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PV CEP and V350 CEP: Stars on the Way between FUors and EXors
Astrophysics ( IF 0.5 ) Pub Date : 2021-06-17 , DOI: 10.1007/s10511-021-09680-5
H. R. Andreasyan , T. Yu. Magakian , T. A. Movsessian , A. V. Moiseev

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 Hα, [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 Hα 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 and 3.3 L, respectively. It is concluded that both stars may srepresent a so-called intermediate objects between the FUor and EXor classes.



中文翻译:

PV CEP 和 V350 CEP:FUors 和 EXors 之间的明星

根据 2015-2020 年的新观测和已发布的数据,对不寻常的喷发变量 PV Cep 和 V350 Cep 进行了检查。结果表明,PV Cep 经历了规律的爆发,随后亮度下降,从 2011 年到 2019 年总体持续,并且仍处于深度最小值。爆发伴随着包括Hα、[SII]和[OI]在内的许多线的强度和剖面的重大变化。禁线一般为负径向速度,可分为四个分量,速度和相对强度各不相同。V350 Cep 基本上在整个时间内都处于最大亮度水平,其光谱实际上没有改变。现有数据表明,V350 Cep 光谱中 Hα 谱线的明显 P Cyg 轮廓出现在 1986 年光度上升几年后。分别为和 3.3 L 。得出的结论是,两颗恒星都可能代表 FUor 和 EXor 类之间的所谓中间对象。

更新日期:2021-06-17
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