J/AJ/147/70 Variability in TAOS I. 58 new variable stars (Ishioka+, 2014)
The Taiwanese-American Occultation Survey project stellar variability.
III. Detection of 58 new variable stars.
Ishioka R., Wang S.-Y., Zhang Z.-W., Lehner M.J., Alcock C., Axelrod T.,
Bianco F.B., Byun Y.-I., Chen W.P., Cook K.H., Kim D.-W., King S.-K.,
Lee T., Marshall S.L., Protopapas P., Rice J.A., Schwamb M.E., Wang J.-H.,
Wen C.-Y., Ngeow C.-C.
<Astron. J., 147, 70 (2014)>
=2014AJ....147...70I 2014AJ....147...70I
ADC_Keywords: Stars, variable ; Photometry
Keywords: stars: variables: Cepheids - stars: variables: delta Scuti -
stars: variables: general
Abstract:
The Taiwanese-American Occultation Survey project is designed for the
detection of stellar occultations by small-size Kuiper Belt Objects,
and it has monitored selected fields along the ecliptic plane by using
four telescopes with a 3deg2 field of view on the sky since 2005. We
have analyzed data accumulated during 2005-2012 to detect variable
stars. Sixteen fields with observations of more than 100 epochs were
examined. We recovered 85 variables among a total of 158 known
variable stars in these 16 fields. Most of the unrecovered variables
are located in the fields observed less frequently. We also detected
58 variable stars which are not listed in the International Variable
Star Index of the American Association of Variable Star Observers.
These variable stars are classified as 3 RR Lyrae, 4 Cepheid, 1
δ Scuti, 5 Mira, 15 semi-regular, and 27 eclipsing binaries
based on the periodicity and the profile of the light curves.
Description:
The Taiwanese-American Occultation Survey (TAOS) telescope system
consists of four (A, B, C, and D) 50cm telescopes, each equipped with
a 2k*2k CCD camera, yielding a field of view of about 3deg2, with
the plate scale of about 3arcsec/pixel. We have analyzed data
accumulated during 2005-2012 to detect variable stars. Sixteen fields
with observations of more than 100 epochs were examined.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 123 164 List of known variable stars in 16 TAOS fields
table6.dat 102 58 List of previously uncataloged variable stars
in 16 TAOS fields
table7.dat 87 41422 TAOS photometry catalog
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
I/322 : UCAC4 Catalogue (Zacharias+, 2012)
I/327 : Carlsberg Meridian Catalog 15 (CMC15) (CMC, 2011)
I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
J/AJ/139/2026 : TAOS variable stars (Mondal+, 2010)
J/AcA/52/129 : DIA OGLE2 candidate variable stars catalog (Wozniak+, 2002)
J/AJ/119/1901 : ROTSE all-sky surveys for variable stars (Akerlof+, 2000)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 --- TAOS Taiwanese-American Occultation Survey identifier
11- 22 A12 --- USNO USNO-B1.0 identifier (cat. I/284)
24- 44 A21 --- Name Star identifier (1)
46- 51 F6.3 mag Vmag [7.55/16.8]? The catalog V band magnitude (1)
52 A1 --- f_Per [N] No period is cataloged
54- 65 F12.8 d Per ? Catalog period (1)
67 A1 --- f_Amp [N] No amplitude is cataloged
69- 73 F5.3 mag Amp [0.003/4.9]? Catalog amplitude (1)
75- 83 A9 --- Type Variability type, as in GCVS (cat. B/gcvs) (1)
85- 87 I3 --- Ne [22/993]? Number of epochs
89 A1 --- f_Per1 [N] Object not detected as a variable candidate
91-102 F12.8 d Per1 ? TAOS period derived from discrete Fourier
transform (DFT, Deeming, 1975Ap&SS..36..137D 1975Ap&SS..36..137D;
see Section 3.2 for details). A blank means no
detection of meaningful period (2)
104 A1 --- f_Per2 [N] Object not detected as a variable candidate
106-117 F12.8 d Per2 ? TAOS period derived from Period Dispersion
Minimization (PDM, Stellingwerf,
1978ApJ...224..953S 1978ApJ...224..953S; see Section 3.2). A blank
means no detection of meaningful period (2)
119 A1 --- l_Amp2 [<>] Limit flag on Amp2
120-123 F4.2 mag Amp2 ? TAOS amplitude (when there is no TAOS period,
amplitude is derived using catalog period) (2)
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Note (1): From the International Variable Star Index (VSX, cat. B/vsx) of the
American Association of Variable Star Observers (AAVSO).
Note (2): The TAOS catalog was compiled from Tycho2 (cat. I/259), UCAC3
(Zacharias et al. 2009, cat. I/315; obsoleted by Zacharias et al. 2012,
cat. I/322), CMC14 (Carlsberg Meridian Catalog, cat. I/304; obsoleted by
cat. I/327), Two Micron All Sky Survey (2MASS, cat. II/246), GSC2.3
(Guide Star Catalog, Version 2.3.2, cat. I/305), and SDSS7 (cat. II/294;
obsoleted by cat. V/139).
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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- 9 F9.5 --- TAOS Taiwanese-American Occultation Survey identifier
11- 24 A14 --- USNO USNO-B1.0 identifier (cat. I/284)
26 A1 --- f_USNO [b] Identification in the GSC2.2.1 catalog
(cat. I/271)
28- 36 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
38- 47 F10.6 deg DEdeg Declination in decimal degrees (J2000)
49- 54 F6.3 mag Rmag [10.321/15.44] TAOS R-band magnitude
56- 58 I3 --- Ne [56/993] Number of observed epochs
60- 70 F11.7 d Per1 ? TAOS period derived from discrete Fourier
transform (DFT, Deeming 1975Ap&SS..36..137D 1975Ap&SS..36..137D; see
Section 3.2 for details)
72 A1 --- f_Per1 [N] Object not detected as a variable candidate
74- 85 F12.8 d Per2 ? TAOS period derived from Period Dispersion
Minimization (PDM, Stellingwerf,
1978ApJ...224..953S 1978ApJ...224..953S; see Section 3.2)
87 A1 --- f_Per2 [N] Object not detected as a variable candidate
89- 92 F4.2 mag Amp2 [0.05/4] TAOS amplitude of variability
94-102 A9 --- Type Variable classification based on the shape of
light curve, period, and amplitude (1)
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Note (1): Type of variable defined as follows:
D = Detached binary;
Dsct = δ Scuti;
L = Star for which we did not find likely period;
M = Mira;
OC = Overcontact binary;
SD = Semi-detached binary;
Pul = Pulsating star;
RR = RR Lyrae;
ELV = Ellipsoidal variable;
SR = Semi-regular;
sPul = Short-period pulsating star.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [TAOS]
5- 13 F9.5 --- TAOS Taiwanese-American Occultation Survey identifier
15- 27 F13.7 d MJD Modified Julian Date
29- 35 F7.4 mag [6.6792/16.0935] Median observed magnitude
37- 42 F6.3 mag magA [6.697/15.845]? Magnitude observed with telescope A
44- 49 F6.3 mag magB [6.665/15.991]? Magnitude observed with telescope B
51- 56 F6.3 mag magC [6.64/16.197]? Magnitude observed with telescope C
58- 63 F6.3 mag magD [6.628/15.767]? Magnitude observed with telescope D
65- 69 F5.3 mag e_magA ? Error in magA
71- 75 F5.3 mag e_magB ? Error in magB
77- 81 F5.3 mag e_magC ? Error in magC
83- 87 F5.3 mag e_magD ? Error in magD
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 09-Jan-2015