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

[vsnet-chat 8985] ASASSN-V J040901.83+323955.6: likely CV
by Taichi Kato 01 Dec '21

01 Dec '21

ASASSN-V J040901.83+323955.6: likely CV = LAMOST J040901.83+323955.6 https://arxiv.org/abs/2111.13049 Strong He II and cannot be YSO. 040901.836 +323955.73 (2000.0) Gaia_DR2_169806552869700224 plx=0.289(0.042) dismod=12.7 pmra=1.557(0.089) pmdec=-2.252(0.041) G=14.615 BP=14.749 RP=14.291 040901.836 +323955.73 (2000.0) Gaia_EDR3_169806552869700224 plx=0.359(0.026) dismod=12.2 pmra=1.631(0.030) pmdec=-2.202(0.017) G=14.583 BP=14.739 RP=14.272 Too bright M_V for an ordinary NL?

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[vsnet-chat 8847] VSOLJ bulletin No.81
by meineko 21 Nov '21

21 Nov '21

Following VSOLJ bulletin are now available at http://vsolj.cetus-net.org/bulletin.html No.81 2021 Sep. Orbital and spin periods of the candidate white dwarf pulsar ASASSN-V J205543.90+240033.5 Taichi Kato, Franz-Josef Hambsch, Elena P. Pavlenko, Aleksei A. Sosnovskij Seiichiro Kiyota, VSOLJ

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[vsnet-chat 8981] ZTF19abzzuin: AM CVn star fading tail + rebrightenings
by Taichi Kato 14 Nov '21

14 Nov '21

ZTF19abzzuin: AM CVn star fading tail + rebrightenings https://www.aavso.org/vsx/index.php?view=detail.top&oid=2225215 ZTF data of this object showed typical fading tail and rebrightenings. Most likely WZ Sge-type AM CVn outburst. See: https://ui.adsabs.harvard.edu/abs/2021PASJ..tmp...89K/abstract

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[vsnet-chat 8980] Gaia21ecp: likely WZ Sge star
by Taichi Kato 13 Nov '21

13 Nov '21

Gaia21ecp: likely WZ Sge star Multiple rebrightenings in ZTF data.

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[vsnet-chat 8979] ZTFJ175758.83+242427.3 =Gaia21apv: eclipsing CV below the period gap
by Taichi Kato 13 Nov '21

13 Nov '21

ZTFJ175758.83+242427.3 =Gaia21apv: eclipsing CV below the period gap From ZTF data. Porb = 0.0850107(3) d. Min epoch = BJD 2458829.911. Likely UGSU:+E (eclipses are not as sharp as polars).

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[vsnet-chat 8977] BL Tel Apparent Unusual Fading
by Peter Williams 01 Nov '21

01 Nov '21

Hi All, I have been following the eclipsing system BL Tel in the lead-up to the up-coming eclipse predicted to centre on or around 2022 January 13, an unfortunately unfavourable event that coincides with this star passing through conjunction with the sun. The initial decline may be visible from early December and the recovery to mid-February 2022, depending upon local circumstances/conditions. However, during October BL Tel appears to have faded somewhat more than typically occurs during its small amplitude pulsations, as shown in the following visual observations: TELBL 20210926.384 68 WPX TELBL 20211004.429 70 WPX TELBL 20211005.424 72 WPX TELBL 20211025.495 71 WPX TELBL 20211029.449 71 WPX TELBL 20211031.444 76 WPX It is cloudy here tonight (Monday 01 Nov) and possibly will be for the next couple of Spring nights so I am unable to confirm this unusual behaviour. It would therefore be of assistance if others could check on BL Tel. It is far too early for onset of the next eclipse so it may be just BL Tel is having a "Betelgeuse moment" with a greater than usual amplitude at minimum during the semi-regular pulsations of the red component. Tks and regards Peter Williams Heathcote NSW 10x50mm binoculars

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[vsnet-chat 8976] Re: ATO J061.1478-31.0634 = Gaia19fes: orbital period
by Taichi Kato 30 Oct '21

30 Oct '21

> Couldn't this be an SU UMa-type dwarf nova with a long orbital period? No evidence for a superoutburst has yet been detected.

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[vsnet-chat 8975] Re: [vsnet-alert 23881] Re: ATO J061.1478-31.0634 = Gaia19fes: orbital period
by Patrick Schmeer 29 Oct '21

29 Oct '21

ATO J061.1478-31.0634 (UG) https://www.aavso.org/vsx/index.php?view=detail.top&oid=1499859 Couldn't this be an SU UMa-type dwarf nova with a long orbital period? And couldn't the long outburst in 2019 November have been a long normal one? (like those observed in e.g. V1006 Cyg and TU Men) Regards, Patrick ------- Am Mittwoch, 22. Januar 2020, 00:10:52 MEZ hat Taichi Kato <tkato(a)kusastro.kyoto-u.ac.jp> Folgendes geschrieben: > Should we take 0.122641(4) d as the orbital period? > And has the UGSU classification been confirmed? This one is SS Cyg star and the above period refers to the orbital one. No evidence of superhumps during the outburst. The object is already in quiescence and no further observations are particularly needed (unless it undergoes another outburst).

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[vsnet-chat 8974] TW Tri: IW And-like features
by Taichi Kato 29 Oct '21

29 Oct '21

TW Tri: IW And-like features Standstill ended with brightening twice: 2018 July and 2019 Dec.

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[vsnet-chat 8973] LT Eri: Z Cam (IW And?) + E
by Taichi Kato 22 Oct '21

22 Oct '21

LT Eri: Z Cam (IW And?) + E From ZTF+ASAS-SN data. Standstill in 2018 and the behavior looks like an IW And star (heartbeat).

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