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

[vsnet-alert 26533] EX Hya outburst (since Jan. 8): rebrightening on Jan. 14
by Patrick Schmeer 20 Jan '22

20 Jan '22

EX Hydrae (UG+NLDQ+E) Intermediate polar, eclipsing, orbital period: 0.068234 d (98.257 min) From "activity at a glance (Jan 16)" (T. Kato, vsnet-outburst 28234): 20220103.7814 133:cG (Yutaka Maeda) 20220107.8029 130:cG (Yutaka Maeda) 20220107.853 132 (Hiroyuki Maehara) 20220108.867 100 (Hiroyuki Maehara) 20220109.581 98 (Rod Stubbings) 20220109.7724 107cG (Yutaka Maeda) 20220109.7724 107cG (Yutaka Maeda) 20220111.585 128 (Rod Stubbings) 20220111.862 126 (Hiroyuki Maehara) 20220115.853 118 (Hiroyuki Maehara) Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/3952b0d4-b5a1-4d54-bdda-c209b… HYAEX 20220106.3562 13.19g ASN HYAEX 20220110.2402 11.14g ASN HYAEX 20220111.5182 13.02g ASN HYAEX 20220113.0232 12.75g ASN HYAEX 20220114.0460 11.57g ASN Precursor outburst followed by a superoutburst? However, in this case the precursor outburst would have been much brighter than the superoutburst. Time-resolved photometry is urgently required. Clear skies, Patrick

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[vsnet-alert 26532] RZ Leo: started to show ordinary superhumps?
by 反保雄介 18 Jan '22

18 Jan '22

RZ Leo: started to show ordinary superhumps? Tamás Tordai and Kyoto Univ. Obs. have reported further observations of RZ Leo. The data on 15th Jan at Kyoto Univ. Obs. showed a large amplitude (~0.3 mag) variation, which has a significantly larger amplitude of its early superhumps (see vsnet-alert 26529). Time-resolved observations are strongly encouraged to examine its superhump evolution. Best, Yusuke

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[vsnet-alert 26530] ASASSN-22as
by Taichi Kato 15 Jan '22

15 Jan '22

ASASSN-22as ASASSN-22as --- ------- 15:17:56.64 45:38:33.1 2022-01-13.62 14.52 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=22.1, g>18.6 on 2022-01-07.59, g=14.1 on 2022-01-10.62, g=14.8 on 2022-01-13.62 ASASSN-22as 20220107.59 <186g ASN ASASSN-22as 20220110.62 141g ASN ASASSN-22as 20220113.62 148g ASN 151756.233 +453832.77 (2000.0) GALEX_DR5_6374962000150138599 NUV=22.280(0.412) FUV=-(-)

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[vsnet-alert 26529] RZ Leo: early superhumps
by Taichi Kato 15 Jan '22

15 Jan '22

RZ Leo: early superhumps Kiyota-san and Itoh-san have reported observations. The object now clearly show 0.09-mag early superhumps. The period was 0.07578(4) d, not positive superhumps. Porb=0.076038 d. WZ Sge stars with this Porb are very rare.

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[vsnet-alert 26528] ASASSN-22ae is a ugsu type DN
by Berto Monard 14 Jan '22

14 Jan '22

ASASSN-22ae was reported as an object with an outburst amplitude of 3.2 mag on Jan 15. Observations over 4 nights in the period Jan 7 to Jan 13 at CBA KKO, confirm ASASSN-22ae as a ugsu type dwarf nova, showing superhumps of amplitude 0.2CR with a period of 0.06883d +/- 0.00004d. The brightness on Jan 13.9 was around 14.7CR. Berto Monard / CBA KKO Calitzdorp, South Africa

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[vsnet-alert 26527] Re: ASASSN-22an is a dwarf nova
by Taichi Kato 14 Jan '22

14 Jan '22

Re: ASASSN-22an is a dwarf nova Interesting result. The object was bright in 2021 Oct. and it would be difficult to imagine that a dwarf nova outburst last nearly three months (unless they were separate outbursts), and it is still disk-dominated.

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[vsnet-alert 26526] RZ Leo: short-term variations
by Taichi Kato 14 Jan '22

14 Jan '22

RZ Leo: short-term variations Itoh-san reported observations. The object showed variations and they may have been early superhumps. Observation are encouraged.

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[vsnet-alert 26522] RZ Leo outburst
by Hiroyuki Maehara 14 Jan '22

14 Jan '22

According to Kojima-san, RZ Leo is in outburst. object YYYYMMDD(UT) mag code LEORZ 20220112.791 136c TKo Observer: Tadashi Kojima (Gunma, Japan) Instruments: f.l.=200mm lens + Canon EOS 6D

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[vsnet-alert 26524] ASASSN-22an is a dwarf nova
by Kirill Sokolovsky 13 Jan '22

13 Jan '22

We obtained a medium-resolution spectrum of ASASSN-22an with the 4.1m SOAR telescope and Goodman spectrograph on 2022-01-11 08:31 UT. The spectrum covering 3900-7900 A shows a continuum with superimposed broad Balmer absorption lines. The Halpha shows a narrow emission component on top of the broad absorption. The spectrum is that of a dwarf nova in outburst, not consistent with a classical nova. We also used the SOAR acquisition images to measure the astrometric position of ASASSN-22an relative to the few UCAC3 stars in the field: 15:24:49.52 -57:39:52.8 +/-0.1" J2000 There is no Gaia EDR3 source at this position, but USNO-B1.0 0323-0738701 (R1mag=19.8, Imag=18.4) is located only 0.2" away. A faint (median DECaPS DR1 magnitudes g=23.1, r=22.8) source is visible in DECaPS images 0.3" from the SOAR position. AAVSO VSX record for ASASSN-22an: https://www.aavso.org/vsx/index.php?view=detail.top&oid=2225890 Kirill Sokolovsky, Adam Kawash, Elias Aydi, Jay Strader

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[vsnet-alert 26521] ASASSN-22ao
by Taichi Kato 11 Jan '22

11 Jan '22

ASASSN-22ao ASASSN-22ao --- ------- 23:16:36.34 50:1:52.2 2022-01-9.11 15.42 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=20.0, g>17.4 on 2021-12-14.16, g=17.1 on 2022-01-07.21, g=15.8 on 2022-01-09.11 ASASSN-22ao 20211214.16 <174g ASN ASASSN-22ao 20220107.21 171g ASN ASASSN-22ao 20220109.11 158g ASN 2MASS 231636.315 +500152.31 (2000.0) 16.293 15.671 16.463 231636.274 +500152.27 (2000.0) Gaia_DR2_1990859453575783680 plx=0.274(0.385) dismod=12.8 pmra=-11.457(0.599) pmdec=-11.396(0.534) G=19.625 BP=19.780 RP=19.140 231636.273 +500152.27 (2000.0) Gaia_EDR3_1990859453575783680 plx=0.566(0.298) dismod=11.2 pmra=-11.471(0.288) pmdec=-10.445(0.254) G=19.612 BP=19.880 RP=19.152 Double outburst in 2018 June-July in ZTF data.

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