5 papers · 1 filter
Astrometric authentication of RX J2309.8+2135 as a nearby dwarf nova candidate
T. Kato, H. Yamaoka
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…
NSV 10934: an Unusual ROSAT-Selected Dwarf Nova: An Analogous Object to HT Cam?
T. Kato, R. Stubbings, H. Yamaok +4
NSV 10934 was discovered as a large-amplitude suspected variable star of unknown classification. We noticed that the object is identified with a bright ROSAT X-ray source (1RXS J18…
Unusually Increased Activity of GZ Cnc
T. Kato, P. A. Dubovsky, R. Stubbings +1
GZ Cnc was discovered as a variable star by Takamizawa (Tmz V34), which turned out to a cataclysmic variable (CV). Past studies have shown that this object is a good candidate for…
Unusual Outbursting State of a Z Cam-Type Star HL CMa
T. Kato
HL CMa is a Z Cam-type dwarf nova which was discovered as an Einstein X-ray source. In addition to normal outbursts and standstills, we noticed the presence of "the third" outburst…
V893 Sco Is Not an ER UMa-Type Star
T. Kato, K. Matsumoto, M. Uemura
V893 Sco is a recently rediscovered bright eclipsing dwarf nova below the period gap. Most recently, Mason et al. (2001) proposed an idea that V893 Sco is an ER UMa-type dwarf nova…