2017A&A...602A..99J


Query : 2017A&A...602A..99J

2017A&A...602A..99J - Astronomy and Astrophysics, volume 602A, 99-99 (2017/6-1)

Investigating the past history of EXors: the cases of V1118 Orionis, V1143 Orionis, and NY Orionis.

JURDANA-SEPIC R., MUNARI U., ANTONIUCCI S., GIANNINI T., LI CAUSI G. and LORENZETTI D.

Abstract (from CDS):

Context. EXor objects are young variables that show episodic variations of brightness commonly associated to enhanced accretion outbursts.
Aims. With the aim of investigating the long-term photometric behaviour of a few EXor sources, we present here data from the archival plates of the Asiago observatory, showing the Orion field where the three EXors V1118, V1143, and NY are located.
Methods. A total of 484 plates were investigated, providing a total of more than 1000 mag for the three stars, which cover a period of about 35 yr between 1959 to 1993. We then compared our data with literature data.
Results. Apart from a newly discovered flare-up of V1118, we identify the same outbursts already known, but we provide two added values: (i) a long-term sampling of the quiescence phase; and (ii) repeated multi-colour observations (BVRI bands). The former allows us to give a reliable characterisation of the quiescence, which represents a unique reference for studies that will analyze future outbursts and the physical changes induced by these events. The latter is useful for confirming whether the intermittent increases of brightness are accretion-driven (as in the case of V1118), or extinction-driven (as in the case of V1143). Accordingly, doubts arise about the V1143 classification as a pure EXor object. Finally, although our plates do not separate NY Ori and the star very close to it, they indicate that this EXor did not undergo any major outbursts during our 40 yr of monitoring.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be - catalogs - stars: individual: NY Ori - stars: individual: V1118 Ori - stars: individual: V1143 Ori - stars: individual: V1143 Ori

VizieR on-line data: <Available at CDS (J/A+A/602/A99): stars.dat table1.dat>

Simbad objects: 9

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Number of rows : 9
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 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2209 1
3 M 42 OpC 05 35 17 -05 23.4           ~ 3970 0
4 V* V566 Ori Or* 05 35 35.7890236368 -05 12 20.592879516 10.07 9.98 9.92     A0V 59 0
5 V* NY Ori Or* 05 35 36.0088602048 -05 12 25.298255700 14.079 13.847 13.232   11.445 G6-K2e 66 0
6 V* V1143 Ori Or* 05 38 03.8942524320 -04 16 42.856801608     17.0     ~ 60 0
7 V* V960 Mon Or* 06 59 31.5890411256 -04 05 27.765639744   16.11 14.94 13.92 12.67 ~ 38 1
8 V* GM Cep Or* 21 38 17.3260136976 +57 31 22.013398272 15.016 16.40 13.146 12.090 11.117 F9 42 0
9 NAME Local Group GrG ~ ~           ~ 7904 0

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2023.02.04-09:44:48

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