J/AcA/58/293 Type-II and anomalous Cepheids in LMC (Soszynski+, 2008)
The Optical Gravitational Lensing Experiment. The OGLE-III catalog of variable
stars.
II. Type II Cepheids and Anomalous Cepheids in the Large Magellanic Cloud.
Soszynski I., Udalski A., Szymanski M.K., Kubiak M., Pietrzynski G.,
Wyrzykowski L., Szewczyk O., Ulaczyk K., Poleski R.
<Acta Astron. 58, 293 (2008)>
=2008AcA....58..293S 2008AcA....58..293S
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Magnitudes
Keywords: Cepheids - stars: oscillations - stars: population II -
Magellanic Clouds
Abstract:
In the second part of the OGLE-III Catalog of Variable Stars
(OIII-CVS) we present 197 type II Cepheids and 83 anomalous Cepheids
in the Large Magellanic Cloud (LMC). The sample of type II Cepheids
consists of 64 BL Her stars, 96 W Vir stars and 37 RV Tau stars.
Anomalous Cepheids are divided into 62 fundamental-mode and 21
first-overtone pulsators. These are the largest samples of such types
of variable stars detected anywhere outside the Galaxy.
Description:
We present the period-luminosity and color-magnitude diagrams of stars
in the sample. If the boundary period between BL Her and W Vir stars
is adopted at 4 days, both groups differ significantly in (V-I)
colors. We identify a group of 16 peculiar W Vir stars with different
appearance of the light curves, brighter and bluer than ordinary stars
of that type. Four of these peculiar W Vir stars show additional
eclipsing modulation superimposed on the pulsation light curves. Four
other stars of that type show long-period secondary variations which
may be ellipsoidal modulations. It suggests that peculiar W Vir
subgroup may be related to binarity. In total, we identified seven
type II Cepheids simultaneously exhibiting eclipsing variations which
is a very large fraction compared to classical Cepheids in the LMC.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalog.dat 200 286 Catalog of type II and anomalous Cepheids in the
Large Magellanic Cloud
remarks.dat 70 30 Remarks
--------------------------------------------------------------------------------
See also:
ftp://ftp.astrouw.edu.pl/ogle/ogle3/OIII-CVS/lmc : OGLE-III Home Page
J/AcA/58/163 : VI light curves of LMC classical Cepheids (Soszynski+, 2008)
J/AcA/59/1 : VI light curves of LMC RR Lyrae (Soszynski+, 2009)
J/AcA/58/269 : VI light curves of LMC long-period variables (Soszynski+, 2009)
J/AcA/59/335 : VI light curves of LMC R CBr stars (Soszynski+, 2009)
J/AcA/60/1 : LMC delta Scuti stars VI light curves (Poleski+, 2010)
J/AcA/60/17 : VI light curves of SMC classical Cepheids (Soszynski+, 2010)
J/AcA/60/91 : VI light curves of SMC type II Cepheids (Soszynski+, 2010)
J/AcA/60/165 : VI light curves of SMC RR Lyrae (Soszynski+, 2010)
J/AcA/60/179 : LMC double periodic variables VI light curves (Poleski+, 2011)
J/AcA/61/1 : VI light curves of Galactic Bulge RR Lyrae (Soszynski+, 2011)
J/AcA/61/103 : VI light curves of LMC eclipsing binaries (Szymanski+, 2011)
J/AcA/61/217 : VI light curves of SMC long-period variables (Soszynski+, 2011)
J/AcA/61/285 : VI light curves of Galactic Bulge Cepheids (Soszynski+, 2011)
Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- --- [OGLE-LMC-]
10- 18 A9 --- Star Cepheid ID (T2CEP-NNNN or ACEP-NNN)
21- 28 A8 --- Field OGLE-III field (LMCNNN.N)
30- 35 I6 --- OGLE OGLE-III database number
38- 42 A5 --- Type Subtype of Cepheids (1)
44- 45 I2 h RAh Right ascension, equinox J2000.0 (hours)
47- 48 I2 min RAm Right ascension, equinox J2000.0 (minutes)
50- 54 F5.2 s RAs Right ascension, equinox J2000.0 (seconds)
56 A1 --- DE- Declination, equinox J2000.0 (sign)
57- 58 I2 deg DEd Declination, equinox J2000.0 (degrees)
60- 61 I2 arcmin DEm Declination, equinox J2000.0 (arc minutes)
63- 66 F4.1 arcsec DEs Declination, equinox J2000.0 (arc seconds)
68- 73 F6.3 mag <Imag> Intensity mean I-band magnitude
75- 80 F6.3 mag <Vmag> ?=- Intensity mean V-band magnitude
82- 92 F11.7 d Per Period
94-102 F9.7 d e_Per Uncertainty of period
105-114 F10.5 d Tmax Time of maximum brightness (HJD-2450000)
117-121 F5.3 mag Iamp I-band amplitude (maximum-minimum)
124-128 F5.3 --- R21 Fourier coefficient R_21
130-134 F5.3 rad phi21 ?=- Fourier coefficient φ_21
137-141 F5.3 --- R31 Fourier coefficient R_31
143-147 F5.3 rad phi31 ?=- Fourier coefficient φ_31
149-163 A15 --- OGLE-II OGLE-II ID (LMCSCNNNNNNN)
165-178 A14 --- MACHO MACHO ID (NN.NNNN.NNNN)
180-184 A5 --- GCVS GCVS ID number
186-200 A15 --- ONames Other designation
--------------------------------------------------------------------------------
Note (1): Subtypes as:
* 10 or F for anomalous Cepheids,
* BLHer, WVir, pWVir or RVTau for type II Cepheids
--------------------------------------------------------------------------------
Byte-by-byte Description of file: remarks.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- --- [OGLE-LMC-]
10- 18 A9 --- Star Cepheid ID (T2CEP-NNNN or ACEP-NNN)
20- 70 A51 --- Rem Remark
--------------------------------------------------------------------------------
History:
Copied at ftp://ftp.astrouw.edu.pl/ogle/ogle3/OIII-CVS/lmc/acep and
ftp://ftp.astrouw.edu.pl/ogle/ogle3/OIII-CVS/lmc/t2cep
References:
Soszynski et al., Paper I 2008AcA....58..163S 2008AcA....58..163S, Cat. J/AcA/58/163
Soszynski et al., Paper III 2009AcA....59....1S 2009AcA....59....1S, Cat. J/AcA/59/1
Soszynski et al., Paper IV 2009AcA....59..239S 2009AcA....59..239S, Cat. J/AcA/59/239
Soszynski et al., Paper V 2009AcA....59..335S 2009AcA....59..335S, Cat. J/AcA/59/335
Poleski et al., Paper VI 2010AcA....60....1P 2010AcA....60....1P, Cat. J/AcA/60/1
Soszynski et al., Paper VII 2010AcA....60...17S 2010AcA....60...17S, Cat. J/AcA/60/17
Soszynski et al., Paper VIII 2010AcA....60...91S 2010AcA....60...91S, Cat. J/AcA/60/91
Soszynski et al., Paper IX 2010AcA....60..165S 2010AcA....60..165S, Cat. J/AcA/60/165
Poleski et al., Paper X 2010AcA....60..179P 2010AcA....60..179P, Cat. J/AcA/60/179
Soszynski et al., Paper XI 2011AcA....61....1S 2011AcA....61....1S, Cat. J/AcA/61/1
Soszynski et al., Paper XII 2011AcA....61..103S 2011AcA....61..103S, Cat. J/AcA/61/103
Soszynski et al., Paper XIII 2011AcA....61..217S 2011AcA....61..217S, Cat. J/AcA/61/217
Soszynski et al., Paper XXIV 2011AcA....61..285S 2011AcA....61..285S, Cat. J/AcA/61/285
(End) Patricia Vannier [CDS] 28-Jan-2010