Abstract

We explain the details of the photometric operation mode of the ASTRONICAM near-IR spectrograph camera mounted on the 2.5-m telescope of the Caucasian Mountain Observatory of the Sternberg Astronomical Institute and describe algorithms used for primary correction and overall pipeline reduction of the acquired data. We present the transformation equations from the 2MASS photometric system to the instrumental \(Y\)-band system. We derive color transformation coefficients between the instrumental photometric system and standard MKO-NIR (Mauna Kea Observatories Near-Infrared) system for the \(J\), \(H\), and \(K\)-band filters and show that the camera system is close to the standard photometric system. We found that in the case of observations at zenith, average background brightness level, and \(1^{\prime\prime}\) seeing the stars with \(J=22^{\textrm{m}}\), \(H=20\overset{\textrm{m}}{.}5\), \(K=19\overset{\textrm{m}}{.}5\) can be measured with a 3000-s exposure at the signal-to-noise ratio \(SNR=3\).

中文翻译：

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ASTRONIRCAM 相机的光度操作模式

摘要

我们详细解释了安装在斯滕伯格天文研究所高加索山天文台 2.5 米望远镜上的 ASTRONICAM 近红外光谱相机的光度操作模式，并描述了用于对所获取的数据进行初级校正和整体简化的算法。我们提出了从 2MASS 光度系统到仪器\(Y\)波段系统的变换方程。我们推导了仪器测光系统和标准 MKO-NIR（莫纳克亚天文台近红外）系统之间的\(J\)、\(H\)和\(K\)带滤光片的颜色变换系数，并表明相机系统接近标准光度系统。我们发现，在天顶观测的情况下，平均背景亮度水平和\(1^{\prime\prime}\)看到的恒星具有\(J=22^{\textrm{m}}\)，\ (H=20\overset{\textrm{m}}{.}5\)、\(K=19\overset{\textrm{m}}{.}5\)可以在 3000 秒曝光下测量信噪比\(SNR=3\)。