[vsnet-alert 22093] Gaia18azl = ASASSN-V J203148.85+403800.1

[Taichi Kato]

Gaia18azl = ASASSN-V J203148.85+403800.1

   (fwd)

Date: Fri, 20 Apr 2018 07:55:51 +0200
Subject: [baavss-alert] Gaia18azl = ASASSN-V J203148.85+403800.1

Gaia18azl = ASASSN-V J203148.85+403800.1
- a strange variable from yesterday's GAIA Alerts
http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia18azl/

The ASAS-SN team has already sumitted this star into VSX as a possible 
SR variable with 206 days period, but I think it's not an SR variable.
https://asas-sn.osu.edu/database/light_curves/60527

Maybe a YSO with increasing magnitude eruptions? Or a symbiotic variable?
Period search including the latest ASAS-SN data gives 197 days period, 
but the phase plot is not convincing.
The GAIA Alert says it's "emission line star EM* VES 263 undergoing 
repeat outbursts".
Latest ASAS-SN light curve:
https://asas-sn.osu.edu/light_curves/91ae3e93-0f9f-4ccd-b163-4127390e07fc

J-K=0.65
B-V=1.88
U-B=0.55

Further observations are encouraged.

AAVSO charts: https://www.aavso.org/apps/vsp/chart/X22858AKA.png

-- 
FIDRICH Robert (Fidusz)
HAA/VSS
drotlevel/email: fidusz at zpok.hu

===

   The object is

203148.5 +403801 (2000.0) SS2-447 >13 s -
203148.7 +403758 (2000.0) AKARI-IRC_J2031488+403759 1.282e-01 - 
203148.6 +403800 (2000.0) HBH47-29 em V=12.9 - 
2MASS 203148.845 +403800.10 (2000.0) 9.551 9.110 8.895 

   Indeed in a star-forming region.

   Also an interesting object is located close:

203245.4 +403937 (2000.0) CYGV1478 SDOR 13.8 16.2 p - - - Bep
203245.3 +403936 (2000.0) HBH47-41 em V=13.2 Bep