May 2022 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9344] MGAB-V3549: eclipsing polar
by Taichi Kato 27 May '22

27 May '22

MGAB-V3549: eclipsing polar From ZTF data. Porb=0.0650694(1) d. Two maxima per period. 2.6 mag eclipse.

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[vsnet-newvar 9343] MGAB-V3749: polar
by Taichi Kato 27 May '22

27 May '22

MGAB-V3749: polar From ZTF data. Porb=0.0812865(1) d. Single maximum per period. High and low states.

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[vsnet-newvar 9342] MGAB-V3727: polar
by Taichi Kato 27 May '22

27 May '22

MGAB-V3727: polar From ZTF data. Porb=0.0789661(1) d. Single maximum per period. High and low states.

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[vsnet-newvar 9341] MGAB-V3654: IW And star
by Taichi Kato 27 May '22

27 May '22

MGAB-V3654: IW And star From ZTF data. IW And (typical) state in 2021.

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[vsnet-newvar 9340] MGAB-V359: more likely very unusual IP below the period minimum
by Taichi Kato 27 May '22

27 May '22

MGAB-V359: more likely very unusual IP below the period minimum I have analyzed thr ZTF data and confirmed the two periods found by G. Murawski. https://www.aavso.org/vsx/index.php?view=detail.top&oid=1498507 The amplitudes, however, are too large for an AM CVn star. The 0.0351788-d period has an amplitude of 1.5 mag. The 0.0239743-d period has an amplitude of 1.1 mag. The beat period of 0.0756893 d has to maxima per cycle. It is also unusual for an AM CVn star to have a secondary period much shorter than the orbital one. The profile of the light curve is boxy rather than sinusoidal (suggesting emission from magnetic poles). This object looks more likely an IP below the period minimum, but with polar-like large variations like Romanov V48 we suggested. See https://arxiv.org/abs/2204.02598 MGAB-V359 also has a bright ROSAT counterpart: 122016.2 +565454 (2000.0) 2RXP_J122016.3+565455 0.2251P -0.81 -0.41 931030 122016.4 +565451 (2000.0) 1RXPJ122016+5654.8 0.2160 -0.81 -0.43

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[vsnet-newvar 9339] ASASSN-22hc
by Taichi Kato 27 May '22

27 May '22

ASASSN-22hc ASASSN-22hc --- ------- 8:20:29.11 -20:14:15.6 2022-05-22.03 13.71 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=20.8, g>17.6 on 2022-05-20.03, g=14.0 on 2022-05-22.03, g=14.0 on 2022-05-23.02. ASASSN-22hc 20220520.03 <176g ASN ASASSN-22hc 20220522.03 140g ASN ASASSN-22hc 20220523.02 140g ASN

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[vsnet-newvar 9338] ASASSN-14bp likely superoutburst
by Taichi Kato 24 May '22

24 May '22

ASASSN-14bp likely superoutburst YYYYMMDD(UT) mag observer 20220503.4812 <140c (Yutaka Maeda) 20220504.6941 <147C (Masayuki Moriyama) 20220507.4672 <148c (Yutaka Maeda) 20220523.594 143 (Rod Stubbings)

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[vsnet-newvar 9337] XM116HT: ordinary superhumps
by Taichi Kato 23 May '22

23 May '22

XM116HT: ordinary superhumps According to observations by Tamas Tordai on May 22-23, ordinary superhumps were present. They were not apparent a day before.

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[vsnet-newvar 9336] ASASSN-13at superoutburst
by Taichi Kato 23 May '22

23 May '22

ASASSN-13at superoutburst YYYYMMDD(UT) mag observer 20220511.3625 20.186zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220511.4506 19.763zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220514.7069 <158c (Yutaka Maeda) 20220517.6892 <160c (Yutaka Maeda) 20220517.7838 <167C (Masayuki Moriyama) 20220518.6355 141C (Masayuki Moriyama) 20220518.6895 140cG (Yutaka Maeda) 20220518.6896 140cG (Yutaka Maeda) 20220520.1740 14.07C (Masao Funada) 20220521.6647 140cG (Yutaka Maeda)

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[vsnet-newvar 9335] ASASSN-20pv: still bright (AM CVn)
by Taichi Kato 23 May '22

23 May '22

ASASSN-20pv: still bright (AM CVn) YYYYMMDD(UT) mag observer 20220422.0026 14.835g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.0038 15.042g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2409 15.492g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2422 15.322g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2436 15.395g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.606 143 (Rod Stubbings) 20220423.2442 15.314g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.2455 15.455g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.2468 15.419g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.2435 15.497g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.592 144 (Rod Stubbings) 20220425.376 154 (Rod Stubbings) 20220425.592 143 (Rod Stubbings) 20220425.624 144 (Rod Stubbings) 20220428.560 143 (Rod Stubbings) 20220502.610 143 (Rod Stubbings) 20220502.682 143 (Rod Stubbings) 20220503.591 143 (Rod Stubbings) 20220505.562 143 (Rod Stubbings) 20220505.635 144 (Rod Stubbings) 20220505.701 144 (Rod Stubbings) 20220509.599 144 (Rod Stubbings) 20220520.571 144 (Rod Stubbings) 20220521.633 144 (Rod Stubbings) 20220522.553 144 (Rod Stubbings)

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vsnet-newvar May 2022