[vsnet-alert 22163] Re: ATLAS18olb - 13.1m dwarf nova in Lyra

[Robin Leadbeater]

Low resolution (R~530) spectrum 2018-05-14.954 showing blue continuum and 
weak broad H Balmer lines in absorption

http://www.spectro-aras.com/forum/viewtopic.php?f=5&t=2023

Robin

-----Original Message----- 
From: Denis Denisenko d.v.denisenko at gmail.com via vsnet-alert
Sent: Tuesday, May 15, 2018 9:34 AM
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 22162] ATLAS18olb - 13.1m dwarf nova in Lyra

ATLAS system on Hawaii (0.5-m f/2.0 reflector + 10.5x10.5k CCD) has
discovered an outburst of the blue star in Lyra.

ATLAS18olb
  20180511.619  <190o   ATLAS (J. Tonry et al., 2018)
  20180512.552  14.92o  ATLAS

ATLAS18olb = AT 2018blk
https://wis-tns.weizmann.ac.il/object/2018blk

The object has further brightened to 13.1m on iTelescope T05 images at
07:55-08:01 UT on May 15th.

  20180515.331  13.15CV  iTelescope T05
  20180515.335  13.14CV  iTelescope T05

Nearby star GSC 03118-00982 with TASS V=13.43 magnitude was used a 
fererence.
Color-combined DSS finder chart:
http://scan.sai.msu.ru/~denis/ATLAS18olb-BRIR.jpg

The new variable at quiescence is identical to USNO-B1.0 1278-0372711
18 41 51.06 +37 52 29.2  pmRA=-10 pmDE=-24 B1=20.24 R1=19.55 B2=20.54
R2=20.11 I=N/A

The object was included in Kepler Input Catalog as KIC 2540648.

Gaia position: 18 41 51.065 +37 52 28.97
pmRA=-11.2+/-1.4 pmDE=-18.4+/-1.8 mas/yr Gmag=20.59+/-0.01

PanSTARRS grizy magnitudes:
g=20.49+/-0.04 r=20.51+/-0.04 i=20.67+/-0.02 z=20.46+/-0.07 y=20.33+/-0.14

Thus, the outburst amplitude is about 7 magnitudes. Time-resolved
photometry is encouraged.

Denis Denisenko 


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