PRECISE ESTIMATES OF THE SYNTHETIC SPECTRAL DISTANCES TO DA WHITE DWARFS
PRECISE ESTIMATES OF THE SYNTHETIC SPECTRAL DISTANCES TO DA WHITE DWARFS
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DOI：
10.1088/0004-6256/135/4/1239
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
J. Holberg;Pierre Bergeron;A. Gianninas
中科院分区：
文献类型：
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作者：
J. Holberg;Pierre Bergeron;A. Gianninas
利用最近的光度校准，我们使用基于光谱温度和重力的多波段合成光度测量，大大改进了 DA 白矮星的距离估计。我们基于光谱的光度距离估计与三角视差得出的距离估计之间存在非常好的相关性。我们调查了距离估计中涉及的不确定性，并讨论了此类技术最有可能失败的情况。我们将我们的技术应用于斯隆数字巡天 DA 白矮星的大样本，其中 H i Balmer 剖面的自动拟合产生了光谱温度和重力。我们根据已发表的狭缝光谱学对这些温度和重力进行了简单的经验修正。在应用这些 Teff-log g 校正以及适当的星际消光校正后，如有必要，我们从该样本中推导出 7062 颗 DA 恒星的基于光谱的光度距离。
Using recent photometric calibrations, we develop greatly improved distance estimates for DA white dwarfs using multi-band synthetic photometry based on spectroscopic temperatures and gravities. Very good correlations are shown to exist between our spectroscopically based photometric distance estimates and those derived from trigonometric parallaxes. We investigate the uncertainties involved in our distance estimates, as well as discuss the circumstances where such techniques are most likely to fail. We apply our techniques to the large sample of Sloan Digital Sky Survey DA white dwarfs where automated fitting of H i Balmer profiles yields spectrometric temperatures and gravities. We determine simple empirical corrections to these temperatures and gravities with respect to published slit spectroscopy. After applying these Teff–log g corrections as well as appropriate interstellar extinction corrections, where necessary, we derive spectroscopically based photometric distances for 7062 DA stars from this sample.