...
首页> 外文期刊>The Astrophysical journal >GALEX, Optical, and Infrared Light Curves of MQ Dra: UV Excesses at Low Accretion Rates
【24h】

GALEX, Optical, and Infrared Light Curves of MQ Dra: UV Excesses at Low Accretion Rates

机译:MQ Dra的GALEX,光学和红外曲线:低吸积率时紫外线过多

获取原文

摘要

Ultraviolet light curves constructed from near-ultraviolet (NUV) and far-ultraviolet (FUV) detectors on GALEX reveal large-amplitude variations during the orbital period of the low accretion rate polar MQ Dra (SDSS J1553+55). This unexpected variation from a UV source is similar to that seen and discussed in the polar EF Eri during its low state of accretion, even though the accretion rate in MQ Dra is an order of magnitude lower than even the low state of EF Eri. The similarity in phasing of the UV and optical light curves in MQ Dra imply a similar location for the source of light. We explore the possibilities of hot spots and cyclotron emission with simple models fit to the UV, optical, and IR light curves of MQ Dra. To match the GALEX light curves with a single-temperature circular hot spot requires different sizes of spots for the NUV and FUV, while a cyclotron model that can produce the optical harmonics with a magnetic field near 60 MG requires multipoles with fields 200 MG to match the UV fluxes.
机译:由GALEX上的近紫外(NUV)和远紫外(FUV)检测器构建的紫外光曲线显示,在低吸积率极地MQ MQ(SDSS J1553 + 55)的轨道周期内,振幅变化很大。尽管MQ MQ中的吸积率甚至比EF Eri的低态低一个数量级,但来自紫外线源的这种意想不到的变化类似于极性EF Eri在其低态时的观察和讨论。 MQ Dra中UV和光学光曲线的相位相似性意味着光源的位置相似。我们使用适合MQ MQ的UV,光学和IR光曲线的简单模型探索热点和回旋加速器发射的可能性。为了使GALEX光曲线与单温度圆形热点匹配,需要NUV和FUV具有不同大小的光斑,而回旋加速器模型可以在60 MG的磁场下产生光谐波,因此需要多极的场> 200 MG。匹配紫外线通量。

著录项

获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号