ASASSN-14cc: A likely helium analog of RZ Leonis Minoris

作者：Kato Taichi; Hambsch Franz Josef; Monard Berto

来源：Publications of the Astronomical Society of Japan, 2015, 67(2): L2.

DOI：10.1093/pasj/psv010

• accretion, accretion disks
• novae, cataclysmic variables
• stars: dwarf novaestars: individual (ASASSN-14cc)

We identified that ASASSN-14cc is a very active dwarf nova spending approximately 60% of the time in outburst. Our long-term photometry revealed that the object shows long outbursts recurring with a period of 21-33 d and very brief short outbursts lasting less than 1 d. The maximum fading rate exceeds 2.8 mag d(-1). The duration of the long outbursts is 9-18 d, comprising 50%-60% of the recurrence time of long outbursts. We detected 0.01560-0.01562 d (22.5min) modulations during long outbursts, which we identified as superhumps. These features indicate that ASASSN-14cc has outburst parameters very similar to the extremely unusual dwarf nova RZ LMi but with a much shorter superhump period. All the observations can be naturally understood, considering that this object is a helium analog (AMCVn-type object) of RZ LMi. The highest outburst activity among AMCVn-type objects can be understood as the high-mass transfer rate expected for the orbital period giving a condition close to the stability limit of the accretion disk. In contrast to RZ LMi, this object shows little evidence for premature quenching of the superoutburst, which has been proposed to explain the unusual outburst parameters in RZ LMi.

• 出版日期2015-4