[vsnet-alert 22807] ASASSN-18aan

roberto nesci Roberto.Nesci at iaps.inaf.it
Thu Dec 6 00:44:16 JST 2018


Roberto Nesci (INAF/IAPS) and Taavi Tuvikene (Tartu Observatory, University of 
Tartu, Estonia)report:
Following the announcement of the transient ASASSN-18aan (vsnet-alert 22802) we 
searched in the Asiago archive for plates containing the star. Seventeen pairs 
of plates, blue (103aO+GG13) and infrared (IN+RG5) of the 65/90 Schmidt 
telescope containig the star were found, ranging from year 1968 to 1975: all the 
plates are of good quality and were digitized with an EPSON 1680 PRO scanner for 
an automatic search of Mira variables. The Infrared magnitudes of ASASSN-18aan 
were computed with a dedicated pipeline, developed in the frame of the APPLAUSE 
project (Tuvikene et al. 2014, ASPL Conf. 127), using as comparison stars those 
of the UCAC4 catalog (i' band): details of the photometric procedure are given 
in Nesci et al. (2018 RMxAA 54, 341).
The light curve of the star shows an average value around i'=16.3 and shows a 
peak at i'=15.4 on 1970.646, with 1 mag difference from the previous and the 
following plate: an eye inspection of the corresponding blue plates confirm the 
flare, excluding a plate defect. We are therefore confident to have catched an 
historic flare of this star.
-- 
prof. Roberto Nesci,  associated to Istituto Nazionale di Astrofisica,
(National Institute of Astrophysics) INAF-IAPS, via Fosso del Cavaliere 100, 
00133 Roma, Italia



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