J/other/IBVS/6106 RR Lyrae stars in GCVS observed by the QES (Bramich+, 2014)
RR Lyrae stars in the GCVS observed by the Qatar Exoplanet Survey.
Bramich D.M., Alsubai K.A., Arellano Ferro A., Parley N.R.,
Collier Cameron A., Horne K., Pollacco D., West R.G.
=2014IBVS.6106....1B 2014IBVS.6106....1B
ADC_Keywords: Stars, variable ; Stars, horizontal branch ; Surveys ;
Photometry, CCD
Keywords: variable stars - RR Lyrae - surveys - photometry - CCD
Abstract:
We used the light curve archive of the Qatar Exoplanet Survey to
investigate the RR Lyrae variable stars listed in the GCVS. Of 588
variables studied, we reclassified 14 as eclipsing binaries, one as an
RS CVn type variable, one as an irregular variable, four as classical
Cepheids, and one as a type II Cepheid, while also improving their
periods. We also report new RR Lyrae sub-type classifications for 65
variables and improve on the GCVS period estimates for 135 RR Lyrae
variables. There are seven double-mode RR Lyrae stars in the sample
for which we measured their fundamental and first overtone periods.
Finally, we detected the Blazhko effect in 38 of the RR Lyrae stars
for the first time and we successfully measured the Blazhko period for
26 of them.
Description:
We provide the 1783 light curves for the sample of 588 photometrically
variable objects described in this paper. The 588 variables breakdown
by type as follows: 482 RRAB, 78 RRC, 7 RR(B), 13 EW, 1 EA, 1 RS, 1
IA, 3 DCEP, 1 DCEPS and 1 CWB. Note that QES photometry is in the
optical, it is unfiltered, and it is calibrated on an absolute scale
with a scatter of ∼0.1mag using UCAC3 magnitudes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 69 588 List of studied variables (all stars in tables 1-6)
table1.dat 89 21 Variable stars reclassified as eclipsing binaries,
RS Canum Venaticorum-type variables (or RS CVn),
irregular variables of early spectral type,
classical Cepheids (or type I Cepheids), and
type II Cepheids
table2.dat 88 61 RR Lyrae stars with new sub-type classifications
table3.dat 104 7 Double-mode RR Lyrae stars in our sample that are
pulsating simultaneously in the fundamental and
first overtone modes
table4.dat 88 83 RR Lyrae stars with improved periods
table5.dat 82 27 New detections of the Blazhko effect in Galactic
RR Lyrae stars. These stars are not listed in
the catalogue of Skarka (2013, J/A+A/549/A101)
table6.dat 79 1358574 Unfiltered optical time-series CCD photometry
for 588 objects
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
I/315 : UCAC3 catalogue (Zacharias+ 2010)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [3UC]
4- 13 A10 --- UCAC3 UCAC3 star designation (I/315)
15- 23 A9 --- Name GCVS star name
27- 28 I2 h RAh Simbad or UCAC3 Right ascension (J2000)
30- 31 I2 min RAm Simbad or UCAC3 Right ascension (J2000)
33- 37 F5.2 s RAs Simbad or UCAC3 Right ascension (J2000)
39 A1 --- DE- Simbad or UCAC3 Declination sign (J2000)
40- 41 I2 deg DEd Simbad or UCAC3 Declination (J2000)
43- 44 I2 arcmin DEm Simbad or UCAC3 Declination (J2000)
46- 49 F4.1 arcsec DEs Simbad or UCAC3 Declination (J2000)
51- 56 A6 --- VType GCVS type
58- 68 F11.9 d Per ? GCVS period
69 A1 --- u_Per Uncertainty flag on period
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Byte-by-byte Description of file: table[1234].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- UCAC3 UCAC3 star designation
12- 20 A9 --- Name GCVS star name
22- 23 I2 h RAh Right ascension (J2000)
25- 26 I2 min RAm Right ascension (J2000)
28- 32 F5.2 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign (J2000)
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 44 F4.1 arcsec DEs Declination (J2000)
46- 50 A5 --- VTyp0 GCVS variable type
52- 56 A5 --- VType This paper variable type
57- 59 A3 --- n_VType [abefghij, ] Individual notes (1)
61- 66 F6.3 mag mag UCAC3 aperture magnitude
68- 78 F11.9 d Per0 ?=- GCVS period
80- 88 F9.6 d Per ?=- This paper (fundamental) period (2)
89 A1 --- n_Per [cd] Note on our period (1)
90- 96 F7.5 d P1 ? First overtone period for double-mode RRLyr
98-104 F7.5 --- P1/P0 ? Period ratio for double-mode RRLyr
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Note (1): Notes as follows:
a = Clear detection of the O'Connell effect (i.e. unequal brightness of the
two maxima)
b = Classification taken from van den Berg et al. (2002A&A...382..888V 2002A&A...382..888V)
c = Orbital period is 2.823094d (Mathieu et al. 2003AJ....125..246M 2003AJ....125..246M)
d = This star has a single light curve in our data that spans ∼195-days
(or ∼2.5 cycles)
e = Originally classified as a classical Cepheid by
Schmidt & Gross (1990PASP..102..978S 1990PASP..102..978S)
f = Classification taken from Andrievsky et al. (2010PASP..122..877A 2010PASP..122..877A)
g = Also classified as a classical Cepheid by Wils, Lloyd & Bernhard
(2006MNRAS.368.1757W 2006MNRAS.368.1757W. Cat. J/MNRAS/368/1757)
h = Clearly exhibits the Blazhko effect in our data
i = Not listed in the set of known Galactic field Blazhko RR Lyrae stars
from Skarka (2013A&A...549A.101S 2013A&A...549A.101S, Cat. J/A+A/549/A101)
j = The light curve has a strange shape for an RR Lyrae star. However, the
period and amplitude are consistent with an RRC classification.
Note (2): fundamental period for the double-mode RR Lyrae stars (table3).
All of our period estimates improve on the GCVS periods and they are
precise to the last decimal place quoted.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- UCAC3 UCAC3 star designation
12- 20 A9 --- Name GCVS star name
22- 23 I2 h RAh Right ascension (J2000)
25- 26 I2 min RAm Right ascension (J2000)
28- 32 F5.2 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign (J2000)
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 44 F4.1 arcsec DEs Declination (J2000)
46- 49 A4 --- VType RR Lyrae type
50 A1 --- n_VType [a] small Blazhko amplitude (1)
52- 57 F6.3 mag mag UCAC3 aperture magnitude
59- 68 F10.8 d Per ?=- GCVS period
70 A1 --- l_PerB Limit flag on PerB
71- 76 F6.2 d PerB ?=- Blazhko period
78- 82 F5.2 d e_PerB ? rms uncertainty on PerB
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Note (1): Although the amplitude modulations are small, they are clear to
the eye in the unphased light curve and they are strongly detected in
the power spectrum. To help confirm our conclusions for this star, we
checked the literature and found that Gomez-Forrellad & Garcia-Melendo
(1995IBVS.4247....1G 1995IBVS.4247....1G) also suspected this star of exhibiting the
Blazhko effect.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [3UC]
4- 13 A10 --- UCAC3 UCAC3 star designation
15- 23 A9 --- Name GCVS star name
25- 30 A6 --- VType RR Lyrae type
32- 44 F13.5 d HJD Heliocentric Julian day
46- 51 F6.3 mag mag Calibrated QES magnitude
53- 57 F5.3 mag e_mag Error on the calibrated QES magnitude
59- 79 A21 --- LCName Light curve identifier
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Acknowledgements:
Daniel Bramich, dan.bramich(at)hotmail.co.uk
History:
* 01-Jun-2014: First on-line version
* 26-Jan-2016: some positions corrected in table star.dat
(End) Daniel Bramich [QEERI, Qatar], Patricia Vannier [CDS] 28-May-2014