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

[vsnet-campaign-polar 145]Re: EF Eri (polar) still bright
by Taichi Kato 20 Dec '22

20 Dec '22

Re: EF Eri (polar) still bright Peter Starr reported time-resolved observations. Variations up to 0.8 mag were present.

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[vsnet-campaign-polar 144]EF Eri (polar) still bright
by Taichi Kato 20 Dec '22

20 Dec '22

EF Eri (polar) still bright Large-amplitude variations were suggested from observations by Josch Hambsch. The time resolution was not enough. Observations with higher time resolution are recommended. YYYYMMDD(UT) mag observer 20221123.5642 <162C (Masayuki Moriyama) 20221216.624 148 (Rod Stubbings) 20221216.651 147 (Rod Stubbings) 20221216.658 147 (Rod Stubbings) 20221217.483 146 (Rod Stubbings) 20221218.076 14.26C (Gary Poyner) 20221218.0759 14.20C (Masao Funada) 20221218.878 14.11C (Gary Poyner) 20221218.8778 13.94C (Masao Funada)

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[vsnet-campaign-polar 143]Re: EF Eri in active state!
by Taichi Kato 17 Dec '22

17 Dec '22

> The polar EF Eri is in an active state. > > ERIEF 221216.624 148 > ERIEF 221216.651 147 > ERIEF 221216.659 147 This is rare and very important. This polar has a brown-dwarf secondary and has a low mass-transfer rate.

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[vsnet-campaign-polar 142]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-campaign-polar 141]DDE 35: more likely a polar
by Taichi Kato 04 Dec '22

04 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-campaign-polar 140]IPHAS J184326.48+060800.9 (eclipsing polar) high state
by Taichi Kato 27 Oct '21

27 Oct '21

IPHAS J184326.48+060800.9 (eclipsing polar) high state http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21ewn/ High state of this polar has not been seen in the ZTF data. First time in recent years. See [vsnet-chat 8874] (Sep. 22) about the nature of this object.

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[vsnet-campaign-polar 139]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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