vsnet-chat August 2021

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[vsnet-chat 8806] RX J0153.3+7446: VY Scl star
by Taichi Kato 31 Aug '21

31 Aug '21

RX J0153.3+7446: VY Scl star Deep fading since 2020 Oct. in ZTF data. Now around mag 19 or even fainter.

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[vsnet-chat 8805]V841 Aql
by Taichi Kato 27 Aug '21

27 Aug '21

V841 Aql https://www.aavso.org/vsx/index.php?view=detail.top&oid=1980 Uncertain identification. Photometry (V= 19.7; V-J= 7.8) is for the red star IPHAS J190740.03+102945.5 (g-r= 2.9; J-K= 2.45; BP-RP= 7.02). The GCVS (version Nov. 2020) and the Downes catalogue identify the nova as the bluer star IPHAS J190739.84+102943.2 (g= 20.2; g-r= 1.0), which is 4" to the SW. This object is also classified as variable in 2021A&A...648A..44M and was also detected as a transient by ZTF (ZTF19abciwnk). The finding chart in 1987SSRv...45....1D does not have enough resolution to solve the two candidates. The bluer star is likely the true nova. 190739.846 +102943.22 (2000.0) Gaia_DR2_4312316597388130304 plx=0.374(0.455) dismod=12.1 pmra=-5.118(0.673) pmdec=-6.103(0.706) G=19.192 BP=19.734 RP=18.083 190739.846 +102943.22 (2000.0) Gaia_EDR3_4312316597388130304 plx=0.489(0.301) dismod=11.6 pmra=-4.266(0.283) pmdec=-5.876(0.286) G=19.169 BP=19.893 RP=18.195 The ZTF data showed a dwarf nova-like phase in 2019 June-Aug. Time-resolved data on 2018 Aug. 4 showed some degree of flickering. This is most likely the CV.

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[vsnet-chat 8803]VSOLJ bulletin
by meineko 26 Aug '21

26 Aug '21

Following VSOLJ bulletin are now available at http://vsolj.cetus-net.org/bulletin.html No.79 2021 Aug. MP Gem: VY Scl-type star, finally Taichi Kato No.80 2021 Aug. ASASSN-V J205543.90+240033.5: another white dwarf pulsar? Taichi Kato Seiichiro Kiyota, VSOLJ

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vsnet-chat August 2021