激变变星LY UMa的BV测光研究
BV photometry of the cataclysmic variable LY UMa
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中文总结 AI 辅助
通过对矮新星候选体LY UMa的BV波段测光，结合GAIA距离数据，确定其质量供体类型及星等，同时测得邻近活动星系核Mrk 153的V波段星等，验证了其激变变星属性。
中文摘要 AI 辅助
我们对可能为矮新星的LY UMa进行了B、V波段测光，测得2024年4月14日V波段视星等为15.26±0.03，2025年4月28日为15.43±0.02，2025年6月2日为15.57±0.02；结合GAIA测得的距离d=310pc，算出对应绝对V波段星等M_V=7.94-8.10，表明其质量供体为K7-K8V型恒星，M_V=8.0-8.5。我们的B波段测量显示LY UMa的B-V指数略蓝于其供体，符合其激变变星的属性；在LY UMa附近的活动星系核Mrk 153，我们估计其V波段星等为14.81±0.03。
英文摘要
We performed B- and V-band photometry of the probable dwarf nova LY UMa. We find that it has apparent magnitude V=15.26+/-0.03 on 2024-04-14, V=15.43+/-0.02 on 2025-04-28, and V = 15.57+/-0.02 on 2025-06-02. Using the GAIA distance d=310pc, we find that the lower values correspond to absolute V band magnitude M_V=7.94-8.10 and indicate that the mass donor of LY UMa is a K7-K8V star with M_V=8.0-8.5. Our B-band measurements show slightly bluer B-V index of LY UMa than that of its donor, consistent with its nature as a cataclysmic variable. Close to LY UMa is the Active Galaxy Nucleus Mrk 153, for which we estimate V=14.81+/-0.03.
