基于谱线检测的发射线星自动识别方法

针对我国即将建成的大型巡天项目(LAMOST),给出了一种基于谱线检测的发射线星自动识别方法.主要步骤:1)通过获取谱线特征匹配值进行恒星谱线整体估计;2)利用提取出的恒星谱线特征检测恒星的巴耳末(Balmer)线;3)对获取的特征匹配值采用阈值法,并结合恒星Balmer线的检测结果,进行发射线里判别.通过对SDSS DR4所有光谱进行识别,共获得了242条具有恒星发射线的特殊天体.根据星表查询结果,这些天体包括发射线星、激变变星和一些未知特殊天体等.大量真实光谱数据实验表明,本文方法可有效识别发射线星.

A Method for Automatic Recognition of Emission-Line Stars Based on Detection of Spectral Lines

Aiming at the LAMOST project, the largest sky survey project implemented in China, a novel method for automatic recognition of emission-line stars (ELS) based on detection of spectral lines is proposed. This method consists of three main steps: 1) the integral information of spectral lines is calculated by obtaining the correlations of the features of spectral lines; 2) the stellar Balmer lines are detected based on the features of stellar spectral lines; 3) the ELSs are automatically recognized by using the threshold of the correlations and the results of the stellar Balmer lines. In the experiments with all observed spectra from the sloan digital sky survey (SDSS) DR4, 242 peculiar celestial bodies with the stellar emission lines are obtained. According to the Simbad reference database, they are the celestial bodies include ELSs, cataclysmic variable stars (CVS), and unknown peculiar celestial bodies, etc.. The extensive experiments with observed spectra show that the proposed method can automatically recognize ELS effectively.