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arXiv 0912.3903astro-ph.SR
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新型sdBV CS 1246的光度测定和光谱分析

Photometry and spectroscopy of the new sdBV CS 1246

B. N. Barlow, B. H. Dunlap, J. C. Clemens, A. E. Lynas-Gray, K. M. Ivarsen, A. P. LaCluyze, D. E. Reichart, J. B. Haislip, M. C. Nysewander

摘要:

我们报告发现的大振幅振荡的热亚矮星B星CS 1246和目前的多色测光和时间分辨光谱支持这一发现。2009年4月,我们使用0.41-m PROMPT阵列在u ',g',r '和i'滤波器中连续3个晚上同时采集数据。这些数据揭示了周期为371.707 +/-0.002s且振幅取决于波长的单一振荡模式,在u'滤波器中的值为34.5 +/-1.6mma。我们没有在任何光变曲线中检测到额外的频率。随后,我们使用4.1米SOAR望远镜获得了一个时间序列的248个低分辨率光谱跨度6小时,寻找线轮廓的变化。模型拟合的光谱给出的平均大气值Teff = 28450 +/- 700 K和log g = 5.46 +/- 0.11经历变化的半振幅为507 +/- 55 K和0.034 +/- 0.009 dex,分别。我们还检测到径向速度振荡,振幅为8.8 +/- 1.1 km/s。角度和物理半径变化之间的关系表明,振荡是一致的径向模式。在径向脉动的假设下,我们使用Baade-Wesselink方法计算恒星的距离、半径和质量分别为d = 460 +/- 140 pc,R = 0.19 +/- 0.08 Rsun,M = 0.39 +/- 0.22 Msun。

英文摘要:

We report the discovery of a large-amplitude oscillation in the hot subdwarf B star CS 1246 and present multi-colour photometry and time-resolved spectroscopy supporting this discovery. We used the 0.41-m PROMPT array to acquire data in the u', g', r', and i' filters simultaneously over 3 consecutive nights in 2009 April. These data reveal a single oscillation mode with a period of 371.707 +/- 0.002 s and an amplitude dependent upon wavelength, with a value of 34.5 +/- 1.6 mma in the u' filter. We detected no additional frequencies in any of the light curves. Subsequently, we used the 4.1-m SOAR telescope to acquire a time-series of 248 low-resolution spectra spanning 6 hrs to look for line profile variations. Models fits to the spectra give mean atmospheric values of Teff = 28450 +/- 700 K and log g = 5.46 +/- 0.11 undergoing variations with semi-amplitudes of 507 +/- 55 K and 0.034 +/- 0.009 dex, respectively. We also detect a radial velocity oscillation with an amplitude of 8.8 +/- 1.1 km/s. The relationship between the angular and physical radii variations shows the oscillation is consistent with a radial mode. Under the assumption of a radial pulsation, we compute the stellar distance, radius, and mass as d = 460 +/- 140 pc, R = 0.19 +/- 0.08 Rsun, and M = 0.39 +/- 0.22 Msun, respectively, using the Baade-Wesselink method.

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