论文标题
新的$δ$ Scuti星ASAS J063309+1810.8的光谱和光度研究
Spectroscopic and Photometric Study of the new $δ$ Scuti Star ASAS J063309+1810.8
论文作者
论文摘要
我们提出了由Kottamia天文天文台1.88 m望远镜（KAO）收集的BVR观测值和低分辨率光谱，用于新的脉动星ASAS J063309+1810.8（以下称为ASAS06+18）。光度分析表明，该恒星是$δ$ SCUTI星，幅度低（a = 0.054-0.099 in V mag。）和短期（102.604 min）。光曲线的傅立叶分析揭示了两个谐波的基本模式。光度分析得出的更新频率的新值为13.0035232 CD-1，幅度为49.93 mmag在阶段为0.326和S/N 21.75，并为两个频率（20.2099237CD-1，5.9130945cd-1）。鉴于可用的数据，显示了37个新的最大光的新时间，并为星及其O-C数据提供了更新的埃菲米利。假设其周期降低并平稳地变化，则确定（1/p）DP/DT的新值。我们将有效的温度和表面重力计算为TEFF = 7125+-250 K和log G = 4.0+-0.2 DEX在不同阶段的恒星光谱模型大气分析中。骨化幅度MBOL = 2.798（0.016），半径r = 1.577（0.077）r_sun，光度L = 5.714（1.066）l_sun，质量为m = 1.595 m_sun和脉动常数Q = 0 {M} .0338（0.0003）。讨论了恒星在进化的质量亮度和质量拉迪乌斯关系中的位置。
We present BVR observations and low-resolution spectra collected by the Kottamia Astronomical Observatory 1.88 m telescope (KAO) for the new pulsating star ASAS J063309+1810.8 (hereafter it will be called ASAS06+18). The photometric analysis revealed that the star is a $δ$ Scuti star with low amplitude (a=0.054-0.099 in V mag.) and a short period (102.604 min). Fourier analysis of the light curves reveals the fundamental mode with two harmonics. The photometric analysis yielded a new value of the updated frequency of 13.0035232 cd-1 with an amplitude of 49.93 mmag at phases 0.326 and S/N 21.75 and to two frequencies (20.2099237cd-1, 5.9130945cd-1). Given the available data, 37 new times of maximum light are presented, and an updated ephemeris for the star and its O-C data. Assuming its period decreases and changes smoothly, a new value of (1/P)dP/dt is determined. We calculated the effective temperature and surface gravity as Teff=7125+- 250 K and log g=4.0+-0.2 dex from model atmosphere analysis of the star's spectra at different phases. The bolometric magnitude Mbol=2.798 (0.016), radius R=1.577(0.077) R_sun, luminosity L=5.714(1.066) L_sun, the mass is M=1.595 M_sun and pulsation constant Q=0{m}.0338(0.0003). The star's locations in the evolutionary mass-luminosity and mass-radius relationships are discussed.
