Outburst of V1118 Ori during 2018-2020
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OUTBURST OF V1118 Ori DURING 2018-2020
J. Garcia Garcia,1 E. S. Parsamian,2 and A. A. Akopian2
New observational data on the last two outbursts of the EXor star V1118 Ori are presented. The combined light curve of the last outburst is derived and fitted. The dates of the start of the outburst, its maximum, and end, as well as the maximum magnitude, and the rates of increase and decrease of the brightness were determined. Keywords: V1118 Ori: outburst
1. Introduction
The variability of V1118 Ori was discovered in 1983 [1] and the star was soon classified as EXor or Subfuor [2,3]. Table 1 lists all the outbursts of V1118 Ori recorded since the star’s discovery in 1983 to the present. The next to the last outburst occurred in September 2015. Our observations of this outburst covered the period 2014-2016. The bulk of the data from our observations was presented in Ref. 16. After this publication new data were obtained, which made it possible to supplement the light curve (Fig. 1, left).
(1) Tamarindo, 5, 41089 Dos Hermanas, Sevilla, Spain; e-mail: [email protected] (2) V. A. Ambartsumyan Byurakan Astrophysical Observatory, Armenia; e-mail: [email protected]
Original article submitted July 1, 2020. Translated from Astrofizika, Vol. 63, No. 4, pp. 667-671 (November 2020). 0571-7256/19/6304-0585 ©2020 Springer Science+Business Media, LLC
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TABLE 1. Recorded Outbursts of V1118 Ori
Epoch of outburst
References
1983-1984
Herst, et al. [1], Parsamian and Gasparian [2], Kosai [4]
1988-1990
Parsamian, et al. [5,6]
1992-1994
Garcia Garcia, Mampaso, and Parsamian [7], Parsamian, et al. [8]
1996-1998
Hayakawa, et al. [10], Garcia Garcia and Parsamian [9]
2004-2006
Waagen, et al. [11], Williams, et al. [12], Garcia Garcia, Parsamian, et al. [13]
2007-2008
Garcia Garcia and Parsamian [14]
2015-2017
Giannini, et al. [15], Garcia Garcia and Parsamian [16]
2018-2019
This article, Giunta, et al [17,18].
2. Results
In this paper we present data from observations in the V band on the 20-cm Schmidt-Cassegrain telescope with a CCD camera from the latest outburst covering the periods September 11, 2018-February 12, 2019 and September 28, 2019-February 16, 2020, which coincide with the beginning and end of the outburst (Fig. 1). Figure 1 shows that the outburst began in early September 2018 and ended in the middle of February 2020. Between these two dates the outburst was observed by a group of Italian astronomers [17,18] in the g, r, i, and z bands. The outburst was discovered by them on May 9, 2019, after which the star was inaccessible for observation until the middle of August. After this, the star was regularly observed until the end of September. Judging from the data (Fig. 1, on the right), the maximum brightness peak of V1118 Ori was in the period from June through August 2019, but
11.22.13 12.27.14 1.31.16 13.5
3.6.17
4.10.18 5.15.19 6.18.20
mv g
14.5 15.5 16.5 17.5 2456400
2457000
2457600
2458200
2458800
JD
Fig. 1. The light curves of the next to last and mos
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