标题： PV Cep和V350 Cep：介于FUors和EXors之间的恒星 显示英文标题

标题： PV Cep and V350 Cep: stars on the way between FUors AND EXors

摘要： 基于2015-2020年的新观测和已发表的数据，对不寻常的爆发变星PV Cep和V350 Cep进行了检查。 结果显示，PV Cep经历了一次规律的爆发，随后亮度下降，整体持续时间从2011年到2019年，并且仍然处于深度最小值。 这次爆发伴随着若干谱线强度和轮廓的显著变化，包括Ha、[SII]和[OI]。 禁线通常具有负的径向速度，并可分为四个组分，其速度和相对强度各不相同。 V350 Cep基本上在整个时间段内都处于最大亮度水平，其光谱几乎未改变。 现有数据表明，V350 Cep光谱中Ha线明显的P Cyg轮廓是在光度上升几年后出现的，即1986年。 当前状态下，这两颗恒星的光度分别估计为20 L(sun)和3.3 L(sun)。 结论是，这两颗恒星可能代表了FUor类和EXor类之间的所谓中间天体。 显示英文摘要

摘要： Based on new observations during 2015-2020 and published data, the unusual eruptive variables PV Cep and V350 Cep are examined. It is shown that PV Cep underwent a regular outburst followed by a drop in brightness that lasted overall from 2011 to 2019 and is still in a deep minimum. The outburst was accompanied by substantial changes in the intensity and profiles of a number of lines, including Ha, [SII], and [OI]. The forbidden lines generally have negative radial velocities and can be divided into four components, with variable velocities and relative intensities. V350 Cep essentially is at a maximum brightness level over the entire time and its spectrum is practically unaltered. The available data suggest that the pronounced P Cyg profile of the Ha line in the spectrum of V350 Cep appeared several years after the luminosity rise, in 1986. The luminosities of the stars in the current state are estimated to be 20 L(sun) and 3.3 L(sun), respectively. It is concluded that both stars may represent a so-called intermediate objects between the FUor and EXor classes.