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

[vsnet-newvar 8896] 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-newvar 8895] ASASSN-21sz: new SU UMa-type dwarf nova
by Taichi Kato 15 Oct '21

15 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-newvar 8894] Re: ASASSN-14cc
by Patrick Schmeer 15 Oct '21

15 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-newvar 8893] 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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[vsnet-newvar 8892] PNV J00444033+4113068: new WZ Sge-type dwarf nova
by Taichi Kato 13 Oct '21

13 Oct '21

PNV J00444033+4113068: new WZ Sge-type dwarf nova Tamas Tordai has reported observations. The object showed large-amplitude (0.7 mag!) early superhumps with a period of 0.0553(4) d. This object must have a high inclination and further observations are very encouraged.

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[vsnet-newvar 8891] ASASSN-21sz
by Taichi Kato 12 Oct '21

12 Oct '21

ASASSN-21sz ASASSN-21sz --- ------- 21:48:30.31 -35:38:49.3 2021-10-7.14 13.56 SDSS DSS VIZIER ------- CV candidate, matches to GAIA DR2 G=18.6, g>17.8 on 2021-10-05.08, g=14.0 on 2021-10-06.11, g=14.1 on 2021-10-07.17, g=14.6 on 2021-10-10.05 ASASSN-21sz 20211005.08 <178g ASN ASASSN-21sz 20211007.17 141g ASN ASASSN-21sz 20211010.05 146g ASN 214830.443 -353848.98 (2000.0) Gaia_DR2_6587981306620492672 plx=2.019(0.320) dismod=8.5 pmra=29.370(0.384) pmdec=-19.011(0.399) G=18.596 BP=18.625 RP=18.304 214830.444 -353848.99 (2000.0) Gaia_EDR3_6587981306620492672 plx=1.926(0.170) dismod=8.6 pmra=29.685(0.155) pmdec=-18.968(0.107) G=18.618 BP=18.722 RP=18.449 214831.2 -353851 (2000.0) 1RXS_J214831.3-353852 0.055 0.39 0.62

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[vsnet-newvar 8890] ZTF18abttrrr (polar) outburst
by Taichi Kato 08 Oct '21

08 Oct '21

ZTF18abttrrr (polar) outburst http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21eni/ Gaia21eni AT2021aath 2021-09-28 00:17:37 261.87116 13.43388 17.97 19.22 0.09 unknown 2021-10-07 22:24:13 ~1.5 mag outburst in Gaia source, previously identified as a polar-type CV

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[vsnet-newvar 8889] MASTER OT J174816.22+501723.3 superoutburst
by Taichi Kato 08 Oct '21

08 Oct '21

MASTER OT J174816.22+501723.3 superoutburst YYYYMMDD(UT) mag observer 20210924.4265 <162c (Yutaka Maeda) 20211001.1563 19.704zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211001.4063 <159c (Yutaka Maeda) 20211002.4068 152:cG (Yutaka Maeda) 20211003.1365 15.745zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211003.4050 156:c (Yutaka Maeda) 20211003.8547 15.55C (Masao Funada) 20211004.4200 <148c (Yutaka Maeda) 20211005.4050 152:cG (Yutaka Maeda) 20211006.4033 156:c (Yutaka Maeda)

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[vsnet-newvar 8888] ASASSN-14lb rare outburst
by Taichi Kato 08 Oct '21

08 Oct '21

ASASSN-14lb rare outburst Last seen in outburst on 2018 Sep. 16 (17.0 mag). YYYYMMDD(UT) mag observer 20210918.7208 <155c (Yutaka Maeda) 20210919.7449 <155c (Yutaka Maeda) 20210923.6947 <165c (Yutaka Maeda) 20210924.6981 <154c (Yutaka Maeda) 20210928.7029 <169c (Yutaka Maeda) 20211001.6734 <156c (Yutaka Maeda) 20211002.6735 <157c (Yutaka Maeda) 20211003.7093 <163c (Yutaka Maeda) 20211004.6647 158:c (Yutaka Maeda) 20211005.6540 160c (Yutaka Maeda) 20211006.6485 157:c (Yutaka Maeda)

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[vsnet-newvar 8887] Gaia17cuh: SS Cyg
by Taichi Kato 06 Oct '21

06 Oct '21

Gaia17cuh: SS Cyg Not SU UMa. From ZTF data.

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vsnet-newvar October 2021