J/A+A/639/A23 Photometry & spectroscopy of EE Cep: 2014-15 (Pienkowski+, 2020)
International observational campaign of the 2014 eclipse of EE Cephei.
Pienkowski D., Galan C., Tomov T., Gazeas K., Wychudzki P.,
Mikolajewski M., Kubicki D., Staels B., Zola S., Pakonska P., Debski B.,
Kundera T., Ogloza W., Drozdz M., Baran A., Winiarski M., Siwak M.,
Dimitrov D., Kjurkchieva D., Marchev D., Arminski A., Miller I.,
Kolaczkowski Z., Mozdzierski D., Zahajkiewicz E., Brus P., Pigulski A.,
Smela T., Conseil E., Boyd D., Conidis G.J., Plauchu-Frayn I., Heras T.A.,
Kardasis E., Biskupski M., Kneip R., Hambalek L., Pribulla T., Kundra E.,
Nedoroscik J., Lopatovsky J., Garai Z., Rodriguez D., Kaminski T.,
Dubois F., Logie L., Blanco A.Capetillo , Kankiewicz P., Swierczynski E.,
Martignoni M., Sergey I., Kare Trandem Qvam J., Semkov E., Ibryamov S.,
Peneva S., Gonzalez Carballo J.-L., Ribeiro J., Dean S., Apostolovska G.,
Donchev Z., Corp L., McDonald P., Rodriguez M., Sanchez A., Wiersema K.,
Conseil E., Menke J., Sergey I., Richardson N.
<Astron. Astrophys. 639, A23 (2020)>
=2020A&A...639A..23P 2020A&A...639A..23P (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, CCD ; Photometry, UBVRI ;
Photometry, H-alpha ; Photometry, H-beta ; Spectroscopy ;
Stars, Be
Keywords: binaries: eclipsing - circumstellar matter -
stars: emission-line, Be
Abstract:
EE Cep is one of few eclipsing binary systems with a dark, dusty disk
around an invisible object similar to epsilon Aur. The system is
characterized by grey and asymmetric eclipses every 5.6yr, with a
significant variation in their photometric depth, ranging from ∼0.5mag
to ∼2.0mag.
The main aim of the observational campaign of the EE Cep eclipse in
2014 was to test the model of disk precession (Galan et al. 2012). We
expected that this eclipse would be one of the deepest with a depth of
∼2m.mag.
We collected multicolor observations from almost 30 instruments
located in Europe and North America. This photometric data covers 243
nights during and around the eclipse. We also analyse the low- and
high- resolution spectra from several instruments.
The eclipse was shallow with a depth of 0m.71 in V-band. The
multicolor photometry illustrates small color changes during the
eclipse with a total amplitude of order ~+0.15mag in B-I color index.
The linear ephemeris for this system is updated by including new times
of minima, measured from the three most recent eclipses at epochs E=9,
10 and 11. New spectroscopic observations were acquired, covering
orbital phases around the eclipse, which were not observed in the past
and increased the data sample, filling some gaps and giving a better
insight into the evolution of the Hα and NaI spectral line
profiles during the primary eclipse.
The eclipse of EE Cep in 2014 was shallower than expected 0.71mag
instead of ∼2.0mag. This means that our model of disk precession needs
revision.
Description:
We present a catalog of photometric and spectroscopic data collected
during and around of EE Cep eclipses in 2014. The photometric data
were obtained with 26 different instruments, mainly in Johnson and
Johnson-Cousins UBVRI(RI)C bands, and some small sets of the data were
obtained with interference filters JHK. The photometry from the
eclipse have been compiled into the set of consistent photometric data
in UBVRI(RI)C bands, that has been used in the paper. The spectra
released in this catalog were obtained with 6 different spectrographs
at low, medium and high resolutions (R in range ∼500- 30000). The 10
of these spectra cover narrow ranges of order 200 Angstroms with
H-alpha, H-beta lines or NaI doublet, and the rest of them cover longer
ranges of wavelengths - several thousands of Angstroms in the visual
domain or in the near infrared.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
22 09 22.757 +55 45 24.184 EE Cep = BD+55 2693
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea29.dat 35 781 UBVRI(RI)_C photometry, EE Cep eclipse 2014 ALL
tablea1.dat 45 323 BV(RI)c photometry, EE Cep eclipse 2014,
Athens Obs., 0.4 m Reflector telescope
tablea2p.dat 273 367 UBV(RI)_C and BVRc photometry, EE Cep eclipse 2014
(Tables A2 A4 A5 A6 A7 A14 A15 A18 A20 A21 A22 A24)
tablea3p.dat 159 168 UBVRI, BVI, BV(RI)_C and UBVR photometry,
EE Cep eclipse 2014 (Tables A3, A8, A13, A17, A19)
tablea9p.dat 59 245 UBV(RI)_C and JHK photometry, EE Cep eclipse 2014,
(Tables A9 A10 A11 A12 A16 A23 A25 A26 A27 A28)
tablea30.dat 92 21 Spectra obtained during and around of the
EE Cep eclipses in 2014
(fits files available for download)
sp/* . 21 Individual fits spectra
files/* . 31 Original tables
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Byte-by-byte Description of file: tablea1.dat tablea29.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Tab [A1 A29] Note on observations (G1)
5- 17 F13.5 d JD Julian date (integer part)
(HJD for tablea1.dat)
19- 23 F5.3 mag dmag Differential photometry in Band (1)
25- 29 F5.3 mag e_dmag rms uncertainty on dmag
31- 32 I2 --- N Number of points that were used to average
34- 35 A2 --- Band [UBVRIc ] Band for differential magnitude
37- 66 A30 --- Obs Observer name(s)
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Note (1): Differential magnitudes in respect of BD+55 2690 comparison star.
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Byte-by-byte Description of file: tablea2p.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Tab Table number (A2 A4 A5 A6 A7 A14 A15 A18 A20
A21 A22 A24) (G1)
5- 11 I7 d JD Julian date (integer part)
13- 18 F6.5 d JD+U ? Fractional part of JD
20- 25 F6.3 mag Umag ? B-band photometry
27- 31 F5.3 mag dUmag ? Differential B-band photometry (1)
33 A1 --- Band1 [U] Band (U)
36- 41 F6.5 d JD+B ? Fractional part of JD
43- 48 F6.3 mag Bmag ? B-band photometry
50- 54 F5.3 mag dBmag ? Differential B-band photometry (1)
56 A1 --- Band2 [B] Band (B)
59- 64 F6.5 d JD+V ? Fractional part of JD
66- 71 F6.3 mag Vmag ? V-band photometry
73- 77 F5.3 mag dVmag ? Differential V-band photometry (1)
79 A1 --- Band3 [V] Band (V)
82- 87 F6.5 d JD+Rc ? Fractional part of JD
89- 94 F6.3 mag Rcmag ? Rc-band photometry
96-100 F5.3 mag dRcmag ? Differential Rc-band photometry (1)
102-103 A2 --- Band4 [Rc ] Band (Rc)
105-110 F6.5 d JD+Ic ? Fractional part of JD
112-117 F6.3 mag Icmag ? Ic-band photometry
119-123 F5.3 mag dIcmag ? Differential Ic-band photometry (1)
125-126 A2 --- Band5 [Ic ] Band (Ic)
129-134 F6.5 d JD+BRc ? Fractional part of JD
136-141 F6.3 mag dBRcmag ? Differential BRc-band photometry (1)
143-145 A3 --- Band6 [BRc ] Band (BRc)
147-152 F6.5 d JD+BV ? Fractional part of JD
154-158 F5.3 mag dBVmag ? Differential BV-band photometry (1)
160-161 A2 --- Band7 [BV ] Band (BV)
163-169 F7.5 d JD+VRc ? Fractional part of JD
171-176 F6.3 mag dVRcmag ? Differential VRc-band photometry (1)
178-180 A3 --- Band8 [VRc ] Band (VRc)
182-281 A100 --- Obs Observer name(s)
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Note (1): ? Differential magnitudes in respect of BD+55 2690 comparison star.
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Byte-by-byte Description of file: tablea3p.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Tab Table number (A3 A8 A13 A17 A19) (G1)
5- 11 I7 d JD Heliocentric Julian date (integer part)
(HJD for A3 and A13)
13- 18 F6.5 d JD+U ? Fractional part of HJD
20- 24 F5.3 mag dUmag ? Differential U-band photometry (1)
26 A1 --- Band1 [U] Band (U)
29- 34 F6.5 d JD+B ? Fractional part of HJD
36- 40 F5.3 mag dBmag ? Differential B-band photometry (1)
42 A1 --- Band2 [B] Band (B)
45- 50 F6.5 d JD+V ? Fractional part of HJD
52- 56 F5.3 mag dVmag ? Differential V-band photometry (1)
58 A1 --- Band3 [V] Band (V)
61- 66 F6.5 d JD+R ? Fractional part of HJD
68- 72 F5.3 mag dRmag ? Differential R-band photometry (1)
74- 75 A2 --- Band4 [Rc ] Band (Rc)
77- 82 F6.5 d JD+I ? Fractional part of HJD
84- 88 F5.3 mag dImag ? Differential I-band photometry (1)
90- 91 A2 --- Band5 [Ic ] Band (Ic)
93- 98 F6.5 d JD+BRc ? Fractional part of JD
100-104 F5.3 mag dBRcmag ? Differential BRc-band photometry (1)
106-108 A3 --- Band6 [BRc ] Band (BRc)
110-115 F6.5 d JD+BV ? Fractional part of JD
117-122 F6.3 mag dBVmag ? Differential BV-band photometry
124-125 A2 --- Band7 [BV ] Band (BV)
128-133 F6.5 d JD+VRc ? Fractional part of JD
135-139 F5.3 mag dVRcmag ? Differential VRc-band photometry
141-143 A3 --- Band8 [VRc ] Band (VRc)
145-174 A30 --- Obs Observer name(s)
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Note (1): Differential magnitudes in respect of BD+55 2690 comparison star.
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Byte-by-byte Description of file: tablea9p.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Tab Table number
(A9 A10 A11 A12 A16 A23 A25 A26 A27 A28) (G1)
5- 17 F13.5 d JD Julian date (HJD for A10)
19- 24 F6.3 mag mag Magnitude in Band
26- 30 F5.3 mag dmag Differential magnitude in Band (1)
32- 33 A2 --- Band Band (U, B, V, Ic, Rc, J, H, K)
37- 86 A50 --- Obs Observer name(s)
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Note (1): Differential magnitudes in respect of BD+55 2690 comparison star.
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Byte-by-byte Description of file: tablea30.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "date" Date Date of observation
12- 19 A8 "h:m:s" UT Universal Time
21- 34 F14.6 d HJD Heliocentric Julian date
36- 63 A28 --- Instr Telescope and instrument
65- 73 A9 --- Range Spectral range
75- 79 I5 --- R Resolving power
81- 92 A12 --- FileName Name of FITS spectrum file in subdirectory sp
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Global notes:
Note (G1): Informations on observations as follows:
A1 = Photometry obtained at Athens Observatory (Greece) with standard BVRI
(Bessell) filters during and near the 2014 eclipse (E=11).
The 0.4m reflector telescope with an SBIG ST10 XME CCD camera was used.
Differential magnitudes are given with respect to BD+55 2690.
Each point is the mean value obtained from 3 h frames, together with
the corresponding standard deviations.
A2 = BV(RI)_c photometry obtained at Alan Guth (Belgium) Observatory during
and near the 2014 eclipse (E=11).
The 0.3 Schmidt-Cassegrain telescope with a SBIG STL-1001E CCD camera
was used.
Comparisons were made against three stars:
BD+55 2690, GSC-3973 2150, BD+55 2691.
The apparent magnitudes are also given with respect to BD+55 2690
(calculated with the adoption of BV(RI)_c magnitudes of BD+55 2690
given by Athens Observatory).
A3 = Photometry in standard UBVRI filters obtained at Suchora Observatory
(Poland) during and near the 2014 eclipse (E=11).
The 0.6m Cassegrain telescope with a CCD camera was used.
Differential magnitudes are given with respect to BD+55 2690.
A4 = UBV(RI)_C photometry obtained at Wyspa Pucka Observatory (Poland) during
and near the 2014 eclipse (E=11).
The 0.203 Schmidt-Cassegrain telescope with an Audine CCD camera was
used. The apparent magnitudes are also given with respect to BD+55 2690
(calculated with the adoption of BV(RI)_C magnitudes of BD+55 2690
given by Athens Observatory.
Comparison were made against star BD+55 2690.
A5 = BV(RI)_c photometry obtained at Bialkow (Poland) Observatory during and
near the 2014 eclipse (E=11). The 0.6 Cassegrain telescope with aANDOR
DW-432 BV CCD camera was used.
Comparisons were made against star: BD+55 2690.
The apparent magnitudes are also given with respect to BD+55 2690
(calculated with the adoption of BV(RI)_c magnitudes of BD+55 2690
given by Athens Observatory).
Comparison were made against star BD+55 2690.
A6 = UBV(RI)_c photometry obtained at Slovak Academy (Slovakia) Observatory
during and near the 2014 eclipse (E=11).
The 0.6 Cassegrain telescope with a Moravian Instruments G4-9000 CCD
camera was used. Comparisons were made against #three stars:
BD+55 2690, GSC-3973 2150, BD+55 2691. The apparent magnitudes are
also given with respect to BD+55 2690 (calculated with the adoption of
UBV(RI)_c magnitudes of BD+55 2690 given by Athens Observatory).
Comparison were made against star BD+55 2690.
A7 = BV(RI)_c photometry obtained at Furze Hill (United Kingdom) Observatory
during and near the 2014 eclipse (E=11).
The 0.35 Schmidt-Cassegrain telescope with a CCD camera was used.
Comparisons were made against three stars: BD+55 2690, GSC-3973 2150,
BD+55 2691. The apparent magnitudes are also given with respect
to BD+55 2690 (calculated with the adoption of BV(RI)_c magnitudes
of BD+55 2690 given by Athens Observatory).
A8 = Photometry in standard BVI filters obtained at Szczecin Observatory
(Poland) during and near the 2014 eclipse (E=11).
The 0.2m Newton telescope with an Artemis 285 CCD camera was used.
Differential magnitudes are given with respect to BD+55 2690.
A9 = VI_C photometry obtained at West Challow Observatory (United Kingdom)
during and near the 2014 eclipse (E=11).
The 0.356 Schmidt-Cassegrain telescope with a CCD camera was used.
Comparisons were made against three stars: BD+55 2690, GSC-3973 2150,
BD+55 2691. The apparent magnitudes are also given with respect to
BD+55 2690 (calculated with the adoption of VI_C magnitudes of
BD+55 2690 given by Athens Observatory.
Comparison were made against star BD+55 2690.
A10 = Photometry in standard V filters obtained at Spain during and near
the 2014 eclipse (E=11).
Comparisons were made against star GSC-3973 2150. The apparent
magnitudes are also given with respect to BD+55 2690 (calculated
with the adoption of V magnitudes of BD+55 2690 given in
Mikolajewski et al, 2003, IBVS 5412.
A11 = UBV(RI)_c photometry obtained at Rohzen (Bulgaria) Observatory during
and near the 2014 eclipse (E=11).
The 0.7 Schmidt telescope with a FLI PL 9000 CCD camera was used.
Comparisons were made against three stars: BD+55 2690, GSC-3973 2150,
BD+55 2691. The apparent magnitudes are also given with respect
to BD+55 2690 (calculated with the adoption of UBV(RI)_c magnitudes of
BD+55 2690 given by Athens Observatory). Comparison were made against
star BD+55 2690.
A12 = V photometry obtained at Glyfada Observatory during and near the 2014
eclipse (E=11). The 0.28 m Schmidt-Cassegrain telescope with a QHY9 CCD
camera was used. Comparisons were made against star BD+55 2690.
The apparent magnitudes are also given with respect to BD+55 2690
(calculated with the adoption of V magnitudes of BD+55 2690 given in
Mikolajewski et al, 2003, IBVS 5412.
A13 = Photometry obtained at PTMA Szczecin Observatory (Poland) in standard BV
filters during and near the 2014 eclipse (E=11).
The 0.2m Newton telescope with an Artemis 285 CCD camera was used.
Differential magnitudes are given with respect to BD+55 2690.
A14 = BVR_c photometry obtained at Spain Observatory during and near the 2014
eclipse (E=11). The 0.431 Corrected Dall-Kirkham telescope with a
SBIG STL-11000M CCD camera was used. Comparisons were made against
three stars: BD+55 2690, GSC-3973 2150, BD+55 2691. The apparent
magnitudes are also given with respect to BD+55 2690 (calculated with
the adoption of BVR_c magnitudes of BD+55 2690 given by Athens
Observatory). Comparison were made against star BD+55 2690.
A15 = BVR_c photometry obtained at Guadarrama (Spain) Observatory during and
near the 2014 eclipse (E=11). The 0.25 Schmidt-Cassegrain telescope
with a SBIG ST8XME CCD camera was used. Comparisons were made against
three stars: BD+55 2690, GSC-3973 2150, BD+55 2691. The apparent
magnitudes are also given with respect to BD+55 2690 (calculated with
the adoption of BV(RI)_c magnitudes of BD+55 2690 given by
Athens Observatory).
A16 = V photometry obtained at Astrolab Iris (Belgium) during and near the
2014 eclipse (E=11) The 0.68m Newton telescope with a SBIG STL-6303E
CCD camera was used. Comparisons were made against three stars:
BD+55 2690, GSC-3973 2150, BD+55 2691. The apparent magnitudes are also
given with respect to BD+55 2690 (calculated with the adoption of
V magnitudes of BD+55 2690 given in Mikolajewski et al, 2003,
IBVS 5412.
A17 = Photometry obtained at Rozhen Observatory (Bulgaria) in standard
BV(RI)_C filters during and near the 2014 eclipse (E=11). The 0.6m
Cassegrain telescope with a FLI PL 9000 CCD camera was used.
Differential magnitudes are given with respect to BD+55 2690.
A18 = BV(RI)_C photometry obtained at Tenerife (Spain) Observatory during
and near the 2014 eclipse (E=11). The 0.356 Schmidt-Cassegrain
telescope with a FLI MicroLine CCD camera was used. Comparisons were
made against three stars: BD+55 2690, GSC-3973 2150, BD+55 2691.
The apparent magnitudes are also given with respect to BD+55 2690
(calculated with the adoption of BV(RI)_C magnitudes of BD+55 2690
given by Athens Observatory).
Comparison were made against star BD+55 2690.
A19 = Photometry in standard UBVR filters obtained at Jan Kochanowski
Observatory (Poland) during and near the 2014 eclipse (E=11).
The 0.35m Schmidt-Cassegrain telescope with a SBIG ST-7XE CCD camera
was used. Differential magnitudes are given with respect to BD+55 2690.
A20 = BVI_c photometry obtained at Magnago (Italy) Observatory during and near
the 2014 eclipse (E=11). The 0.25 Schmidt-Cassegrain telescope with a
SBIG ST9 CCD camera was used. Comparisons were made against star
BD+55 2690. The apparent magnitudes are also given with respect to
BD+55 2690 (calculated with the adoption of BVI_c magnitudes of
BD+55 2690 given by Athens Observatory).
Comparison were made against star BD+55 2690.
A21 = BVR_b photometry obtained at Horten VGS (Norway) Observatory during and
near the 2014 eclipse (E=11). The 0.46 Ritchey-Chretien telescope with
a SBIG STL-1301E CCD camera was used. Comparisons were made against
three stars: BD+55 2690, GSC-3973 2150, BD+55 2691. The apparent
magnitudes are also given with respect to BD+55 2690 (calculated with
the adoption of BV(RI)_c magnitudes of BD+55 2690 given by Athens
Observatory).
A22 = BV photometry obtained at New Mexico Skies Observatory (Mexic) during
and near the 2014 eclipse (E = 11). The 0.508 m Corrected Dall-Kirkham
telescope with a CCD camera was used. Comparisons were made against
three stars: BD+55 2690, GSC-3973 2150, BD+55 2691. The apparent
magnitudes are also given with respect to BD+55 2690 (calculated with
the adoption of BV magnitudes of BD+55 2690 given in Mikolajewski et
al, 2003, IBVS 5412.
A23 = V photometry obtained at Cerro del Viento Observatory during and near
the 2014 eclipse (E=11). The 0.2m Schmidt-Cassegrain telescope with a
CCD camera was used. Comparisons were made against three stars:
BD+55 2690, GSC-3973 2150, BD+55 2691. The apparent magnitudes are also
given with respect to BD+55 2690 (calculated with the adoption of
V magnitudes of BD+55 2690 given in Mikolajewski et al, 2003,
IBVS 5412.
A24 = BVR_c photometry obtained at private Observatory in France during and
near the 2014 eclipse (E=11). The 0.203 homemade telescope with a
SBIG ST7XE CCD camera was used. Comparisons were made against three
stars: BD+55 2690, GSC-3973 2150, BD+55 2691. The apparent magnitudes
are also given with respect to BD+55 2690 (calculated with the
adoption of BV(RI)_c magnitudes of BD+55 2690 given by Athens
Observatory).
A25 = BVR_c photometry obtained at Leicester (United Kingdom) Observatory
during and near the 2014 eclipse (E=11). The 0.508 Corrected
Dall-Kirkham telescope with a SBIG ST-2000XM CCD camera was used.
Comparisons were made against three stars: BD+55 2690, GSC-3973 2150,
BD+55 2691. The apparent magnitudes are also given with respect to
BD+55 2690 (calculated with the adoption of BV(RI)_c magnitudes of
BD+55 2690 given by Athens Observatory).
A26 = V(RI)_c photometry obtained at Gualba (Spain) Observatory during and
near the 2014 eclipse (E=11). The 0.356 Schmidt-Cassegrain telescope
with a SBIG ST8-XME CCD camera was used. Comparisons were made against
star: BD+55 2690. The apparent magnitudes are also given with respect
to BD+55 2690 (calculated with the adoption of BV(RI)_c magnitudes of
BD+55 2690 given by Athens Observatory).
A27 = V photometry obtained at Madrit-Ventila Observatory during and near the
2014 eclipse (E=11). The 0.06m refractor telescope with a QHY-Img0S
ICX-618AL CCD camera was used. Comparisons were made against star
BD+55 2690. The apparent magnitudes are also given with respect to
BD+55 2690 (calculated with the adoption of V magnitudes of BD+55 2690
given in Mikolajewski et al, 2003, IBVS 5412.
A28 = JHK_S photometry obtained with with CAIN infrared camera operating on
1.5m Carlos Sanchez telescope at Teide Observatory
A29 = The mean points of the average UBVRI in Johnson photometric system and
(RI)_C in Cousins photometric system light curves obtained during and
near the 2014 (E=11) eclipses. Magnitudes and the corresponding
standard deviations are given. Mean magnitudes were obtained by
averaging the differential magnitude data from Tables A.1-A.28
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Acknowledgements:
Daniel Pienkowski, dapien(at)camk.edu.pl
(End) Patricia Vannier [CDS] 11-Feb-2020