标题： V0332+53的Be/X射线暂现源：轨道与赤道平面之间存在倾斜的证据吗？ 显示英文标题

标题： The Be/X-ray Transient V0332+53: Evidence for a tilt between the orbit and the equatorial plane?

摘要： 我们提供了BQ Cam的光学和红外观测结果，BQ Cam是Be/X射线暂现源V0332+53的光学对应体。 BQ Cam被证明是一颗O8-9Ve型恒星，这将V0332+53的距离确定为约7千秒差距。 利用H-alpha光谱和红外测光来讨论周围恒星包层的演化。 由于系统的倾角较低，参数受到强烈限制。 我们发现轨道平面相对于周围恒星盘（可能在赤道平面上）存在倾斜的有力证据。 尽管近日点距离仅为约10 R_*，但在当前平静状态下，周围恒星盘并未延伸到近日点通过的距离。 在这些条件下，X射线辐射因吸积的离心抑制而被有效阻止。 显示周围恒星盘在光学和红外波长下是光学致密的，加上其尺寸较小，被当作潮汐截断的指示。 显示英文摘要

摘要： We present optical and infrared observations of BQ Cam, the optical counterpart to the Be/X-ray transient system V0332+53. BQ Cam is shown to be an O8-9Ve star, which places V0332+53 at a distance of ~7 kpc. H-alpha spectroscopy and infrared photometry are used to discuss the evolution of the circumstellar envelope. Due to the low inclination of the system, parameters are strongly constrained. We find strong evidence for a tilt of the orbital plane with respect to the circumstellar disc (pressumably on the equatorial plane). Even though the periastron distance is only ~ 10 R_*, during the present quiescent state the circumstellar disc does not extend to the distance of periastron passage. Under these conditions, X-ray emission is effectively prevented by centrifugal inhibition of accretion. The circumstellar disc is shown to be optically dense at optical and infrared wavelengths, which together with its small size, is taken as an indication of tidal truncation.