- vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 26671] MASTER OT J021216.01+461154.5 possible superoutburst
by Taichi Kato 18 Mar '22

18 Mar '22

MASTER OT J021216.01+461154.5 possible superoutburst Type from ZTF data. Supercycle about 800 d. YYYYMMDD(UT) mag observer 20220306.4731 <153c (Yutaka Maeda) 20220307.469 <174C (Mitsutaka Hiraga) 20220307.4768 <150c (Yutaka Maeda) 20220308.465 <174C (Mitsutaka Hiraga) 20220308.4765 <155c (Yutaka Maeda) 20220309.4784 <152c (Yutaka Maeda) 20220311.4562 <155c (Yutaka Maeda) 20220312.4537 <154c (Yutaka Maeda) 20220315.4640 139cG (Yutaka Maeda) 20220316.4602 138cG (Yutaka Maeda) 20220316.5197 140:C (Masayuki Moriyama)

1 0

[vsnet-alert 26670] Re: ASASSN-22dl: new WZ Sge-type dwarf nova with large-amplitude early superhumps
by Taichi Kato 17 Mar '22

17 Mar '22

Re: ASASSN-22dl: new WZ Sge-type dwarf nova with large-amplitude early superhumps Using the ZTF data, I obtained Min(BJD) = 2458713.27415(12) + 0.05561039(3) d This is a deeply eclipsing WZ Sge-type object whose eclipse minima were below the detection limit of the ZTF observations. Orbital humps before the eclipses were also apparent, suggesting that the mass-transfer rate is not very low. The period of early superhumps (but still from a short baseline) is shorter than the orbital period by 0.13%, typical for a WZ Sge star. Tampo-san and Sebastian, please be careful about in drawing the conclusion. The ZTF data also have one-day aliases.

1 0

[vsnet-alert 26669] Re: ASASSN-22dl: new WZ Sge-type dwarf nova with large-amplitude early superhumps
by Taichi Kato 17 Mar '22

17 Mar '22

Re: ASASSN-22dl: new WZ Sge-type dwarf nova with large-amplitude early superhumps I obtained a period of 0.0561(3) d from Kyoto U. data alone (very good data). The combined set with Itoh-san's data yielded a period of 0.05554(2) d. It looks like that the longer period is the true one.

1 0

[vsnet-alert 26668] ASASSN-22dl: new WZ Sge-type dwarf nova with large-amplitude early superhumps
by 反保雄介 16 Mar '22

16 Mar '22

ASASSN-22dl: new WZ Sge-type dwarf nova with large-amplitude early superhumps Kyoto Univ. team observed ASASSN-22dl on 16th March. Combining with the data from Itoh-san on 15th, we obtained the double-peaked variation with the period of 0.05259(2) or 0.05555(2) d (alias) and the mean amplitude of 0.5 mag. Judging from its period and phase-averaged profile, I conclude that ASASSN-22dl is a new WZ Sge-type dwarf nova with a large amplitude early superhump. Also, the quiescence data of ZTF showed a possible variation with the period of 0.052673(1) d and with the double-peaked profile. Further observations are encouraged! Best, Yusuke 2022年3月16日(水) 8:55 Taichi Kato <tkato(a)kusastro.kyoto-u.ac.jp>: > ASASSN-22dl: superhump or early superhump? > > Itoh-san detected large variations up to 0.8 mag. > There were two maxima in one cycle and the profile > suggest either an early superhump or superhump + eclipse. > The period was around 0.054 d. Further observations > are encouraged. > -- ---------------------------------------------- Kyoto University, Graduate School of Department of Astronomy, PhD student Yusuke TAMPO MAIL: tampo(a)kusastro.kyoto-u.ac.jp ----------------------------------------------

1 0

[vsnet-alert 26667] ASASSN-22dl: superhump or early superhump?
by Taichi Kato 15 Mar '22

15 Mar '22

ASASSN-22dl: superhump or early superhump? Itoh-san detected large variations up to 0.8 mag. There were two maxima in one cycle and the profile suggest either an early superhump or superhump + eclipse. The period was around 0.054 d. Further observations are encouraged.

1 0

[vsnet-alert 26653] ASASSN-19hd rare outburst
by Taichi Kato 15 Mar '22

15 Mar '22

ASASSN-19hd rare outburst SU UMa star? YYYYMMDD(UT) mag observer 20220305.5545 <170c (Yutaka Maeda) 20220306.5578 <154c (Yutaka Maeda) 20220307.5619 <165c (Yutaka Maeda) 20220308.5617 <162c (Yutaka Maeda) 20220309.5636 <160c (Yutaka Maeda) 20220310.5563 146:c (Yutaka Maeda)

3 2

[vsnet-alert 26654] AB Nor likely superoutburst
by Taichi Kato 14 Mar '22

14 Mar '22

AB Nor likely superoutburst YYYYMMDD(UT) mag observer 20220311.3231 13.69C (Masao Funada)

4 4

[vsnet-alert 26663] BMAM-V547: VY Scl star currently in low state
by Taichi Kato 14 Mar '22

14 Mar '22

BMAM-V547: VY Scl star currently in low state ASAS-SN data: https://asas-sn.osu.edu/sky-patrol/coordinate/1c81a2ee-0aa0-4a8d-a4c0-b8d07…

1 0

[vsnet-alert 26662] CSS J062450.1+503114: superhump period
by Taichi Kato 13 Mar '22

13 Mar '22

CSS J062450.1+503114: superhump period Itoh-san and Josch Hambsch have reported observations. Well-defined superhumps have been observed and the period has been established to be 0.07768(2) d. The mean amplitude is 0.19 mag.

1 0

[vsnet-alert 26646] GK Per rising
by Taichi Kato 12 Mar '22

12 Mar '22

GK Per rising Maeda-san has pointed out that GK Per is rising. > PERGK 20220309.4908912 125cG Mdy.VSOLJ rising#

5 6