Progress on a model for β Lyrae
Progress on a model for β Lyrae
复制标题
天琴座β模型的进展
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Linnell
中科院分区：
文献类型：
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作者：
A. Linnell
一般认为，β天琴座是一个大质量的质量转移系统，其中质量较大的增益体嵌入厚的吸积盘中。没有详细的，定量的吸积盘模型的系统，适合现有的光度和光谱数据，已公布。
本文考虑一个厚吸积盘模型。吸积盘边缘的经验双温度模型产生了一个准确的拟合UBV和OAO2测光。双温度边缘模型导致合成光谱具有比分光光度扫描中存在的大得多的巴耳末跳跃。同样的模型无法产生0.5p食深于0.0p食的红外光变曲线，如詹姆森和朗莫尔的观测所示。
本文接下来报告了一个模型的初步结果，在这个模型中，一个额外的连续辐射源来自增益器辐射的汤姆逊散射，这是由厚吸积盘隐藏在观察者之外。
所采用的传质速率不能提供吸积盘边缘辐射的能量，任何可信的更大速率也不能。最有可能的能量来源是质量增益。
It is generally accepted that β Lyrae is a massive mass-transfer system in which the more massive gainer is embedded in a thick accretion disc. No detailed, quantitative accretion disc model of the system, which fits both the available photometric and spectroscopic data, has been published.
This paper considers a thick accretion disc model. An empirical two-temperature model for the accretion disc rim produces an accurate fit to the UBV and OAO2 photometry. The two-temperature rim model leads to synthetic spectra with a much larger Balmer jump than is present in spectrophotometric scans. The same model fails to produce IR light curves with the 0.5p eclipse deeper than the 0.0p eclipse, as shown in the observations of Jameson & Longmore.
The paper next reports initial results for a model in which an extra source of continuum radiation arises from Thomson scattering of radiation from the gainer, which is hidden from the observer by the thick accretion disc.
The adopted rate of mass transfer cannot supply the energy radiated by the accretion disc rim, nor can any credible larger rate. The most likely energy source is the mass gainer.