2020A&A...637A..83G


Query : 2020A&A...637A..83G

2020A&A...637A..83G - Astronomy and Astrophysics, volume 637A, 83-83 (2020/5-1)

Subsequent outbursts of the same EXor source possibly present similar features.

GIANNINI T., GIUNTA A., LORENZETTI D., ALTAVILLA G., ANTONIUCCI S., STRAFELLA F. and TESTA V.

Abstract (from CDS):


Context. V1118 Ori is a classical EXor source whose light curve has been monitored, although not continuously, over the past 30 years. This source underwent a powerful outburst in 2005, followed by 10 years of quiescence and a less intense outburst in 2015. In 2019, a new intense brightness increase was observed (Δg∼3mag).
Aims. This new accretion episode offers the opportunity to compare the photometric and spectroscopic properties of multiple outbursts of the same source. This allows us to highlight the differences and similarities among various events by removing any possible bias related to the intrinsic properties of the star-disk system.
Methods. We discovered the 2019 V1118 Ori outburst by examining the g-band light curve acquired by the Zwicky Transient Facility and followed the declining phase with the Rapid Eye Mount telescope in the griz bands. Two near-infrared spectra were also acquired at different brightness stages with the Large Binocular Telescope.
Results. The last event shows the following characteristics: (1) an amplitude similar to that of 2015 and lower than that of 2005; (2) a duration of less than one year as in previous events; (3) a increasing (decreasing) speed of 0.018 (0.031)mag/day, which is different from previous cases; (4) a gradually blueing of the [g-r] color is observed over time, while the [r - i] color remains roughly unchanged; (5) with few exceptions, the near-infrared lines (mainly HI recombination) are the same as those observed in 2015; and (6) the mass accretion rate peaks at Macc∼10–7M/yr and decreases in about a month down to a few 10–8M/yr.
Conclusions. Our analysis shows that the comparison of data from different outbursts of the same source is a nontrivial exercise, which allows us to obtain important clues that are useful to drive theoretical efforts toward a better understanding of the EXor phenomenon.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: pre-main sequence - stars: individual: V1118 Ori - stars: variables: T Tauri, Herbig Ae/Be

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* V1118 Ori Or* 05 34 44.9889538895 -05 33 41.344187987 15.053 15.378 14.430 15.22 12.701 M1e 138 0
2 V* V1647 Ori Or* 05 46 13.1370578472 -00 06 04.885093296     18.1     ~ 262 1
3 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1449 0
4 Cl Melotte 111 OpC 12 24 03 +25 39.1           ~ 454 0
5 V* PV Cep Or* 20 45 53.9540390184 +67 57 38.679941304   19.27 17.46 15.98 14.60 A5 264 3

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2023.02.02-18:43:18

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