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

[vsnet-chat 9036] DDE 37: polar
by Taichi Kato 30 Mar '22

30 Mar '22

DDE 37: polar From ZTF data. Porb = 0.0731854(4) d. Low and high states. Stronger and weaker poles.

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[vsnet-chat 9035] 1RXS J234500.2+342913: eclipsing polar
by Taichi Kato 30 Mar '22

30 Mar '22

1RXS J234500.2+342913: eclipsing polar From ZTF data. Porb = 0.1300449(4) d. Eclipses are more than 2 mag deep.

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[vsnet-chat 9034] RX J2133.7+5107: VY Scl star
by Taichi Kato 30 Mar '22

30 Mar '22

RX J2133.7+5107: VY Scl star From ZTF data. Faint states in 2020 Apr. and 2021 Apr. Small outbursts late in 2020 (suggestion of an IW And star?).

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[vsnet-chat 9033] Karachurin14: Z Cam + VY Scl
by Taichi Kato 29 Mar '22

29 Mar '22

Karachurin14: Z Cam + VY Scl ASAS-SN data: https://asas-sn.osu.edu/sky-patrol/coordinate/c6f8014a-9a0f-498c-8fa6-8a941…

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[vsnet-chat 9032] LAMOSTJ051254.04+310239.2: IW And star
by Taichi Kato 29 Mar '22

29 Mar '22

LAMOSTJ051254.04+310239.2: IW And star From ZTF data. IW And phenomena since the end of 2019.

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[vsnet-chat 9031] LAMOSTJ024621.48+271053.3: period
by Taichi Kato 29 Mar '22

29 Mar '22

LAMOSTJ024621.48+271053.3: period Using the ZTF data, I obtained a period of 0.150379(3) d. Nearly sinusoidal and amplitude 0.10 mag.

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[vsnet-chat 9030] KLK-32: basically R+E with variation outside eclipses
by Taichi Kato 29 Mar '22

29 Mar '22

KLK-32: basically R+E with variation outside eclipses From ZTF data. Min.BJD = 2458639.8526(1) + 0.0895242(2) E Brightness outside eclipses vary (sometimes bright up to 1 mag as on 2018 July 6).

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[vsnet-chat 9029] VSOLJ Variable Star Bulletin No.97
by meineko 26 Mar '22

26 Mar '22

VSOLJ Variable Star Bulletin No.97VSOLJ Variable Star Bulletin No.97 is available at http://vsolj.cetus-net.org/bulletin.html No.97 Gaia22ayj: outburst from a deeply eclipsing 9.36-min binary? Taichi Kato ----------------- Seiichiro Kiyota VSOLJ

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[vsnet-chat 9028] EW Hya (UG) and NSV19451
by Taichi Kato 25 Mar '22

25 Mar '22

EW Hya (UG) and NSV19451 EW Hya is an UG star. ASAS-SN data: https://asas-sn.osu.edu/sky-patrol/coordinate/635c2114-d4d3-4c00-b6b3-b1718… Several outbursts were recorded. 124005.624 -302818.49 (2000.0) Gaia_DR2_3470701018210385664 plx=1.335(0.592) dismod=9.4 pmra=-12.531(1.507) pmdec=-4.957(0.835) G=20.001 BP=20.068 RP=19.540 124005.624 -302818.49 (2000.0) Gaia_EDR3_3470701018210385664 plx=1.284(0.409) dismod=9.5 pmra=-12.695(0.523) pmdec=-5.659(0.284) G=19.835 BP=19.888 RP=19.458 124005.635 -302818.63 (2000.0) GALEX_DR5_6386854346909290646 NUV=19.967(0.100) FUV=20.152(0.245) NSV19451 https://istina.msu.ru/media/publications/article/4bb/965/2459689/ats1252.pdf According to this, the author noted a variable star near the position of EW Hya. The author was not sure about the identity with EW Hya because the recorded magnitude was much fainter than EW Hya. The author noted that UG type is not excluded. Considering the ASAS-3 behavior and magnitude, Kolevatykh indeed observed the UG star EW Hya and there is no other variable. NSV19451 = EW Hya. The 14th mag star (currently identified as NSV19451) is constant in ASAS-3: https://asas-sn.osu.edu/sky-patrol/coordinate/202e2dd6-426c-4e51-a315-97d55…

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[vsnet-chat 9027] ASASSN-21ob: dwarf nova below the period gap with strong ellipsoidal variation
by Taichi Kato 18 Mar '22

18 Mar '22

ASASSN-21ob: dwarf nova below the period gap with strong ellipsoidal variation From ZTF data. Porb = 0.0769268(3) d. Double-wave modulation (ellipsoidal variation). Total amplitude 0.14 mag. Too red for this Porb and the secondary may be evolved. Although genuine superoutburst has not been recorded, it is expected.

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