February 2023 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9827] ASASSN-15cu possible superoutburst
by Taichi Kato 28 Feb '23

28 Feb '23

ASASSN-15cu possible superoutburst Likely eclipsing. YYYYMMDD(UT) mag observer 20230213.8500 19.292o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230213.8577 19.458o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230219.0751 19.097c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230219.0787 19.220c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230221.8495 16.046o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) … [View More]

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[vsnet-newvar 9826] SSSJ090619.2-275831
by Taichi Kato 28 Feb '23

28 Feb '23

SSSJ090619.2-275831 likely superoutburst (Likely SU UMa/ER UMa star) YYYYMMDD(UT) mag observer 20230221.6214 157C (Masayuki Moriyama) 20230224.6354 <160C (Masayuki Moriyama) 20230226.6103 16.01C (Masayuki Moriyama)

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[vsnet-newvar 9825] ASASSN-23ba: updated period of early superhumps
by Taichi Kato 27 Feb '23

27 Feb '23

ASASSN-23ba: updated period of early superhumps The data are from Berto Monard, Peter Starr, Josch Hambsch and Itoh-san. The period is 0.05662(1) d.

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[vsnet-newvar 9824] ASASSN-23aw: new SU UMa star
by Taichi Kato 27 Feb '23

27 Feb '23

ASASSN-23aw: new SU UMa star Using observations by Josch Hambsch, superhumps have developed since Feb. 23. The period is 0.0520(1) or 0.0549(1) d (rather difficult to determine due to the low sampling rate).

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[vsnet-newvar 9823] ASASSN-23ax: rebrightening
by Taichi Kato 27 Feb '23

27 Feb '23

ASASSN-23ax: rebrightening Josch Hambsch detected a rebrightening on Feb. 26 after a dip of 2-3 d.

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[vsnet-newvar 9822] Re: MASTER OT J055845.55+391533.4: new SU UMa-type dwarf nova
by Taichi Kato 25 Feb '23

25 Feb '23

Re: MASTER OT J055845.55+391533.4: new SU UMa-type dwarf nova > The resulting light curve clearly shows the presence of regular superhumps > (4 in total) with an amplitude of 0.20 mag, establishing MASTER OT > J055845.55+391533.4 as a new SU UMa-type dwarf nova. The object is unusual in that it almost regularly showed a deep dip during past outbursts. There were sometimes variations like oscillations after the dip, and the overall behavior resembles a double superoutburst. 2018 … [View More]

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[vsnet-newvar 9821] GDS J1145134-620057: IW And
by Taichi Kato 25 Feb '23

25 Feb '23

GDS J1145134-620057: IW And ATLAS: 15.8-18.2. IW And behavior in early 2023. Some hint in 2022.

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[vsnet-newvar 9820] GDS J1308184-633131: IW And
by Taichi Kato 25 Feb '23

25 Feb '23

GDS J1308184-633131: IW And ATLAS: 15.6-18.6. Long standstill + at least one terminal brightening.

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[vsnet-newvar 9819] GDS J1010438-582025: active dwarf nova
by Taichi Kato 25 Feb '23

25 Feb '23

GDS J1010438-582025: active dwarf nova ATLAS: 14.8-18.4. Frequent outbursts. SS Cyg? (Some outbursts resembles superoutbursts, but look like long outbursts of an SS Cyg star)

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[vsnet-newvar 9817] GDSJ0703457-063947: IW And star
by Taichi Kato 25 Feb '23

25 Feb '23

GDSJ0703457-063947: IW And star Using ATLAS forced photometry (Tonry et al. 2018; Shingles et al. 2021), this object turned out to be an IW And star (typical behavior in 2022). The variation was more heartbeat-like in 2020-2021, when the object was slightly brighter. This may be a suggestion of various IW And-type behavior depending on the mass-transfer rate.

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vsnet-newvar February 2023