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

[vsnet-newvar 9627] Re: DDE 35: more likely a polar
by Taichi Kato 09 Dec '22

09 Dec '22

Re: DDE 35: more likely a polar E. Pavlenko has advised that this object is too blue for a polar. The data by Crimean Astrophys. Obs. team in 2020 showed flickering, but no indication of stable superhumps nor orbital variation. Although a period of 0.20976(3) d was suspected from CrAO observations (by my analysis), this period was not detected in the ZTF data. This object indeed looks like a CV with high/low states, but is certainly neither an SU UMa nor a polar. This object is currently in high state and would be an easy target for spectroscopy to determine the orbital period.

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[vsnet-newvar 9626] CRTSJ015051.5+332622 superoutburst continues
by Taichi Kato 08 Dec '22

08 Dec '22

CRTSJ015051.5+332622 superoutburst continues YYYYMMDD(UT) mag observer 20221124.5718 <159c (Yutaka Maeda) 20221126.5644 <161c (Yutaka Maeda) 20221202.5622 150c (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda) 20221207.5577 150:c (Yutaka Maeda)

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[vsnet-newvar 9625] MGAB-V279 brightening in standstill?
by Taichi Kato 08 Dec '22

08 Dec '22

MGAB-V279 brightening in standstill? (IW And star) YYYYMMDD(UT) mag observer 20221027.1552 15.902zg (ZTF Alert DC mag (Masci+ 2019)) 20221027.5353 150C (Masayuki Moriyama) 20221029.1246 15.995zg (ZTF Alert DC mag (Masci+ 2019)) 20221102.5423 <168C (Masayuki Moriyama) 20221103.5349 <168C (Masayuki Moriyama) 20221108.5131 150C (Masayuki Moriyama) 20221111.5189 150C (Masayuki Moriyama) 20221115.5229 149C (Masayuki Moriyama) 20221116.5020 <161C (Masayuki Moriyama) 20221119.5073 148C (Masayuki Moriyama) 20221124.4916 <165C (Masayuki Moriyama) 20221207.4238 146C (Masayuki Moriyama)

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[vsnet-newvar 9624] TCPJ05390410+4748030 outburst
by Taichi Kato 08 Dec '22

08 Dec '22

TCPJ05390410+4748030 outburst Last superoutburst (12 mag, WZ Sge star) in 2019 Mar. YYYYMMDD(UT) mag observer 20221202.6045 <163c (Yutaka Maeda) 20221205.6262 <154c (Yutaka Maeda) 20221206.5979 <151c (Yutaka Maeda) 20221207.6004 137c (Yutaka Maeda) 20221207.6004 137c (Yutaka Maeda) Noise? YYYYMMDD(UT) mag observer 20221012.7455 146c (Yutaka Maeda) 20221013.7517 <159c (Yutaka Maeda) 20221014.7306 <155c (Yutaka Maeda) 20221015.7432 <148c (Yutaka Maeda) 20221018.7468 <164c (Yutaka Maeda)

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[vsnet-newvar 9623] Wils_SDSSJ074859.55+312512.6 superoutburst
by Taichi Kato 06 Dec '22

06 Dec '22

Wils_SDSSJ074859.55+312512.6 superoutburst Knwon eclipsing SU UMa star. YYYYMMDD(UT) mag observer 20221121.7604 <158c (Yutaka Maeda) 20221124.7265 <152c (Yutaka Maeda) 20221126.7269 <156c (Yutaka Maeda) 20221202.878 167C (Mitsutaka Hiraga) 20221205.7440 160:c (Yutaka Maeda)

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[vsnet-newvar 9622] CRTSJ015051.5+332622 superoutburst
by Taichi Kato 06 Dec '22

06 Dec '22

CRTSJ015051.5+332622 superoutburst Knwon SU UMa star. YYYYMMDD(UT) mag observer 20221121.1785 18.813zg (ZTF Alert DC mag (Masci+ 2019)) 20221121.2163 18.182zr (ZTF Alert DC mag (Masci+ 2019)) 20221121.7121 <151c (Yutaka Maeda) 20221123.2127 18.274zg (ZTF Alert DC mag (Masci+ 2019)) 20221123.2152 18.270zg (ZTF Alert DC mag (Masci+ 2019)) 20221123.2386 17.961zr (ZTF Alert DC mag (Masci+ 2019)) 20221123.2453 17.746zr (ZTF Alert DC mag (Masci+ 2019)) 20221123.5591 <155c (Yutaka Maeda) 20221124.5718 <159c (Yutaka Maeda) 20221126.5644 <161c (Yutaka Maeda) 20221202.5622 150c (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda) 20221205.5826 145cG (Yutaka Maeda)

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[vsnet-newvar 9621] DDE 35: more likely a polar
by Taichi Kato 03 Dec '22

03 Dec '22

DDE 35: more likely a polar This object was classified as an SU UMa star based on superhump detection (vsnet-alert 24074). These humps, however, were seen only on two nights (2020 Mar. 16 and 18) and no humps were apparent on Mar. 19. The ZTF data show distinct high and low states unlike an SU UMa star (currently in bright state starting from late 2021). The magnitude (around 16) in 2020 Mar. was too faint (M_V=+6.6) for a superoutburst. The behavior suggests that the object is likely a polar. I have not been able to detect an orbital period in the ZTF data.

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[vsnet-newvar 9620] ASASSN-13bz: SU UMa star (or even WZ Sge)
by Taichi Kato 03 Dec '22

03 Dec '22

ASASSN-13bz: SU UMa star (or even WZ Sge) Itoh-san detected superhumps on Dec. 3 (amplitude 0.12 mag). The period from single-night baseline is 0.059(1) d. I suspected this object to be an SS Cyg star based on the initial fading rate (0.2-0.4 mag/d) and the lack of superhumps, but this may have been a viscous decay phase of a WZ Sge star (considering the rarity of outbursts). Early superhumps may have not been present simply based on a low inclination.

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[vsnet-newvar 9619] ZTF22abteqxm: rapid fading from superoutburst
by Taichi Kato 03 Dec '22

03 Dec '22

ZTF22abteqxm: rapid fading from superoutburst YYYYMMDD(UT) mag observer 20221126.6388 168C (Masayuki Moriyama) 20221128.2014 16.925zr (ZTF Alert DC mag (Masci+ 2019)) 20221201.1529 18.921zr (ZTF Alert DC mag (Masci+ 2019)) 20221201.2202 19.080zg (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-newvar 9617] CRTS J220449.8+054852 superhump period
by Taichi Kato 02 Dec '22

02 Dec '22

CRTS J220449.8+054852 superhump period Tonny Vanmunster and Itoh-san have reported observations. The superhump period from these observations was 0.0948(1) d, slightly shorter than reported in [vsnet-alert 27150]. Large superhump amplitude. (Dear Tonny, your messages were again under "ASASSN-22ho: new SU UMa-type dwarf nova").

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