标题： X射线暂现源RX J0117.6-7330的光学对应体：光谱学和 photometry 显示英文标题

标题： The Optical Counterpart of the X-ray Transient RX J0117.6-7330: Spectroscopy and Photometry

摘要： 我们对位于大小麦哲伦云宁静态下的X射线暂现源RX J0117.6-7330的光学对应体进行了光谱和测光观测。 主星被确认为一颗B0.5 IIIe型星，质量M = (18 ± 2) M(sun)，光度M(bol) = -7.4 ± 0.2。 主要的光谱特征包括强H-alpha发射线，H-beta和H-gamma发射核伴吸收翼，以及窄的HeI和OII吸收线。 主要谱线的等效宽度和FWHM被列出。 我们的观测期间平均系统速度为v(r) = (184 ± 4) km/s；需要更长时间的测量来确定双星周期和主星的K速度。 我们测定Be星的投影旋转速度为v sin i = (145 ± 10) km/s，并推断系统的倾角为i = (21 ± 3)deg。 显示英文摘要

摘要： We conducted spectroscopic and photometric observations of the optical counterpart of the X-ray transient RX J0117.6-7330 in the Small Magellanic Cloud, during a quiescent state. The primary star is identified as a B0.5 IIIe, with mass M = (18 +/- 2) M(sun) and bolometric magnitude M(bol) = -7.4 +/- 0.2. The main spectral features are strong H-alpha emission, H-beta and H-gamma emission cores with absorption wings, and narrow HeI and OII absorption lines. Equivalent width and FWHM of the main lines are listed. The average systemic velocity over our observing run is v(r) = (184 +/- 4) km/s; measurements over a longer period of time are needed to determine the binary period and the K velocity of the primary. We determine a projected rotational velocity v sin i = (145 +/- 10) km/s for the Be star, and we deduce that the inclination angle of the system is i = (21 +/- 3)deg.