November 2021 - vsnet-chat - ooruri.kusastro.kyoto-u.ac.jp

[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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