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arXiv 0907.0815astro-ph.SR
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开普勒星震目标的光度学研究

Photometric Study of Kepler Asteroseismic Targets

J. Molenda-Zakowicz, M. Jerzykiewicz, A. Frasca

摘要:

报告的是UBV和uvbybeta观测的15个候选人开普勒主要天体-地震目标和14个其他恒星在开普勒领域,进行了在M. G。卡塔尼亚天体物理观测站(Catania Astrophysical Observatory)这些数据用于绘制29颗恒星的双参数图,其中光度指数(如B-V或Δ m1)和大气参数(如MK型或[Fe/H])作为坐标。双参数图没有显示出星际变红的证据。光度指数B-V和β然后用于导出光度有效温度Teff(B-V)和Teff(β)。当Teff(B-V)> 6400 K时,Teff(B-V)和Teff(beta)的光度有效温度分别比光谱有效温度高311 +/- 34 K和346 +/- 91 K。当T_eff(B-V)< 6250 K时,T_eff(B-V)与光谱有效温度的关系非常好。由c_1和β导出的光度表面重力比光谱表面重力的范围大约大一倍。

英文摘要:

Reported are UBV and uvbybeta observations of 15 candidates for Kepler primary astero- seismic targets and 14 other stars in the Kepler field, carried out at the M.G. Fracastoro station of the Catania Astrophysical Observatory. These data serve to plot the 29 stars in two-parameter diagrams with the photometric indices (such as B-V or delta m1 and the atmospheric parameters (such as the MK type or [Fe/H]) as coordinates. The two-parameter diagrams show no evidence of interstellar reddening. The photometric indices B-V and beta are then used to derive photometric effective temperatures, Teff(B-V) and Teff(beta). For Teff(B-V) > 6400 K, the photometric effective temperatures turn out to be systematically higher than spectroscopic effective temperatures by 311 +/- 34 K and 346 +/- 91 K for Teff(B-V) and Teff(beta), respectively. For T_eff(B-V) < 6250 K, the agreement between Teff(B-V) and the spectroscopic effective temperatures is very good. The photometric surface gravities, derived from c_1 and beta, show a range of about a factor of two greater than their spectroscopic counterparts do.

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