GALANTE光度系统
The GALANTE Photometric System
摘要：
本文描述了GALANTE测光系统的特性，该系统是一个7个中窄带滤光片系统，波长覆盖范围从3000 $Å$到9000 $Å$。我们描述的测光系统，提出了完整的灵敏度曲线作为产品的过滤器的灵敏度，CCD，望远镜反射镜，和大气传输曲线，以及一些一阶和二阶矩的灵敏度函数。GALANTE测光系统由四个来自J-PLUS测光系统的滤光片、一个十二个宽至窄滤光片系统和三个专用滤光片组成，专门用于测量恒星的物理参数，如有效温度$T_{\rm eff}$、$\log(g)$、金属丰度、色余$E(4405-5495)$和消光类型$R_{5495}$。两个库，下一代光谱库（NGSL）和Maíz Apellániz & Weiler（2018）中提出的库，已用于确定斯隆数字巡天（$\textit{SDSS}$）$\textit{ugriz}$测光和GALANTE测光系统之间的转换方程。我们将使用这种变换来校准GALANTE图像的零点。为此，基于两个不同的$\textit{griz}$库（$\textit{SDSS}$ DR 12和ATLAS全天空恒星参考目录，以下简称$\textit{RefCat2}$）对GALANTE进行了初步的光度校准。两个零点之间的比较，导致我们选择$\textit{RefCat2}$作为本校准的基础目录，并适用于天鹅座OB 2协会的字段。
英文摘要：
This paper describes the characterization of the GALANTE photometric system, a seven intermediate- and narrow-band filter system with a wavelength coverage from 3000 $Å$ to 9000 $Å$ . We describe the photometric system presenting the full sensitivity curve as a product of the filter sensitivity, CCD, telescope mirror, and atmospheric transmission curves, as well as some first- and second-order moments of this sensitivity function. The GALANTE photometric system is composed of four filters from the J-PLUS photometric system, a twelve broad-to-narrow filter system, and three exclusive filters, specifically designed to measure the physical parameters of stars such as effective temperature $T_{\rm eff}$, $\log(g)$, metallicity, colour excess $E(4405-5495)$, and extinction type $R_{5495}$. Two libraries, the Next Generation Spectral Library (NGSL) and the one presented in Maíz Apellániz & Weiler (2018), have been used to determine the transformation equations between the Sloan Digital Sky Survey ($\textit{SDSS}$) $\textit{ugriz}$ photometry and the GALANTE photometric system. We will use this transformation to calibrate the zero points of GALANTE images. To this end, a preliminary photometric calibration of GALANTE has been made based on two different $\textit{griz}$ libraries ($\textit{SDSS}$ DR12 and ATLAS All-Sky Stellar Reference Catalog, hereinafter $\textit{RefCat2}$). A comparison between both zero points is performed leading us to the choice of $\textit{RefCat2}$ as the base catalogue for this calibration, and applied to a field in the Cyg OB2 association.
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