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arXiv 0902.1159astro-ph.SR
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RRd星V372 Ser的五色测光

Five colour photometry of the RRd star V372 Ser

J. M. Benko, S. Barcza

摘要:

本文首次给出了RRd星V372 Ser的UBV(RI)_C时间序列测光结果,以确定该星的一些参数。2007年4月和5月,在Konkoly和Teide天文台获得了2812个U,B,V,R_C,I_C帧,从文献中收集了1508个V观测。傅立叶拟合的光变曲线已在所有波段推导。非线性耦合频率f_0=(2.121840+/-.000001)c/天,f_1=(2.851188+/-.000001)c/d,即周期P_0=0.4712891+/-.0000002天,P_1=0.3507310+/-.0000001 d,P_1/P_0=0.7441950,振幅A_0(V)=0.15399 mag,A_1(V)= 0.20591mag,求出了相位,求出了不同波段振幅比的平均值,得到A_1/A_0=1.319+/-.008,即第一泛音是主要的脉动模式。从V观测值给出了傅立叶参数长期变化的上限。给出了球状星团M3和IC 4499中RRd星的周期比和周期分布、质量、光度和金属丰度的估计。

英文摘要:

The first UBV(RI)_C time series photometry of the RRd star V372 Ser is presented to determine some parameters of the star. In April, May 2007 2812 U, B, V, R_C, I_C frames were obtained at Konkoly and Teide Observatories, 1508 V observations were collected from the literature. Fourier fitted light curves have been derived in all bands. The non-linearly coupled frequencies f_0=(2.121840+/-.000001) c/day, f_1=(2.851188+/-.000001) c/d, i.e. periods P_0=0.4712891+/-.0000002 days, P_1=0.3507310+/-.0000001 d, P_1/P_0=0.7441950, amplitudes A_0(V)=0.15399 mag, A_1(V)=0.20591 mag, and phases have been found. A_1/A_0=1.319+/-.008 has been found from averaging the amplitude ratio in the different bands i.e. the first overtone is the dominant pulsation mode. From the V observations upper limits are given for secular change of the Fourier parameters. The period ratio and period put V372 Ser among the RRd stars of the globular clusters M3 and IC 4499, mass, luminosity, and metallicity estimates are given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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