October 2021 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 8906] ASASSN-21tg: superhump period
by Taichi Kato 20 Oct '21

20 Oct '21

ASASSN-21tg: superhump period Josch Hambsch has reported further observations. The amplitude of superhumps has grown (now more than 0.3 mag). The current superhump period is 0.0939(1) d (stage A).

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[vsnet-newvar 8905] ASASSN-21tg: new SU UMa-type dwarf nova
by Taichi Kato 19 Oct '21

19 Oct '21

ASASSN-21tg: new SU UMa-type dwarf nova Josch Hambsch has reported further observations. The object showed superhumps on Oct. 17. The period is not well determined, but is close to 0.1 d. The current amplitude is 0.2 mag. The object is not an AM CVn star as initially suggested from the decline rate of the precursor. The very rapid deline for this orbital period is exceptional. Further observations are needed.

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[vsnet-newvar 8904] XM78HT: new WZ Sge-type dwarf nova
by Taichi Kato 19 Oct '21

19 Oct '21

XM78HT: new WZ Sge-type dwarf nova Tonny Vanmunster has reported observations on two nights. The object showed early superhumps (double wave) with a period of 0.05404(4) d and an amplitude of 0.055 mag.

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[vsnet-newvar 8903] XM78HT (= AT 2021abog): large-amplitude dwarf nova outburst (mag. 13.5, in Andromeda)
by Patrick Schmeer 19 Oct '21

19 Oct '21

XM78HT = AT 2021abog (UG) https://www.aavso.org/vsx/index.php?view=detail.top&oid=2225109 The current outburst began on 2021 October 15 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/45247e54-7a67-4e39-b69d-21913… https://asas-sn.osu.edu/sky-patrol/coordinate/1520ddd9-d0f1-4592-9cf3-ac961… Time-resolved photometry is encouraged. Clear skies, Patrick

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[vsnet-newvar 8902] 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-newvar 8901] ASASSN-21tg: very rapid fading
by Taichi Kato 17 Oct '21

17 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-newvar 8900] 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-newvar 8899] 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-newvar 8898] 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-newvar 8897] 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-newvar October 2021