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[vsnet-chat 8813] MGAB-V439: Z Cam star
by Taichi Kato 02 Sep '21

02 Sep '21

MGAB-V439: Z Cam star From ZTF data. Standstill in 2020 Nov.-2021 Apr.

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[vsnet-chat 8812] MGAB-V432: orbital period
by Taichi Kato 02 Sep '21

02 Sep '21

MGAB-V432: orbital period From ZTF data. Porb=0.1844186(3) d. UGSS+E.

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[vsnet-chat 8811] MGAB-V390: deeply eclipsing, low-amplitude dwarf nova
by Taichi Kato 02 Sep '21

02 Sep '21

MGAB-V390: deeply eclipsing, low-amplitude dwarf nova From ZTF data. Porb=0.1553445(2) d. Eclipse nearly 3.0 mag. Low-amplitude SS Cyg-type dwarf nova (as of now, standstill may be expected).

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[vsnet-chat 8810] ZTF18aaxyrpd: VY Scl+E
by Taichi Kato 02 Sep '21

02 Sep '21

ZTF18aaxyrpd: VY Scl+E According to ZTF data, Porb = 0.1292706(1) with 0.4 mag eclipses. Faint state in 2019 Aug.-Sep.

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[vsnet-chat 8809] ZTF18aaxyrpd: IW And star
by Taichi Kato 02 Sep '21

02 Sep '21

ZTF18aaxyrpd: IW And star According to ZTF data, this object is a typical IW And star (pattern well visible in the 2020 data).

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[vsnet-chat 8808] ZTF18acullhv: possible AM CVn star
by Taichi Kato 02 Sep '21

02 Sep '21

ZTF18acullhv: possible AM CVn star According to ZTF data, this object showed complex outbursts similar to AM CVn-type superoutbursts. 064321.2 -234008 (2000.0) Gaia_DR2_2925381050846472192 group_C4 g=16.742(0.543) Mowlavi2020 064321.279 -234008.94 (2000.0) Gaia_DR2_2925381050846472064 plx=-(-) dismod=- pmra=-(-) pmdec=-(-) G=16.742 BP=16.680 RP=16.692 064321.280 -234008.96 (2000.0) Gaia_EDR3_2925381050848348288 plx=1.868(0.088) dismod=8.6 pmra=17.795(0.054) pmdec=-33.375(0.077) G=18.596 BP=18.550 RP=18.445 Blue and low-luminosity (M_V = +6.3 at max), consistent with the AM CVn-type classification. This object is bright (15 mag at max) and further observations to search for superhumps and spectroscopy are desirable.

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[vsnet-chat 8807] ZTF18abjgdkx: deeply eclipsing likely IW And star
by Taichi Kato 02 Sep '21

02 Sep '21

ZTF18abjgdkx: deeply eclipsing likely IW And star According to ZTF data, this object shows deep (1.2 mag) eclipses. The period is 0.2108865(4) d. The overall light curve suggests an IW And star (particularly in 2020).

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[vsnet-chat 8806] RX J0153.3+7446: VY Scl star
by Taichi Kato 31 Aug '21

31 Aug '21

RX J0153.3+7446: VY Scl star Deep fading since 2020 Oct. in ZTF data. Now around mag 19 or even fainter.

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[vsnet-chat 8805]V841 Aql
by Taichi Kato 27 Aug '21

27 Aug '21

V841 Aql https://www.aavso.org/vsx/index.php?view=detail.top&oid=1980 Uncertain identification. Photometry (V= 19.7; V-J= 7.8) is for the red star IPHAS J190740.03+102945.5 (g-r= 2.9; J-K= 2.45; BP-RP= 7.02). The GCVS (version Nov. 2020) and the Downes catalogue identify the nova as the bluer star IPHAS J190739.84+102943.2 (g= 20.2; g-r= 1.0), which is 4" to the SW. This object is also classified as variable in 2021A&A...648A..44M and was also detected as a transient by ZTF (ZTF19abciwnk). The finding chart in 1987SSRv...45....1D does not have enough resolution to solve the two candidates. The bluer star is likely the true nova. 190739.846 +102943.22 (2000.0) Gaia_DR2_4312316597388130304 plx=0.374(0.455) dismod=12.1 pmra=-5.118(0.673) pmdec=-6.103(0.706) G=19.192 BP=19.734 RP=18.083 190739.846 +102943.22 (2000.0) Gaia_EDR3_4312316597388130304 plx=0.489(0.301) dismod=11.6 pmra=-4.266(0.283) pmdec=-5.876(0.286) G=19.169 BP=19.893 RP=18.195 The ZTF data showed a dwarf nova-like phase in 2019 June-Aug. Time-resolved data on 2018 Aug. 4 showed some degree of flickering. This is most likely the CV.

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[vsnet-chat 8803]VSOLJ bulletin
by meineko 26 Aug '21

26 Aug '21

Following VSOLJ bulletin are now available at http://vsolj.cetus-net.org/bulletin.html No.79 2021 Aug. MP Gem: VY Scl-type star, finally Taichi Kato No.80 2021 Aug. ASASSN-V J205543.90+240033.5: another white dwarf pulsar? Taichi Kato Seiichiro Kiyota, VSOLJ

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