March 2022 - vsnet-chat - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-chat 9016] ASASSN-21mh: SU UMa star
by Taichi Kato 14 Mar '22

14 Mar '22

ASASSN-21mh: SU UMa star Superoutbursts in the ZTF data. Time-resolved ZTF data on 2020 July 13 detected superhumps. The superhump period was near 0.06 d.

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[vsnet-chat 9015] ASASSN-17eg: refined period and about type
by Taichi Kato 14 Mar '22

14 Mar '22

ASASSN-17eg: refined period and about type Using the ZTF data, I obtained a refined orbital period of 0.07859690(5) d. The mean light curve is unlike that of an short-period dwarf nova or novalike, but is a smooth sinusoidal one with a full amplitude of 0.26 mag. The object looks like to me basically a reflection variable. The 2019 outburst likely came from an accretion disk formed by a small amount of mass-transfer. The transverse velocity is twice larger than that of OV Boo and ASASSN-17eg is probably a population II binary.

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[vsnet-chat 9014] WFI J161953.3+031909: genuine eclipsing Z Cam (+SU UMa?) star in the period gap
by Taichi Kato 13 Mar '22

13 Mar '22

WFI J161953.3+031909: genuine eclipsing Z Cam (+SU UMa?) star in the period gap ZTF data indicate that this object is a genuine Z Cam star. Long standstill in 2021 Feb.-Sep. There has been no indication of the IW And-type phenomenon. Long outbursts in 2019 may have been superoutbursts. The supercycle(?) was 70-90 d with a long duty cycle. This would be classified as UGZ+UGSU(ER):+E.

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[vsnet-chat 9013] TT Tri: IW And star
by Taichi Kato 12 Mar '22

12 Mar '22

TT Tri: IW And star > [vsnet-chat 8118] TT Tri: low amplitude Z Cam star? Now it is apparent that this is an IW And star from the ZTF data. Standstill to outburst in 2018 (four times). Currently in standstill.

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[vsnet-chat 9012] V598 Peg outburst in 2020
by Taichi Kato 12 Mar '22

12 Mar '22

V598 Peg outburst in 2020 According to the ZTF data, there was an outburst with two peaks in 2020 Nov. The second peak was brighter (16.0-17.2 g).

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[vsnet-chat 9011] V1229 Her: likely SU UMa star
by Taichi Kato 12 Mar '22

12 Mar '22

V1229 Her: likely SU UMa star Long outburst (g=14.2) in 2021 Sep.-Oct. in ZTF data.

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[vsnet-chat 9010] Orbital period of V654 Aur
by Taichi Kato 12 Mar '22

12 Mar '22

Orbital period of V654 Aur Using ZTF data, I obtained P=0.1060748(1) d. Polar.

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[vsnet-chat 9009] VSOLJ Variable Star Bulletin
by meineko 12 Mar '22

12 Mar '22

New No.95 is available at http://vsolj.cetus-net.org/bulletin.html No.95 V476 Cyg (Nova Cyg 1920) is currently a dwarf nova — first such an object in the period gap? Taichi Kato -------------- Seiichro Kiyota VSOLJ

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[vsnet-chat 9007] VSOLJ Variable Star Bulletin
by meineko 10 Mar '22

10 Mar '22

New issues of VSOLJ Variable Star Bulletin are now available at http://vsolj.cetus-net.org/bulletin.html No.93 On the identity of Tsesevich’s “YY Dra” Taichi Kato and Elena P. Pavlenko No.94 Long-lasting standstill and fading episode in the IW And star V507 Cyg Taichi Kato andMasayuki Moriyama Seiichiro Kiyota VSOLJ

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[vsnet-chat 9006] ZTF J192517.70-051955.7: polar
by Taichi Kato 10 Mar '22

10 Mar '22

ZTF J192517.70-051955.7: polar https://www.aavso.org/vsx/index.php?view=detail.top&oid=1890324 It was already pointed out in http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-chat/8907 You seem to have forgotten to include polars reported in past vsnet-chat.

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vsnet-chat March 2022