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PG 2l3l+066: A TEST OF PRE--WHITE DWARF ASTEROSEISMOLOGY

机译:PG 2l3l + 066:预先进行白矮星星形地震学的测试

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PG 2131 +066 is a composite-spectrum binary with a hot pulsating PG 1159-type pre--white dwarf and an early M-type main-sequence star. Analysis of Whole Earth Telescope observations of the pulsat- ing pre--white dwarf component provided an asteroseismological determination of its mass, luminosity, and effective temperature. These determinations allowed Kawaler et al. to determine the distance to this star. In this paper, we refine the asteroseismological distance determination and confirm the distance by an independent measurement to the system via the spectroscopic parallax of the M star. PG 213l +066 was observed by the HST using the original Planetary Camera in 1993 September. Exposures with filters F785LP and F555W both showed the companion at a distance of 0"3. Photometry of the images pro- vides an apparent magnitude for the main sequence companion of m_v = 18.97 ± 0.15, from which we find a distance of 560~+200_-134 pc. We also recalculated the asteroseismological distance to the pre--white dwarf using updated models and new spectroscopic constraints from UV spectra. The new seismological dis- tance is 668~+78_-83 pc, in satisfactory agreement with the distance of the secondary star. These results suggest that this is indeed a physical binary and that the seismological distance determination technique may be the best way to determine the distance to the pulsating hot preuswhite dwarf stars.
机译:PG 2131 +066是一个复合光谱双星,具有一个热脉动的PG 1159型预白矮星和一个早期M型主序星。对全地球望远镜观测到的脉冲前白矮星成分的分析提供了其质量,光度和有效温度的星震学测定。这些确定允许Kawaler等人。确定到这颗星的距离。在本文中,我们完善了星震学距离的确定,并通过M星的光谱视差通过独立测量来确定距离。 HST在1993年9月使用原始的行星相机观测到了PG 213l +066。滤光片F785LP和F555W的曝光都在0“ 3的距离处显示了伴星。图像的光度学为m_v = 18.97±0.15的主序列伴星提供了一个明显的量级,从中我们发现距离为560〜+ 200_-134 pc。我们还使用更新的模型和来自UV光谱的新光谱约束条件,重新计算了到白矮星的星震距离,新的地震距离为668〜+ 78_-83 pc,与该距离令人满意这些结果表明,这确实是一个物理双星,并且地震距离测定技术可能是确定到脉动的白前矮星的距离的最佳方法。

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