- vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16055] ASASSN-21tg: brightened
by Taichi Kato 18 Oct '21

18 Oct '21

ASASSN-21tg: brightened Josch Hambsch has reported further observations. The object brightened again to 15 mag on Oct. 16 and probably reached a peak. A period near 0.0201 d is still detected.

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[vsnet-campaign-dn 16054] ASASSN-21tg: very rapid fading
by Taichi Kato 16 Oct '21

16 Oct '21

ASASSN-21tg: very rapid fading Josch Hambsch reported observations. The object faded from 16.6 to 17.4 between Oct. 14.975 to 15.100. The rapid fading suggests an AM CVn-type object. A period of 0.021(1) d has been detected, but this needs to be confirmed by further observations.

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[vsnet-campaign-dn 16053] Re: ASASSN-14cc
by Taichi Kato 16 Oct '21

16 Oct '21

Re: ASASSN-14cc Subject: [vsnet-outburst 27836] Re: ASASSN-14cc From: Patrick Schmeer via vsnet-outburst <vsnet-outburst(a)ooruri.kusastro.kyoto-u .ac.jp> Please also refer to https://arxiv.org/abs/2106.15104. The superhump period has been confirmed by TESS observations. A change in mass-transfer rate was also suggested.

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[vsnet-campaign-dn 16052] PNV J00444033+4113068: color in quiescence
by Taichi Kato 16 Oct '21

16 Oct '21

PNV J00444033+4113068: color in quiescence 004440.3 +411306 (2000.0) LGGS_J004440.35+411306.9 V=22.278 B-V=0.310 U-B=-0.627 V-R=0.059

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[vsnet-campaign-dn 16051] TCP J01535830+5937545: likely superoutburst of an SU UMa star
by Taichi Kato 15 Oct '21

15 Oct '21

TCP J01535830+5937545: likely superoutburst of an SU UMa star Type from ZTF data. Apparent superoutburst in 2019 Nov. YYYYMMDD(UT) mag observer 20211010.6888 170:C (Masayuki Moriyama) 20211011.8173 163:C (Masayuki Moriyama)

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[vsnet-campaign-dn 16050] Re: PNV J00444033+4113068: updated period of early superhumps
by Taichi Kato 15 Oct '21

15 Oct '21

Re: PNV J00444033+4113068: updated period of early superhumps > Tamas Tordai and Tonny Vanmunster have reported new > observations. Sano-san also reported observations. The result is unchanged.

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[vsnet-campaign-dn 16049] PNV J00444033+4113068: updated period of early superhumps
by Taichi Kato 15 Oct '21

15 Oct '21

PNV J00444033+4113068: updated period of early superhumps Tamas Tordai and Tonny Vanmunster have reported new observations. The best period using these observations is 0.05543(2) d. The double wave profile is very apparent. The deeper minima appear to be partially caused by eclipses. These eclipses will become more apparent when ordinary superhumps appear.

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[vsnet-campaign-dn 16048] ASASSN-21sz: new SU UMa-type dwarf nova
by Taichi Kato 14 Oct '21

14 Oct '21

ASASSN-21sz: new SU UMa-type dwarf nova Josch Hambsch has reported observations. The data showed 0.20 mag superhumps with a period of 0.065(2) d.

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[vsnet-campaign-dn 16047] Re: ASASSN-14cc
by Patrick Schmeer 14 Oct '21

14 Oct '21

ASASSN-14cc (AM CVn star) https://www.aavso.org/vsx/index.php?view=detail.top&oid=398940 Apparently not much activity in recent months: after a normal outburst on 2021 May 23, the only recorded brightening was a double outburst on August 4-10 and 13-18, according to ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) data. https://asas-sn.osu.edu/sky-patrol/coordinate/d031a323-285e-44df-9854-81a0e… Regards, Patrick ------- Taichi Kato wrote on Wednesday, 28 January 2015, 07:40:45 UTC: ASASSN-14cc Let's continue observations in the next season, too. http://arxiv.org/abs/1501.06659 Title: ASASSN-14cc: Likely Helium Analog of RZ Leonis Minoris Authors: Taichi Kato (Kyoto U), Franz-Josef Hambsch (GEOS, BAV, Vereniging Voor Sterrenkunde), Berto Monard (Center for Backyard Astronomy Kleinkaroo) Categories: astro-ph.SR Comments: 5 pages, 5 figures, accepted for publication in PASJ (Letters) License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/ \\ 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 decline rate exceeds 2.8 mag/d. The duration of long outbursts is 9-18 d, comprising 50-60% of the recurrence time of long outbursts. We detected 0.01560-0.01562 d (22.5 min) modulations during long outbursts, which we identified to be superhumps. These features indicate that ASASSN-14cc has outburst parameters very similar to the extreme 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 (AM CVn-type object) of RZ LMi. The highest outburst activity among AM CVn-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.

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[vsnet-campaign-dn 16046] MGAB-V233 superoutburst
by Taichi Kato 13 Oct '21

13 Oct '21

MGAB-V233 superoutburst SU UMa star with a short supercycle. YYYYMMDD(UT) mag observer 20210819.7185 164C (Masayuki Moriyama) 20210928.6116 152C (Masayuki Moriyama) 20211001.7142 153C (Masayuki Moriyama) 20211007.6637 154C (Masayuki Moriyama) 20211010.6187 153C (Masayuki Moriyama)

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