标题： RX J2309.8+2135作为附近矮新星候选体的天文学认证 显示英文标题

标题： Astrometric authentication of RX J2309.8+2135 as a nearby dwarf nova candidate

摘要： RX J2309.8+2135 = 1RXS J230949.6+213523 是通过ROSAT全天扫描发现的一个X射线源。 该天体后来被确认与一颗表现出类似激变变星（CV）光谱的恒星相一致。 Schwope等人（2002，astro-ph/0210059）最近提出了M3型光谱分类，这表明它距离较近。 我们检测到了这个天体较大的自行（~69 mas/yr）。 这一检测证实了RX J2309.8+2135作为一个附近的矮新星候选体。 即使从测量到的自行推断的距离（约100 pc）来看，RX J2309.8+2135的爆发峰值仍可达V~9。 RX J2309.8+2135可能属于一个之前未识别的长周期CV子类，具有最低的质量转移率。 显示英文摘要

摘要： RX J2309.8+2135 = 1RXS J230949.6+213523 is an X-ray source discovered through the ROSAT all-sky survey. The object was later identified with a star showing a spectrum resembling a cataclysmic variable (CV). Schwope et al. (2002, astro-ph/0210059) recently proposed the spectral type of M3, which would indicate a small distance. We have detected a large proper motion (~69 mas/yr) of this object. This detection authenticates RX J2309.8+2135 as a nearby dwarf nova candidate. Even at a reasonable distance of ~100 pc, which is inferred from the measured proper motion, the outburst maxima of RX J2309.8+2135 would reach V~9. RX J2309.8+2135 may belong to a hitherto unidentified class of long-period CVs with the lowest mass-transfer rates.