J/ApJS/203/32 Machine-learned ASAS Classification Cat. (MACC) (Richards+, 2012)
Construction of a calibrated probabilistic classification catalog: application
to 50k variable sources in the All-Sky Automated Survey.
Richards J.W., Starr D.L., Miller A.A., Bloom J.S., Butler N.R., Brink H.,
Crellin-Quick A.
<Astrophys. J. Suppl. Ser., 203, 32 (2012)>
=2012ApJS..203...32R 2012ApJS..203...32R
ADC_Keywords: Stars, variable ; Photometry
Keywords: catalogs - methods: data analysis - methods: statistical -
stars: variables: general - techniques: photometric
Abstract:
Here, we describe a process to produce a probabilistic classification
catalog of variability with machine learning from a multi-epoch
photometric survey. In addition to producing accurate classifications,
we show how to estimate calibrated class probabilities and motivate
the importance of probability calibration. We also introduce a
methodology for feature-based anomaly detection, which allows
discovery of objects in the survey that do not fit within the
predefined class taxonomy. Finally, we apply these methods to sources
observed by the All-Sky Automated Survey (ASAS, Cat. II/264), and
release the Machine-learned ASAS Classification Catalog (MACC), a 28
class probabilistic classification catalog of 50124 ASAS sources in
the ASAS Catalog of Variable Stars. We estimate that MACC achieves a
sub-20% classification error rate and demonstrate that the class
posterior probabilities are reasonably calibrated. MACC
classifications compare favorably to the classifications of several
previous domain-specific ASAS papers and to the ASAS Catalog of
Variable Stars, which had classified only 24% of those sources into
one of 12 science classes.
Description:
Since 2000 August, ASAS (All-Sky Automated Survey; Pojmanski, G.
1997AcA....47..467P 1997AcA....47..467P) has monitored bright stars (V<14mag) in the
entire available sky south of DEC<+28° from Las Campanas
Observatory. ASAS uses two small wide-field telescopes to monitor the
sky with V- and I-band filters.
We retrieved the ACVS (ASAS Catalogue of Variable Stars) data set by
first referencing the ACVS.1.1 catalog, which contains 50124 variable
stars, and individually retrieving the data for each source from the
ACVS Web site.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 353 50124 The Machine-learned ASAS Classification Catalog
table5.dat 51 49 Classification catalog results for classical
Cepheid stars confirmed by Berdnikov et al.
(2011, Cat. J/AZh/88/886)
table6.dat 52 18 Classification catalog results for β Cephei
stars in Pigulski (2005AcA....55..219P 2005AcA....55..219P)
table7.dat 52 19 Classification catalog results for Double-Mode
RR Lyrae stars in Szczygiel & Fabrycky (2007,
Cat. J/MNRAS/377/1263)
table8.dat 66 13 Classification catalog results for Orion belt
variables in Caballero et al. (2010AN....331..257C 2010AN....331..257C)
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See also:
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
J/MNRAS/427/2917 : Hipparcos variables automated classification (Rimoldini+,
2012)
J/MNRAS/414/2602 : Automated classification of HIP variables (Dubath+, 2011)
J/AZh/88/886 : BVIc photometry of Cepheids from ASAS-3 (Berdnikov+, 2011)
J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)
J/A+A/475/1159 : Supervised classification of variable stars (Debosscher+,
2007)
J/MNRAS/377/1263 : Multiperiodic RR Lyrae in ASAS catalog (Szczygiel+, 2007)
J/MNRAS/358/30 : Automated classification of ASAS variables (Eyer+, 2005)
J/AcA/48/35 : All Sky Automated Survey variable stars (Pojmamski 1998)
http://dotastro.org/ : Time Domain Astronomy Warehouse home page
http://www.bigmacc.info/ : MACC home page
http://www.astrouw.edu.pl/asas/ : All Sky Automated Survey home page
http://www.astrouw.edu.pl/asas/?page=acvs : ASAS Catalogue of Variable Stars
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- ASAS ASAS Identification (HHMMSS+DDMM.m; J2000)
15- 20 I6 --- ID [215153/265276] dotAstro.org ID number (1)
22- 31 F10.6 deg RAdeg ASAS Right ascension in decimal degrees (J2000) 2)
33- 42 F10.6 deg DEdeg ASAS Declination in decimal degrees (J2000) (2)
44- 60 A17 --- Class Classification of variable (G1)
62- 67 F6.4 --- PClass [0.09/1] Classification probability (G2)
69- 75 F7.4 --- Anom [0.0373/24] Anomaly score of variable, higher is
more anomalous
77-103 A27 --- AClass ASAS Catalog of Variable Stars classification (3)
105-121 A17 --- TClass Training class, if object is in training set
123-128 F6.4 --- Mira Probability of Mira
130-135 F6.4 --- SR Probability of semi-regular pulsating variable
137-142 F6.4 --- SRS-A Probability of small-amplitude red giant, Type A
144-149 F6.4 --- SRS-B Probability of small-amplitude red giant, Type B
151-156 F6.4 --- LSP Probability of Long Secondary Period variable
158-163 F6.4 --- RV Probability of RV Tauri-type
165-170 F6.4 --- DCEP Probability of classical Cepheid (δ Cep)
172-177 F6.4 --- DCEP-2 Probability of population II Cepheid
179-184 F6.4 --- CEP(B) Probability of multi-mode Cepheid
186-191 F6.4 --- RR-0 Probability of RR Lyrae, fundamental mode
193-198 F6.4 --- RR-1 Probability of RR Lyrae, first overtone
200-205 F6.4 --- RR(B) Probability of RR Lyrae, double mode
207-212 F6.4 --- DSCT Probability of δ Scuti type
214-219 F6.4 --- SXPHE Probability of SX Phoenicis type
221-226 F6.4 --- BCEP Probability of β Cephei type
228-233 F6.4 --- PulBe Probability of pulsating Be star
235-240 F6.4 --- RSG Probability of red supergiant
242-247 F6.4 --- CP Probability of chemically peculiar star
249-254 F6.4 --- RCB Probability of R Coronae Borealis
256-261 F6.4 --- CTT Probability of classical T Tauri star
263-268 F6.4 --- WTT Probability of weakline T Tauri star
270-275 F6.4 --- RS Probability of RS CVn type
277-282 F6.4 --- Ae/Be Probability of Herbig Ae/Be
284-289 F6.4 --- SDOR Probability of S Doradus type
291-296 F6.4 --- ELL Probability of ellipsoidal variable
298-303 F6.4 --- EA Probability of β Persei (Algol) (detached)
305-310 F6.4 --- EB Probability of β Lyrae (semi-detached)
312-317 F6.4 --- EW Probability of W Ursae Majoris (contact)
319-328 F10.5 d Per [0.03037/5500.06] Period
330-335 F6.3 --- Signi [0.395/37.909] Statistical significance of period
337-340 I4 --- Nep [3/2232] Number of ASAS epochs in the light curve
342-346 F5.2 mag Vmag [3.96/15.76] Median ASAS V band magnitude
348-353 F6.4 mag Vamp [0.04/4.71] Amplitude of V band ASAS variation
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Note (1): MACC catalog and classification features are also available for
download at http://www.bigmacc.info/
Note (2): Please note some odd coordinates 2 degrees around the South Celestial
Pole. Note added by CDS.
Note (3): Basic ASAS classes are:
EC = Eclipsing contact binaries
ESD = Eclipsing semi-detached binaries
ED = Eclipsing detached binaries
DSCT = δ Scuti variables
RRAB = RR Lyr variables (fundamental)
RRC = RR Lyr variables (first overtone)
DCEP = Cepheids (δ Cep); DCEP-FU for fundamental,
DCEP-FO for first overtone
ACV = α2 CVn variables
BCEP = β Cep variables
MIRA = Mira-type stars
MISC = Miscellaneous variables.
ACVS is available for download at
http://www.astrouw.edu.pl/asas/data/ACVS.1.1.gz
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Byte-by-byte Description of file: table5.dat table6.dat table7.dat table8.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- ASAS ASAS identification (HHMMSS+DDMM.m; J2000)
15- 32 A18 --- Class Our predicted classification (G1)
34- 38 F5.3 --- PClass Classification probability (G2)
40- 42 I3 --- Rank ? Ranking probability (not for table 8)
44- 48 F5.2 --- Anom Anomaly score
50- 52 A3 --- Train [Yes/No ] In training set?
54- 66 A13 --- CClass Caballero (2010AN....331..257C 2010AN....331..257C) classification
(only for table 8)
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Global notes:
Note (G1): Classification into one of 28 predefined classes of variable star
represented in the columns of table4:
Mira = Mira (ο Cet)
Semireg_PV = SR (semi-regular pulsating variable)
SARG_A = SRS-A (small-amplitude red giant, type A)
SARG_B = SRS-B (small-amplitude red giant, type B)
Beta_Cephei = BCEP (β Cephei type)
Beta_Lyrae = EB (semi-detached β Lyrae type)
Beta_Persei = EA (detached Algol type)
ChemPeculiar = CP (chemically peculiar star)
ClassT_Tauri = CTT (classical T Tau-type star)
Classical_Cepheid = classical Cepheid (δ Cep)
Delta_Scuti = DSCT (δ Scuti type)
Ellipsoidal = ELL (ellipsoidal variable)
Herbig_AEBE = Ae/Be (Herbig Ae/Be star)
LSP = Long Secondary Period variable
MultiMode_Cepheid = CEP(B) (multi-mode Cepheid)
PopII_Cepheid = DCEP-2 (population-II Cepheid)
Pulsating_Be = PulBe (pulsating Be star)
RCB = R Coronae Borealis-type
RRLyraeDM = RR(B) (RR Lyr variable, double mode)
RRLyraeFM = RR-0 (RR Lyr variable, fundamental mode)
RRLyraeFO = RR-1 (RR Lyr variable, first overtone)
RSG = red supergiant
RS_CVn = RS (RS CVn type variable)
RV_Tauri = RV (RV Tau type variable)
SX_Phe = SXPHE (SX Phe type variable)
S_Doradus = SDOR (S Dor eruptive variable)
WUrsaeMaj = EW (W UMa type contact eclipsing binary)
WeaklineTTauri = WTT (weak-line T Tau variable)
Note (G2): Posterior probability that the source is of the variability class
Class, given its observed ASAS data and NOMAD colors.
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History:
From electronic version of the journal
02-Jul-2013: Insert into VizieR
19-Jul-2018: VizieR coordinates for Table 4 directly retrieved from
ASAS (II/264) or from the ACVS online catalog
(http://www.astrouw.edu.pl/asas/?page=acvs)
for 194209-2846.2, 83218-2800.1 and 060516-4907.4 due to odd coordinates in
Table 4, 2 degrees around the South Celestial Pole.
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Dec-2012