In the present paper, we report the photometric and spectroscopic observations of the pulsating star BL Cam obtained by the 1.88 m telescope at the Kottamia astronomical observatory (KAO). Fourier analysis of the light curves indicates one frequency, 25.14427 c/d, with harmonics 51.112 c/d, 33.388 c/d, and 17.72464 c/d. The frequency of 31-32 c/d reported in the literature is not detected in our data except for one close to 33.3882934 c/d. A total of 55 new times of maximum light have been presented. A new value of (1/P) dP/dt is estimated using the O-C diagram based on all newly obtained times of maximum light combined with those taken from the literature, assuming the periods are decreasing and changing smoothly. Using model atmosphere analysis, we computed the effective temperature and surface gravity as T_eff = 7625 ± 300 K and logg = 4.30 ± 0.37. The bolometric magnitude M_bol = 2.335, radius R = 1.69 R_⨀, luminosity L = 0.957 L_⨀, the mass M = 1.68M_⨀, and pulsation constant Q = 0.025 days. Locations of the star on the M-R and M-L diagrams indicate that it is close to the ZAMS track and is an unevolved star.

在本文中，我们报告了科塔米亚天文台 (KAO) 的 1.88 米望远镜对脉动星 BL Cam 进行的光度和光谱观测。光变曲线的傅里叶分析表明一个频率为 25.14427 c/d，谐波为 51.112 c/d、33.388 c/d 和 17.72464 c/d。除了接近 33.3882934 c/d 的频率外，我们的数据未检测到文献中报道的 31-32 c/d 的频率。总共呈现了55个新的最大光时代。(1/P) dP/dt 的新值是使用 OC 图估计的，该图基于所有新获得的最大光时间并结合从文献中获取的时间，假设周期正在减少和平稳变化。使用模型大气分析，我们计算了有效温度和表面重力作为 T _eff= 7625 ± 300 K 和 logg = 4.30 ± 0.37。辐射热震级 M _bol = 2.335，半径 R = 1.69 R _⨀，光度 L = 0.957 L _⨀，质量 M = 1.68M _⨀，脉动常数 Q = 0.025 天。恒星在 MR 和 ML 图上的位置表明它靠近 ZAMS 轨道，是一颗未演化的恒星。