-6）的相位单历元光度和光谱观测。该技术通过利用当在随机阶段进行两次观测时g-r颜色和氢巴耳末线强度之间的大差异来检测可变性。与SDSS赤道条纹（条纹82）中已知变量的大样本比较表明，我们的技术的发现效率约为85%。对具有多个光谱观测的恒星的分析表明，在整个DR-6样本中具有类似的效率。我们还开发了一种技术来估计的平均g视星等（在脉动周期）为个别RR天琴座恒星，使用<g-r>的整个样本和测量的颜色为每个明星。由此产生的距离被发现具有约14%的精度。最后，我们探索我们的DR-6样本N = 1087变量的属性，并恢复部分人马座北流和南流。对南流的距离和速度的分析与先前发表的蓝色水平分支恒星的数据一致。在北银河系极地帽附近的一个样本中，我们发现了下降的北旋臂的证据，并可能检测到拖曳臂。

英文摘要：

We describe a new RR Lyrae identification technique based on out-of-phase single-epoch photometric and spectroscopic observations contained in SDSS Data Release 6 (DR-6). This technique detects variability by exploiting the large disparity between the g-r color and the strength of the hydrogen Balmer lines when the two observations are made at random phases. Comparison with a large sample of known variables in the SDSS equatorial stripe (Stripe 82) shows that the discovery efficiency for our technique is ~85%. Analysis of stars with multiple spectroscopic observations suggests a similar efficiency throughout the entire DR-6 sample. We also develop a technique to estimate the average g apparent magnitude (over the pulsation cycle) for individual RR Lyrae stars, using the <g-r> for the entire sample and measured colors for each star. The resulting distances are found to have precisions of ~14%. Finally, we explore the properties of our DR-6 sample of N = 1087 variables, and recover portions of the Sagittarius Northern and Southern Stream. Analysis of the distance and velocity for the Southern Stream are consistent with previously published data for blue horizontal-branch stars. In a sample near the North Galactic Polar Cap, we find evidence for the descending leading Northern arm, and a possible detection of the trailing arm.

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