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

[vsnet-campaign-polar 157]Re: QS Tel low state (polar)
by Taichi Kato 13 May '23

13 May '23

Re: QS Tel low state (polar) There was apparently a problem with upper limits of ASAS-SN Sky Patrol Photom. DB. Not so faint in ATLAS (not in low state).

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[vsnet-campaign-polar 156]QS Tel low state (polar)
by Taichi Kato 12 May '23

12 May '23

QS Tel low state (polar) YYYYMMDD(UT) mag observer 20230323.3672 <18.321g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230328.3258 <18.528g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230329.3433 <18.004g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230330.1017 16.373g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230403.4127 <17.871g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230406.3018 <17.166g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230414.2952 <17.962g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230416.3240 <18.335g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230418.0318 15.757g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230426.2552 <18.222g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230429.0194 15.952g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230430.2412 <17.719g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230503.2269 <17.241g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230504.2295 <17.143g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230504.2295 <17.589g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230505.2908 <17.056g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230506.9500 16.467g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230506.9500 16.588g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.2116 <16.830g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.2116 <17.051g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-campaign-polar 153]AR UMa short-term variations
by Taichi Kato 06 May '23

06 May '23

AR UMa short-term variations Josch Hambsch reported time-resolved observations. In addition to the expected orbital modulation (0.7 mag), QPO-like variations were also recorded, which are often observed in polars.

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[vsnet-campaign-polar 152]Re: AR UMa bright state (polar)
by Taichi Kato 03 May '23

03 May '23

Re: AR UMa bright state (polar) Still bright. YYYYMMDD(UT) mag observer 20230426.2591 14.269o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.2609 14.298o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.2827 14.136o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230426.2868 14.300o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.3378 14.192o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.3409 13.951o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230502.3464 13.908o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) See (historical) references: https://ui.adsabs.harvard.edu/abs/1996ApJ...473..483S/abstract https://ui.adsabs.harvard.edu/abs/1994ApJ...426..288R/abstract https://ui.adsabs.harvard.edu/abs/1993IBVS.3890....1W/abstract

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[vsnet-campaign-polar 151]AR UMa bright state (polar)
by Taichi Kato 03 May '23

03 May '23

AR UMa bright state (polar) Long bright state probably first time since the 1990s. (Short brightening in 2021 May). Orbital modulations (as a polar) are very apparent and would be an interesting target. YYYYMMDD(UT) mag observer 20230221.7088 141cG (Yutaka Maeda) 20230226.5112 14.230g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230304.5086 14.143g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230305.1381 14.373g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230317.3885 14.041g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230318.3331 14.296g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230323.2519 14.278g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230325.4920 14.325g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230405.2185 14.356g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230410.3923 14.290g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230411.1975 14.519g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230412.4029 13.997g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230414.4357 14.272g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230415.8972 <146 (Jose Ripero) 20230416.3169 14.171g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230416.9056 <146 (Jose Ripero) 20230417.3071 14.178g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230419.2210 13.974g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230422.3850 14.095g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230425.2669 14.273g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230426.2239 13.946g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-campaign-polar 150]EF Eri: dips
by Taichi Kato 27 Dec '22

27 Dec '22

EF Eri: dips Observations by Kiyota-san and Itoh-san clearly shows short-duration dips such as at 2022 Dec. 25.618 (UT). These dips were not seen in every orbit but were present almost on every night. The durations were 2-3 min and were 0.8-mag deep. Ingress was slower and egress was sometimes sudden (within 30s).

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[vsnet-campaign-polar 149]Re: EF Eri profile
by Taichi Kato 26 Dec '22

26 Dec '22

Re: EF Eri profile Berto Monard has provided observations on 2006 Mar. 11 (one of high states in the 2000s). The orbital profile was similar to the current one (two maxima per period). It was not always the case in the past. See e.g.: https://ui.adsabs.harvard.edu/abs/1987A%26A...181L..15L/abstract

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[vsnet-campaign-polar 148]EF Eri profile
by Taichi Kato 25 Dec '22

25 Dec '22

EF Eri profile Kyoto U. team, Kiyota-san, Itoh-san, Peter Starr and Josch Hambsch have reported observation. The object shows very clear two peaks (full amplitude 0.7 mag) in one orbital period. The period 0.056269(3) d is in very good agreement with the published one. There is also a dip (somewhat variable), which may be an eclipse of/by the accretion column.

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[vsnet-campaign-polar 147]ASAS-SN light curve of EF Eri
by Taichi Kato 22 Dec '22

22 Dec '22

ASAS-SN light curve of EF Eri First high state since the start of ASAS-SN. https://asas-sn.osu.edu/sky-patrol/coordinate/97767859-7bac-4e8d-bdda-ded38…

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[vsnet-campaign-polar 146]EF Eri short-term variations
by Taichi Kato 21 Dec '22

21 Dec '22

EF Eri short-term variations Kyoto U. team obtained high time-resolution observations. The object showed QPO-like variations with time scales of about 5 min. They could arise from instabilities in the accretion column. Itoh-san and Kiyota-san also reported observations showing large modulations.

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