J/other/JAD/20.4 180 APASS variable stars in Aquarius (Munari+, 2014)
APASS discovery and characterization of 180 variable stars in Aquarius.
Munari U., Henden A., Frigo A., Dallaporta S.
<J. Astron. Data, 20, 4 (2014)>
=2014JAD....20....4M 2014JAD....20....4M
ADC_Keywords: Stars, variable ; Photometry
Keywords: technique: APASS photometry - stars: variable
Abstract:
During a search for RR Lyr variable stars candidate members of the
Aquarius stream, which led to the discovery of 71 such objects, we
also discovered an additional 180 variables which are presented in
this paper. Of them, 141 were previously reported as variables and 39
are brand new. For all 180 objects, we provide: our epoch photometry,
accurate positions, mean magnitude and amplitude of variation in
Landolt B,V and Sloan g, r, i bands, cross-identification with WISE,
2MASS and GALEX surveys, accurate BVRCICgri photometric sequences and
finding charts identifying the variable and the stars of the
photometric sequence provided to support follow-up observations. We
carried out a Fourier search on all 39 new variables and found periods
for 11 of them.
Description:
The large area on the sky covered by the Aquarius stream requires
instruments with a very large field of view. We obtained multi-band
photometry from CTIO (Chile) with the same equipment used for the
APASS all sky photometric survey, separately from the main Survey
program (Henden et al. 2012, JAAVSO 40, 430, Henden & Munari 2014,
CoSka 43, 518). A pair of twin remotely controlled, small telescopes
obtain simultaneous CCD observations over five optical bands: B, V
(tied to the equatorial standards of Landolt 2009AJ....137.4186L 2009AJ....137.4186L, Cat.
J/AJ/137/4186) and g,r,i bands (tied to the 158 primary standards
given by Smith et al. (2002AJ....123.2121S 2002AJ....123.2121S), that define the Sloan
photometric system). The telescopes are 20-cm f /3.6 astrographs
feeding Apogee U16m cameras (4096x4096 array, 9um pixels), that
cover a field 2.9° wide with a 2.6arcsec/pix plate factor. One
telescope exposes the B and g bands, while the other in parallel
exposes the V, r and i bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 109 180 List of the 180 discovered variable stars
table2.dat 126 2452 Epoch photometry
table3.dat 78 180 WISE W1 and W2, 2MASS J, H and Ks, and
GALEX FUV and NUV magnitudes
table4.dat 75 141 List of the 141 stars among the discovered
variables which have a cross-identification in
either SIMBAD or the AAVSO Variable Star Index
(VSX) with already known variables
table5.dat 141 1644 Photometric comparison sequences
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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- 17 A17 --- APASS APASS designation (JDDD.dddd+DD.ddddd)
19- 20 I2 h RAh Right ascension (Eq=J2000, Ep=2012.9)
22- 23 I2 min RAm Right ascension (Eq=J2000, Ep=2012.9)
25- 29 F5.2 s RAs Right ascension (Eq=J2000, Ep=2012.9)
31 A1 --- DE- Declination sign (Eq=J2000, Ep=2012.9)
32- 33 I2 deg DEd Declination (Eq=J2000, Ep=2012.9)
35- 36 I2 arcmin DEm Declination (Eq=J2000, Ep=2012.9)
38- 41 F4.1 arcsec DEs Declination (Eq=J2000, Ep=2012.9)
43- 44 I2 --- N [5/24] Number of independent observation epochs
46- 51 F6.3 mag Bmag Mean Landolt B magnitude
53- 58 F6.3 mag Vmag Mean Landolt V magnitude
60- 65 F6.3 mag gmag Mean Sloan g magnitude
67- 72 F6.3 mag rmag Mean Sloan r magnitude
74- 79 F6.3 mag imag Mean Sloan i magnitude
81- 85 F5.3 mag e_Bmag rms uncertainty on Bmag
87- 91 F5.3 mag e_Vmag rms uncertainty on Vmag
93- 97 F5.3 mag e_gmag rms uncertainty on gmag
99-103 F5.3 mag e_rmag rms uncertainty on rmag
105-109 F5.3 mag e_imag rms uncertainty on imag
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- APASS APASS designation
19- 30 F12.8 deg RAdeg Right ascension of observation (J2000)
32- 43 F12.8 deg DEdeg Declination of observation (J2000)
46- 56 F11.5 d Epoch Epoch of observation (JD-2400000)
58- 63 F6.3 mag Bmag ?=99.999 Landolt B magnitude
65- 70 F6.3 mag Vmag ?=99.999 Landolt V magnitude
72- 77 F6.3 mag gmag ?=99.999 Sloan g magnitude
79- 84 F6.3 mag rmag ?=99.999 Sloan r magnitude
86- 91 F6.3 mag imag ?=99.999 Sloan i magnitude
94- 98 F5.3 mag e_Bmag ?=0 rms uncertainty on Bmag
101-105 F5.3 mag e_Vmag ?=0 rms uncertainty on Vmag
108-112 F5.3 mag e_gmag ?=0 rms uncertainty on gmag
115-119 F5.3 mag e_rmag ?=0 rms uncertainty on rmag
122-126 F5.3 mag e_imag ?=0 rms uncertainty on imag
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- APASS APASS designation
19- 23 F5.3 arcsec dW [0/6.2]?=- Separation of APASS source with
WISE/2MASS counterpart
25- 30 F6.3 mag W1 ?=- WISE W1 magnitude
32- 37 F6.3 mag W2 ?=- WISE W2 magnitude
39- 44 F6.3 mag Jmag ?=- 2MASS J magnitude
46- 51 F6.3 mag Hmag ?=- 2MASS H magnitude
53- 58 F6.3 mag Ksmag ?=- 2MASS Ks magnitude
60- 64 F5.3 arcsec dG [0/4.1]? Separation of APASS source with
GALEX counterpart
66- 71 F6.3 mag FUV ?=- GALEX FUV magnitude
73- 78 F6.3 mag NUV ? GALEX NUV magnitude
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- APASS APASS designation
19- 41 A23 --- Name Cross-identification in either SIMBAD or the
AAVSO Variable Star Index (VSX)
43- 45 A3 --- Stype Simbad object type
47- 57 A11 --- Vtype VSX variability type
59- 62 F4.2 mag Dmag ? Amplitude of variability as listed by VSX
64- 75 F12.8 d Per ? Period as listed by VSX
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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- 17 A17 --- APASS APASS designation
19 A1 --- Comp Comparison star designation as in Fig. 5
21- 30 F10.6 deg RAdeg Right ascension of Comp (J2000)
32- 41 F10.6 deg DEdeg Declination of Comp (J2000)
43- 48 F6.3 mag Bmag Landolt B magnitude
50- 54 F5.3 mag e_Bmag rms uncertainty on Bmag
56- 61 F6.3 mag Vmag Landolt V magnitude
63- 67 F5.3 mag e_Vmag rms uncertainty on Vmag
69- 74 F6.3 mag gmag Sloan g magnitude
76- 80 F5.3 mag e_gmag rms uncertainty on gmag
82- 87 F6.3 mag rmag Sloan magnitude
89- 93 F5.3 mag e_rmag rms uncertainty on rmag
95-100 F6.3 mag imag Sloan magnitude
102-106 F5.3 mag e_imag rms uncertainty on imag
108-113 F6.3 mag Rcmag Cousins R magnitude
115-120 F6.3 mag Icmag Cousins I magnitude
122-126 F5.3 mag B-V Landolt B-V colour index
128-129 I2 --- o_Bmag [4/24] Number of epochs in B band
131-132 I2 --- o_Vmag [4/24] Number of epochs in V band
134-135 I2 --- o_gmag [2/24] Number of epochs in g band
137-138 I2 --- o_rmag [2/24] Number of epochs in r band
140-141 I2 --- o_imag [1/24] Number of epochs in i band
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Acknowledgements:
Chris Sterken, csterken(at)vub.ac.be
(End) Patricia Vannier [CDS] 09-Dec-2014