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首页> 外文期刊>The Astrophysical journal >A QUANTITATIVE ANALYSIS OF THE AVAILABLE MULTICOLOR PHOTOMETRY FOR RAPIDLY PULSATING HOT B SUBDWARFS
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A QUANTITATIVE ANALYSIS OF THE AVAILABLE MULTICOLOR PHOTOMETRY FOR RAPIDLY PULSATING HOT B SUBDWARFS

机译：快速脉冲热B子波可用多色光度法的定量分析

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摘要

We present a quantitative and homogeneous analysis of the broadband multicolor photometric data sets gathered so far on rapidly pulsating hot B subdwarf stars. This concerns seven distinct data sets related to six different stars. Our analysis is carried out within the theoretical framework developed by Randall et al., which includes full nonadiabatic effects. The goal of this analysis is partial mode identification, i.e., the determination of the degree index l of each of the observed pulsation modes. We assume possible values of l from 0 to 5 in our calculations. For each target star, we compute a specific model atmosphere and a specific pulsation model using estimates of the atmospheric parameters coming from time-averaged optical spectroscopy. For every assumed value of l, we use a formal χ~2 approach to model the observed amplitude-wavelength distribution of each mode, and we compute a quality of fit Q probability to quantify the derived fit and to discriminate objectively between the various solutions. We find that no completely convincing and unambiguous l identification is possible on the basis of the available data, although partial mode discrimination has been reached for 25 out of the 41 modes studied. A brief statistical study of these results suggests that a majority of the modes must have l-values of 0, 1, and 2, but also that modes with l = 4 could very well be present, while modes with l = 3 appear to be rarer. This is in line with recent results showing that l = 4 modes in rapidly pulsating B subdwarfs have a higher visibility in the optical domain than modes with l = 3. Although somewhat disappointing in terms of mode discrimination, our results still suggest that the full potential of multicolor photometry for l identification in pulsating subdwarfs is within reach. It will be a matter of gathering higher S/N ratio observations than has been done up to now.
机译：我们目前对快速脉冲热B亚矮星上收集的宽带多色光度数据集进行定量和均质分析。这涉及与六个不同恒星相关的七个不同数据集。我们的分析是在Randall等人开发的理论框架内进行的，其中包括完全非绝热效应。该分析的目的是部分模式识别，即，确定每个观察到的脉动模式的度数指数l。我们在计算中假设l的可能值从0到5。对于每个目标恒星，我们使用来自时间平均光谱的大气参数估计值来计算特定的模型大气和特定的脉动模型。对于l的每个假定值，我们使用形式化的χ〜2方法对观察到的每个模式的振幅-波长分布进行建模，并计算拟合质量Q概率来量化导出的拟合并客观地区分各种解决方案。我们发现，尽管已有41种模式中的25种已经达到部分模式辨别，但根据现有数据不可能完全令人信服和明确地识别l。对这些结果的简要统计研究表明，大多数模式必须具有0、1和2的l值，而且l = 4的模式很可能存在，而l = 3的模式似乎是稀有。这与最近的结果一致，即在快速脉动的B个矮星中，l = 4个模态比l = 3的模态在光域具有更高的可见性。尽管在模式辨别方面有些令人失望，但我们的结果仍然表明，全部潜力多色光度法在脉动矮小中进行鉴定的方法已可实现。收集信噪比的观测值要比到目前为止高。

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