J/A+A/602/A99 Photometry of EXors from Asiago plates (Jurdana-Sepic+, 2017)
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.,
Lorenzetti D.
<Astron. Astrophys. 602, A99 (2017)>
=2017A&A...602A..99J 2017A&A...602A..99J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, pre-main sequence ; Photometry, UBVRI
Keywords: stars: pre-main sequence - stars: variables -
astronomical data bases: catalogs - stars: individual: NY Ori -
stars: individual: V1118 Ori - stars: individual: V1143 Ori
Abstract:
EXor objects are young variables that show episodic variations of
brightness commonly associated to enhanced accretion outbursts.
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.
A total of 484 plates were investigated, providing a total of more
than 1000 magnitudes for the three stars, which cover a period of
about 35yrs between 1959 to 1993. We then compared our data with
literature data. 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 40yrs of monitoring.
Description:
File table1 contains the BVRI photometry of NY, V1143, V1118 in Orion
from the plates of the Asiago Observatory, Italy. Columns provide date
and central UT of any exposure, plate emulsion, the adopted filter,
the telescope, the plate number, and the magnitude derived for the
three sources with the estimated error. See notes for further details.
Objects:
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RA (2000) DE Designation(s)
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05 35 36.01 -05 12 25.3 NY Ori = V* NY Ori
05 38 03.90 -04 16 42.8 V1143 Ori = V* V1143 Ori
05 34 44.74 -05 33 42.2 V1118 Ori = V* V1118 Ori
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 53 3 List of studied stars
table1.dat 95 447 BVRI Asiago plate photometry of NY Ori,
V1143 Ori, and V1118 Ori
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See also:
J/A+A/511/A63 : V1118 Ori UBVRIJHK outburst light curves (Audard+, 2010)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name
11- 12 I2 h RAh Simbad Right ascension (J2000.0)
14- 15 I2 min RAm Simbad Right ascension (J2000.0)
17- 21 F5.2 s RAs Simbad Right ascension (J2000.0)
23 A1 --- DE- Simbad Declination sign (J2000.0)
24- 25 I2 deg DEd Simbad Declination (J2000.0)
27- 28 I2 arcmin DEm Simbad Declination (J2000.0)
30- 33 F4.1 arcsec DEs Simbad Declination (J2000.0)
35- 39 F5.2 mag Bmag Simbad B band magnitude
41- 45 F5.2 mag Vmag Simbad V band magnitude
47- 53 A7 --- SpType Simbad MK spectral type
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date
15- 24 A10 "YYYY-MM-DD" Obs.date Date of observation (yyyy-mm-dd)
26- 30 A5 "h:m" Obs.time Central UT of the exposure (hh:mm)
32- 38 A7 --- Emuls Emulsion
40- 44 A5 --- Filt Filter
46- 47 A2 --- Tel Telescope (1)
49- 53 I5 --- Plate Plate number
55 A1 --- Band1 [BVRI] NY Ori observed band
57- 61 F5.2 mag mag1 ? NY Ori magnitude in Band Band1
63- 66 F4.2 mag e_mag1 ? NY Ori rms uncertainty on mag1
68 A1 --- Band2 [BVRI] V1143 Ori observed band
70 A1 --- l_mag2 [<] V1143 Ori magnitude lower limit flag
71- 75 F5.2 mag mag2 ? V1143 Ori magnitude in Band Band2
77- 80 F4.2 mag e_mag2 ? V1143 Ori rms uncertainty on mag2
82 A1 --- Band3 [BVRI] V1118 Ori observed band
84 A1 --- n_mag3 [*] V1118 Ori limit flag (2)
85 A1 --- l_mag3 [<] V1118 Ori magnitude lower limit flag
86- 90 F5.2 mag mag3 ? V1118 Ori magnitude in Band Band3
92- 95 F4.2 mag e_mag3 ? V1118 Ori rms uncertainty on mag3
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Note (1): the following Asiago telescopes were used:
SP = (Schmidt Piccolo): 40/50cm diameter, 100cm focal length
SG = (Schmidt Grande): 67/92cm diameter, 208cm focal length
Note (2): Flag as follows:
* = indicates that it was only possible to rule out that the source was
going through a bright outburst at the moment of the plate exposure.
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Acknowledgements:
Simone Antoniucci, simone.antoniucci(at)oa-roma.inaf.it
(End) Simone Antoniucci [INAF-OAR, Italy], Patricia Vannier [CDS] 07-Mar-2017