New diameter measurements of 10 Mira Variables: implications for effective temperatures, atmospheric structure and pulsation modes
New diameter measurements of 10 Mira Variables: implications for effective temperatures, atmospheric structure and pulsation modes
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10 个 Mira 变量的新直径测量：对有效温度、大气结构和脉动模式的影响
DOI：
10.1093/mnras/276.2.640
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发表时间：
1995
影响因子：
4.8
通讯作者：
P. Tuthill
中科院分区：
文献类型：
--
作者：
C. Haniff;M. Scholz;P. Tuthill
我们提出了新的和精确的多波长角直径测量的10个长周期变量。在对边缘暗化和光球扩展进行校正后，我们利用这些数据研究了恒星的有效温度、物理直径和脉动模式。对于样本中的所有10颗恒星，我们的测量意味着光球半径超过350 R，从而支持Tuthill等人最近的结果。除非Miras的质量尺度增加至少两倍，或者我们目前对它们的周期-光度关系的理解是不正确的，我们的数据提供了强有力的证据，反对周期在280 - 430 d范围内的Mira变星的基模脉动。
We present new and precise multi-wavelength angular diameter measurements for 10 long-period variables. After correction for limb-darkening and photospheric extension, we use these to investigate the effective temperatures, physical diameters and pulsation modes of the stars. For all 10 stars in the sample, our measurements imply photospheric radii in excess of 350 R⊙, thereby supporting the recent result of Tuthill et al. Unless the favoured mass scale for Miras is increased by at least a factor of two, or our current understanding of their period-luminosity relation is incorrect, our data provide strong evidence against fundamental-mode pulsation in Mira variables with periods in the range 280 – 430 d.