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[vsnet-alert 26397] V606 Vul rapid fading: more complete data set
by Taichi Kato 09 Nov '21

09 Nov '21

V606 Vul rapid fading: more complete data set YYYYMMDD(UT) mag observer 20211031.506 119 (Hiroyuki Maehara) 20211031.7556 123 (Eddy Muyllaert) 20211101.3590 10.878Rc (Yasuo Sano) 20211101.3595 12.989B (Yasuo Sano) 20211101.3597 12.113V (Yasuo Sano) 20211101.3603 10.802C (Yasuo Sano) 20211101.6277 122V (Masayuki Moriyama) 20211101.6318 118C (Masayuki Moriyama) 20211101.7514 120 (Eddy Muyllaert) 20211101.962 119 (Gary Poyner) 20211102.433 128 (Takuichiro Onishi) 20211102.474 124 (Yoshiyasu Sato) 20211102.6065 12.73V (Masayuki Moriyama) 20211102.7576 124 (Eddy Muyllaert) 20211102.850 124 (Gary Poyner) 20211103.431 122 (Takuichiro Onishi) 20211103.494 124 (Yoshiyasu Sato) 20211103.6018 12.20V (Masayuki Moriyama) 20211104.408 132 (Takuichiro Onishi) 20211104.5663 136V (Masayuki Moriyama) 20211104.750 124 (Gary Poyner) 20211105.3628 10.930Rc (Yasuo Sano) 20211105.428 122 (Yoshiyasu Sato) 20211105.4457 12.979B (Yasuo Sano) 20211105.4459 12.169V (Yasuo Sano) 20211105.4464 11.025C (Yasuo Sano) 20211105.7514 123 (Eddy Muyllaert) 20211106.4210 13.09V (Minoru Sato) 20211106.5764 13.69V (Masayuki Moriyama) 20211106.5781 12.58Rc (Masayuki Moriyama) 20211106.5796 11.90Ic (Masayuki Moriyama) 20211106.5991 <14.51B (Masayuki Moriyama) 20211107.3990 15.152B (Yasuo Sano) 20211107.3998 12.872C (Yasuo Sano) 20211107.4003 14.282V (Yasuo Sano) 20211107.4006 12.565Rc (Yasuo Sano) 20211107.419 <143 (Takuichiro Onishi) 20211107.492 143 (Hiroyuki Maehara)

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[vsnet-alert 26338] 1RXS J063214.8+253620 (UG) first outburst since 2012
by Kirill Sokolovsky 08 Nov '21

08 Nov '21

Hi, The dwarf nova 1RXS J063214.8+253620 was found in outburst on the NMW survey images (135mm f/2.0 lens + unfiltered ST-8300M CCD): YYYYMMDD.D(UT) mag 20211020.9384 12.6CV The ASAS-SN lightcurve https://asas-sn.osu.edu/sky-patrol/coordinate/7272c442-c9b2-4ec3-b8a8-9780a… suggests the outburst started on 2021-10-19 and this is the first outburst since the discovery of this dwarf nova in 2012. The ASAS-SN data also suggest the presence of periodic modulation in minimum light. The quiescent K2 lightcurve of 1RXS J063214.8+253620 was modeled by https://ui.adsabs.harvard.edu/abs/2018AJ....156..153D/abstract VSX record for 1RXS J063214.8+253620: https://www.aavso.org/vsx/index.php?view=detail.top&oid=276839 Some of the previous messages on vsnet-alert discussing the 2012 outburst: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/14158 http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/14171 http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/14172 Best wishes, Kirill Sokolovsky, Stanislav Korotkiy, Olga Smolyankina

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[vsnet-alert 26395] Re: V606 Vul rapid fading
by Taichi Kato 08 Nov '21

08 Nov '21

Re: V606 Vul rapid fading 20211104.408 132 (Takuichiro Onishi) 20211104.750 124 (Gary Poyner) 20211105.7514 123 (Eddy Muyllaert) 20211107.492 143 (Hiroyuki Maehara) The object had already faded to V=13.6 on Nov. 4.

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[vsnet-alert 26394] V606 Vul rapid fading
by Taichi Kato 08 Nov '21

08 Nov '21

V606 Vul rapid fading YYYYMMDD(UT) mag observer 20211101.6277 122V (Masayuki Moriyama) 20211101.6318 118C (Masayuki Moriyama) 20211101.7514 120 (Eddy Muyllaert) 20211101.962 119 (Gary Poyner) 20211102.433 128 (Takuichiro Onishi) 20211102.474 124 (Yoshiyasu Sato) 20211102.6065 12.73V (Masayuki Moriyama) 20211102.7576 124 (Eddy Muyllaert) 20211102.850 124 (Gary Poyner) 20211103.431 122 (Takuichiro Onishi) 20211103.494 124 (Yoshiyasu Sato) 20211103.6018 12.20V (Masayuki Moriyama) 20211104.408 132 (Takuichiro Onishi) 20211104.750 124 (Gary Poyner) 20211105.7514 123 (Eddy Muyllaert) 20211107.492 143 (Hiroyuki Maehara)

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[vsnet-alert 26390] TCP J07363658+4151215: most likely helium WZ Sge-type dwarf nova
by Taichi Kato 06 Nov '21

06 Nov '21

TCP J07363658+4151215: most likely helium WZ Sge-type dwarf nova Kyoto U. team has reported observations. The data show early superhumps with an amplitudes of 0.05 mag. The period is 0.0280(2) d. This object is most likely a helium WZ Sge star. The SDSS color (very blue u-g=+0.27) is consistent.

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[vsnet-alert 26388] PV Per superoutburst
by Taichi Kato 04 Nov '21

04 Nov '21

PV Per superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20211028.6856 <146c (Yutaka Maeda) 20211029.6982 <148c (Yutaka Maeda) 20211030.928 <152 (Gary Poyner) 20211031.6835 <163c (Yutaka Maeda) 20211101.6974 155:cG (Yutaka Maeda) 20211102.6710 151c (Yutaka Maeda) 20211103.2152 14.928zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26387] MGAB-V320 likely superoutburst
by Taichi Kato 04 Nov '21

04 Nov '21

MGAB-V320 likely superoutburst Type from ZTF data. Object with a short supercycle. YYYYMMDD(UT) mag observer 20211103.1168 15.884zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211103.1449 15.966zr (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26386] Gaia16bvm likely superoutburst
by Taichi Kato 04 Nov '21

04 Nov '21

Gaia16bvm likely superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20211103.1149 16.919zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26385] Fw: [vsnet-adm 210582] planetary hypothesis for O-C variations of CVs and PCEBs
by Daisaku NOGAMI 03 Nov '21

03 Nov '21

Dear colleagues, I would forward a request e-mail from Prof. Klaus Beuermann. Best regards, Daisaku Nogami --- Daisaku NOGAMI <nogami(a)kusastro.kyoto-u.ac.jp> Begin forwarded message: Date: Tue, 2 Nov 2021 08:58:45 +0100 From: Klaus Beuermann <k.beuermann(a)t-online.de> To: vsnet-ecl-owner(a)ooruri.kusastro.kyoto-u.ac.jp Subject: [vsnet-adm 210582] planetary hypothesis for O-C variations of CVs and PCEBs Dear colleagues, I am working on the cause of the substantial O-C variations in cataclysmic variables and post-common-envelope binaries. I am sure, you have observations of at least some of the objects, we are following up and I wounder, how I can access such data of yours, which requires to search for an object by name or coordinates. Currently I am interested in HU Aqr, NN Ser, HW Vir, QS Vir, V470 Cam=HS0705+66, CSS080502, CSS06653, CSS041631 WD1333, . . . Would your group be able to provide eclipse data (raw light curves or mid eclipse times) on such objects? Thanks in advance______ Klaus Beuermann Institute for Astrophysics (formerly Goettingen Observatory), Goettingen, Germany

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[vsnet-alert 26384] Gaia21efs further brightening
by Taichi Kato 03 Nov '21

03 Nov '21

Gaia21efs further brightening Tonny Vanmunster has reported further observations. The object further brightened to 12.6-12.7 mag on Oct. 31. There were short-period modulations and even a period of 0.054 d is suspected. More data are definitely needed to clarify the nature of this object.

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