J/A+A/617/A32 MASCARA bright variable stars light curves (Burggraaff+, 2018)
Studying bright variable stars with the Multi-site All-Sky CAmeRA (MASCARA).
Burggraaff O., Talens G.J.J., Spronck J., Lesage A.-L., Stuik R.,
Otten G.P.P.L., Van Eylen V., Pollacco D., Snellen I.A.G.
<Astron. Astrophys. 617, A32 (2018)>
=2018A&A...617A..32B 2018A&A...617A..32B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry ; Binaries, eclipsing
Keywords: stars: variables: general - stars: variables: Cepheids -
binaries: eclipsing
Abstract:
The Multi-site All-Sky CAmeRA (MASCARA) aims to find the brightest
transiting planet systems by monitoring the full sky at magnitudes
4<V<8.4, taking data every 6.4 seconds. The northern station has been
operational on La Palma since February 2015. These data can also be
used for other scientific purposes, such as the study of variable
stars. In this paper we aim to assess the value of MASCARA data for
studying variable stars by determining to what extent known variable
stars can be recovered and characterised, and how well new, unknown
variables can be discovered. We used the first 14 months of MASCARA
data, consisting of the light curves of 53401 stars with up to one
million flux points per object. All stars were cross-matched with the
VSX catalogue to identify known variables. The MASCARA light curves
were searched for periodic flux variability using generalised
Lomb-Scargle periodograms. If significant variability of a known
variable was detected, the found period and amplitude were compared
with those listed in the VSX database. If no previous record of
variability was found, the data were phase folded to attempt a
classification. Of the 1919 known variable stars in the MASCARA sample
with periods 0.1<P<10-days, amplitudes >2%, and that have more
than 80 hours of data, 93.5% are recovered. In addition, the periods
of 210 stars without a previous VSX record were determined, and 282
candidate variable stars were newly identified. We also investigated
whether second order variability effects could be identified. The
O'Connell effect is seen in seven eclipsing binaries, of which two
have no previous record of this effect. MASCARA data are very well
suited to study known variable stars. They also serve as a powerful
means to find new variables among the brightest stars in the sky.
Follow-up is required to ensure that the observed variability does not
originate from faint background objects.
Description:
Tables A1 and B1 contain variable star parameters derived from MASCARA
photometric data. Photometric time-series of 3268 known and new
variable stars are included that were obtained sing the MASCARA
telescope. The MASCARA photometry covers the period from February 2015
to March 2016 and uses no filter.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 188 210 Known and suspected variable stars parameters
tableb1.dat 156 282 New candidate variable stars parameters
list.dat 20 3268 List of light curve files
lc/* . 3268 *Individual light curves
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Note on lc/*: files named dASCC.dat, i.e d7027.dat for ASCC 7027.
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See also:
I/280 : All-Sky Compiled Catalogue of 2.5 million stars (Kharchenko+ 2009)
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ASCC ASCC-2.5 number (G1)
10- 15 I6 --- HD ?=0 HD number (G2)
18- 23 I6 --- HIP ?=0 Hipparcos number (G3)
26- 29 I4 --- TYC1 ?=0 TYC1 number from Tycho-2 (G4)
33- 36 I4 --- TYC2 ?=0 TYC2 number from Tycho-2 (G5)
39 I1 --- TYC3 ?=0 TYC3 number from Tycho-2 (G6)
43- 48 I6 --- OID VSX identifier (G7)
52- 60 A9 --- VSXname Name used in VSX catalogue (G8)
63- 72 A10 --- VSXtype ?=0.0 Variability type in VSX catalogue (G9)
75 A1 --- vartype [0EP] Variability type from MASCARA
78- 82 F5.3 mag Vmag V magnitude in Johnson system (G10)
85- 90 F6.3 mag Bmag B magnitude in Johnson system (G11)
102-110 A9 --- SpType Spectral type in MK or HD system (G12)
113-125 F13.9 deg RAdeg Right Ascension J2000.0, epoch 1991.25 (G13)
128-139 F12.8 deg DEdeg Declination J2000.0, epoch 1991.25 (G14)
142-146 I5 --- nrdata Number of photometric MASCARA data points
149-158 F10.7 d P Best-fitting period
161-169 F9.7 d e_P ?=0 Standard error on best-fitting period
172-174 I3 mmag Amp Amplitude of variability
177-188 F12.7 d Epoch Epoch of minimal brightness (HJD-2450000)
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ASCC ASCC-2.5 number (G1)
10- 15 I6 --- HD ?=0 HD number (G2)
18- 23 I6 --- HIP ?=0 Hipparcos number (G3)
26- 29 I4 --- TYC1 ?=0 TYC1 number from Tycho-2 (G4)
33- 36 I4 --- TYC2 ?=0 TYC2 number from Tycho-2 (G5)
39 I1 --- TYC3 ?=0 TYC3 number from Tycho-2 (G6)
42 A1 --- vartype [0EP] Variability type from MASCARA
45- 49 F5.3 mag Vmag V magnitude in Johnson system (G10)
52- 57 F6.3 mag Bmag B magnitude in Johnson system (G11)
64- 77 A14 --- SpType Spectral type in MK or HD system (G12)
80- 92 F13.9 deg RAdeg Right Ascension J2000.0, epoch 1991.25 (G13)
95-106 F12.8 deg DEdeg Declination J2000.0, epoch 1991.25 (G14)
109-113 I5 --- nrdata Number of photometric MASCARA data points
116-126 F11.7 d P Best-fitting period
129-137 F9.7 d e_P ?=0 Standard error on best-fitting period
140-142 I3 mmag Amp Amplitude of variability
145-156 F12.7 d Epoch Epoch of minimal brightness (HJD-2450000)
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ASCC ASCC-2.5 number (G1)
9- 20 A12 --- FileName Name of the light curve file in subdirectory lc
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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1- 15 F15.7 d HJD Heliocentric Julian date
18- 27 F10.7 h LST Local sidereal time
29- 39 F11.7 mag mag Magnitude
42- 50 F9.7 mag e_mag Standard error on magnitude
53- 64 F12.10 --- Phase Phase, from epoch and best-fitting period
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Global notes:
Note (G1): ASCC: Bytes 171-177 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G2): HD: Bytes 155-160 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G3): HIP: Bytes 148-153 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G4): TYC1: Bytes 137-140 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G5): TYC2: Bytes 141-145 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G6): TYC3: Bytes 146 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G7): OID: Bytes 1-7 from VSX file vsx.dat (Cat. B/vsx)
Note (G8): VSXname: Bytes 9-38 from VSX file vsx.dat (Cat. B/vsx)
Note (G9): VSXtype: Bytes 62-91 from VSX file vsx.dat (Cat. B/vsx)
Note (G10): Vmag: Bytes 84-88 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G11): Bmag: Bytes 78-82 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G12): SpType: Bytes 116-135 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G13): RAdeg: Bytes 1-12 from ASCC-2.5 files cc*.dat (Cat. I/280)
Note (G14): DEdeg: Bytes 14-25 from ASCC-2.5 files cc*.dat (Cat. I/280)
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Acknowledgements:
Olivier Burggraaff, burggraaff(at)strw.leidenuniv.nl
(End) Patricia Vannier [CDS] 04-Jun-2018