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J/AcA/63/379 OGLE-III variable stars in Galactic disk area (Pietrukowicz+, 2013)

Large variety of new pulsating stars in the OGLE-III Galactic disk fields. Pietrukowicz P., Dziembowski W.A., Mroz P., Soszynski I., Udalski A., Poleski R., Szymanski M.K., Kubiak M., Pietrzynski G., Wyrzykowski L., Ulaczyk K., Kozlowski S., Skowron J. <Acta Astron., 63, 379 (2013)> =2013AcA....63..379P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Galactic plane ; Photometry, VRI ; Spectroscopy Keywords: Galaxy: disk; Stars: variables: Cepheids; Stars: variables: delta Scuti; Stars: variables: RR Lyrae; Stars: variables: general; Astrophysics - Galaxy Astrophysics; Astrophysics - Solar and Stellar Astrophysics Abstract: We present the results of a search for pulsating stars in the 7.12deg2 OGLE-III Galactic disk area in the direction tangent to the Centaurus Arm. We report the identification of 20 Classical Cepheids, 45 RR Lyr type stars, 31 Long-Period Variables, such as Miras and Semi-Regular Variables, one pulsating white dwarf, and 58 very likely δ Sct type stars. Based on asteroseismic models constructed for one quadruple-mode and six triple-mode δ Sct type pulsators, we estimated masses, metallicities, ages, and distance moduli to these objects. The modeled stars have masses in the range 0.9-2.5M and are located at distances between 2.5kpc and 6.2kpc. Two triple-mode and one double-mode pulsators seem to be Population II stars of the SX Phe type, probably from the Galactic halo. Our sample also includes candidates for Type II Cepheids and unclassified short-period (P<0.23d) multi-mode stars which could be either δSct or βCep type stars. One of the detected variables is a very likely δ Sct star with an exceptionally high peak-to-peak I-band amplitude of 0.35mag at the very short period of 0.0196d. All reported pulsating variable stars but one object are new discoveries. They are included in the OGLE-III Catalog of Variable Stars. Finally, we introduce the on-going OGLE-IV Galactic Disk Survey, which covers more than half of the Galactic plane. For the purposes of future works on the spiral structure and star formation history of the Milky Way, we have already compiled a list of known Galactic Classical Cepheids. Description: Observations presented in this paper were collected with the 1.3-m Warsaw telescope at Las Campanas Observatory, Chile, during the third phase of the Optical Gravitational Lensing Experiment (OGLE-III) in years 2001-2009. 21 fields in the direction tangent to the Centaurus Arm of the Galactic disk were observed. A significant majority of frames (815-2698 per field) were collected in the standard I-band filter with an exposure time of 120s or 180s. Additional observations, consisting of only 3-8 measurements, were taken in the V -band filter with an exposure time of 240s. 13 δSct objects (from OGLE-GD-DSCT-0059 to OGLE-GD-DSCT-0071) are added after the spectroscopic follow-up described in Pietrukowicz+ (2015AcA....65...63P ; arXiv:1503.03499)). The spectra were obtained with the 2.5-m Irenee du Pont telescope at Las Campanas Observatory on two nights, April 27/28 and April 28/29, 2014. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ident.dat 102 174 Identification of stars cep.dat 107 20 Parameters of the OGLE-III Galactic disk Cepheids t2cep.dat 107 6 Parameters of the candidates for Type II Cepheids rrlyr.dat 85 45 Parameters of the RR Lyr stars lpv.dat 85 31 Parameters of the long period variable (LPV) stars wd.dat 216 1 Parameters of the pulsating white dwarf dsct.dat 216 71 Parameters of the delta Scuti stars unclass.dat 184 48 *Unclassified short-period pulsating variables identified in 21 OGLE-III Galactic disk fields phot/* 0 2 Individual photometry in I-band (subdirectory "I") and V-band (subdirectory "V") for each star spectra/* 0 16 Individual spectra fo 16 stars
Note on unclass.dat: The list of unclassified pulsating stars was shortened from 60 to 48 objects after a spectroscopic follow-up described in Pietrukowicz+ (2015AcA....65...63P ; arXiv:1503.03499).
Description of file: In phot/ and spectra/ directories, I- and V-band photometry and low-resolution spectra of some objects (for delta Scuti stars and CEP 13) are provided as in the original FTP (ftp://ftp.astrouw.edu.pl/ogle/ogle3/OIII-CVS/gd/). See also: B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014) II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005) J/AcA/48/35 : All Sky Automated Survey variable stars (Pojmamski 1998) J/A+AS/144/469 : Delta Scuti stars (Rodriguez+, 2000) J/A+A/389/149 : EROS II periodic stars towards Galactic spiral arm (Derue+, 2002) J/AJ/128/1167 : ARAUCARIA project : NGC 300 Cepheids. II (Gieren+, 2004) J/ApJS/158/193 : Catalog of Galactic β Cephei stars (Stankov+, 2005) J/AJ/132/1202 : RR Lyrae in Northern Sky Variability Survey (Kinemuchi+, 2006) J/ApJ/678/865 : LONEOS-I RR Lyrae stars (Miceli+, 2008) J/AcA/58/313 : LMC Cepheids in OGLE and MACHO data (Poleski+, 2008) J/AcA/58/163 : VI light curves of LMC classical Cepheids (Soszynski+, 2008) J/other/PZP/9.5 : I light curves of RR Lyrae from OGLE II (Bernhard+, 2009) J/AJ/137/3198 : New samples of BHB stars in the Milky Way (Kinman+, 2009) J/AcA/59/137 : ASAS Galactic RR Lyrae stars (Szczygiel+, 2009) J/AcA/60/17 : VI light curves of SMC classical Cepheids (Soszynski+, 2010) J/AcA/60/1 : VI light curves of LMC delta Scuti stars (Poleski+, 2010) J/AcA/60/295 : VI photometry of Galactic disk field stars (Szymanski+, 2010) J/AcA/61/285 : VI light curves of Galactic Bulge Cepheids (Soszynski+, 2011) J/AcA/61/1 : VI light curves of Galactic Bulge RR Lyrae (Soszynski+, 2011) J/AJ/142/51 : Galactic Cepheids abundance variations (Luck+, 2011) J/MNRAS/427/3374 : QUEST RR Lyrae Survey III. Low Galactic lat. (Mateu+, 2012) J/MNRAS/424/2528 : RR Lyrae in SDSS Stripe 82 (Suveges+, 2012) J/ApJ/756/23 : RR Lyrae V-band photom. follow-up from SEKBO (Akhter+, 2012) J/AcA/63/135 : New OGLEIII dwarf novae in Galactic disk (Mroz+, 2013) J/AcA/63/115 : OGLE-III Galactic disk EBs (Pietrukowicz+, 2013) J/AcA/63/21 : VI light curves of Galactic LPVs (Soszynski+, 2013) J/AcA/63/159 : LMC OGLE-III Shallow Survey variable stars (Ulaczyk+, 2013) http://ogle.astrouw.edu.pl/ : OGLE home page Byte-by-byte Description of file: ident.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Var Type of variable (1) 7- 24 A18 --- Star Star's ID in the form OGLE-GD-{Var}-NNNN 26- 33 A8 --- Field OGLE-III field 35- 40 I6 --- OGLE [2/101753] OGLE-III database number 42- 51 A10 --- Mode/Type Mode(s) of pulsation or subtypes (G1) 55- 56 I2 h RAh [10/13] Hour of right ascension (J2000) 58- 59 I2 min RAm Minute of right ascension (J2000) 61- 65 F5.2 s RAs Second of right ascension (J2000) 67 A1 --- DE- [-] Sign of declination (J2000) 68- 69 I2 deg DEd [60/65] Degree of declination (J2000) 71- 72 I2 arcmin DEm Arcminute of declination (J2000) 74- 77 F4.1 arcsec DEs Arcsecond of declination (J2000) 79-102 A24 --- OName Other designation
Note (1): Variable as follows: CEP = classical Cepheids (20 objects); RRLYR = RR Lyr type stars (45 objects); LPV = long-period variables (31 objects); WD = pulsating white dwarf (1 object); DSCT = δ Sct type stars (71 objects -- This list of delta Sct stars was extended by 13 objects (from OGLE-GD-DSCT-0059 to OGLE-GD-DSCT-0071) after a spectroscopic follow-up described in Pietrukowicz+ (2015AcA....65...63P; arXiv:1503.03499)); T2CEP = Type II Cepheid candidates (6 objects)
Byte-by-byte Description of file: t2cep.dat cep.dat
Bytes Format Units Label Explanations
1- 18 A18 --- Star Star's ID in the form OGLE-GD-{Var}-NNNN 19 A1 --- f_Star [*] Flag on Star (1) 21- 26 F6.3 mag Imax [13/19] Maximum I-band magnitude 28- 33 F6.3 mag Imin [13.7/19.3] Minimum I-band magnitude 35- 40 F6.3 mag Vmag [14.9/21.7]?=99.999 Intensity mean V-band magnitude 42- 47 F6.3 mag V-I [1.1/4.2]?=99.999 Mean V-I color index 49- 54 F6.3 mag Imag [13.4/19.1] Intensity mean I-band magnitude 57- 61 A5 --- Mode/T Mode(s) of pulsation or subtypes (G1) 64- 74 F11.8 d Per [0.5/35.2] Period (primary) 77- 86 F10.8 d e_Per [/0.03] Uncertainty of the (primary) period 89- 97 F9.7 d Per2 ? Secondary period (if exists) 99-107 F9.7 d e_Per2 ? Uncertainty of the secondary period
Note (1): * = Object OGLE-GD-CEP-0013 was spectroscopically confirmed to be a Classical Cepheid (Pietrukowicz+ 2015AcA....65...63P ; arXiv:1503.03499). It probably pulsates in the first overtone rather than fundamental mode.
Byte-by-byte Description of file: rrlyr.dat lpv.dat
Bytes Format Units Label Explanations
1- 18 A18 --- Star Star's ID in the form OGLE-GD-{Var}-NNNN 21- 26 F6.3 mag Imax [11.3/19.7] Maximum I-band magnitude 28- 33 F6.3 mag Imin [13.4/20.4] Minimum I-band magnitude 35- 40 F6.3 mag Vmag [14.8/22.4]?=99.999 Intensity mean V-band magnitude 42- 47 F6.3 mag V-I [0.8/7.6]?=99.999 Mean V-I color index 49- 54 F6.3 mag Imag [13.2/20.1] Intensity mean I-band magnitude 57- 69 F13.8 d Per [0.2/1172] Pulsation Period (0.2-0.8 for RR Lyr; 105-1172 for LPVs) 72- 81 F10.8 d e_Per ? Uncertainty of the pulsation period 84- 85 I2 d BP [35/90]? Period of the Blazhko effect (if exists)
Byte-by-byte Description of file: dsct.dat wd.dat
Bytes Format Units Label Explanations
1- 2 A2 --- n_Star [sp] sp: spectrum available from Pietrukowicz+ 2015AcA....65...63P 4- 21 A18 --- Star Star's ID in the form OGLE-GD-{Var}-NNNN 22 A1 --- f_Star [*] Flag on Star (1) 24- 29 F6.3 mag Vmag [13.7/21.6]?=99.999 Intensity mean V-band magnitude 31- 36 F6.3 mag V-I [-0.3/2.3]?=99.999 Mean V-I color index 38- 43 F6.3 mag Imag [13.1/20.3] Intensity mean I-band magnitude 46- 55 A10 --- Mode Mode(s) of pulsation (G1) 58- 67 F10.8 d Per [0.01/0.4] Period (primary) 69- 78 F10.8 d e_Per Uncertainty of the (primary) period 81- 90 F10.8 d Per2 ? Period (secondary, if exists) 92-101 F10.8 d e_Per2 ? Uncertainty of the (secondary) period 104-113 F10.8 d Per3 ? Period (tertiary, if exists) 115-124 F10.8 d e_Per3 ? Uncertainty of the (tertiary) period 127-136 F10.8 d Per4 ? Period (4th, if exists) 138-147 F10.8 d e_Per4 ? Uncertainty of the (4th) period 150-159 F10.8 d Per5 ? Period (5th, if exists) 161-170 F10.8 d e_Per5 ? Uncertainty of the (5th) period 173-182 F10.8 d Per6 ? Period (6th, if exists) 184-193 F10.8 d e_Per6 ? Uncertainty of the (6th) period 196-205 F10.8 d Per7 ? Period (7th, if exists) 207-216 F10.8 d e_Per7 ? Uncertainty of the (7th) period
Note (1): * = OGLE-GD-DSCT-0058 re-classified to BLAP (OGLE-BLAP-001)
Byte-by-byte Description of file: unclass.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Field OGLE-III field 10- 15 I6 --- OGLEIIIi [18/82805] OGLE-III database number in the I-band 17- 22 I6 --- OGLEIIIv ? OGLE-III database number in the V-band 25- 26 I2 h RAh [10/13] Hour of right ascension (J2000) 28- 29 I2 min RAm Minute of right ascension (J2000) 31- 35 F5.2 s RAs Second of right ascension (J2000) 37 A1 --- DE- [-] Sign of declination (J2000) 38- 39 I2 deg DEd [60/65] Degree of declination (J2000) 41- 42 I2 arcmin DEm Arcminute of declination (J2000) 44- 47 F4.1 arcsec DEs Arcsecond of declination (J2000) 50- 55 F6.3 mag Vmag [14.4/20.7]?=99.999 Intensity mean V-band magnitude 57- 62 F6.3 mag V-I [0.6/1.8]?=99.999 Mean V-I color index 64- 69 F6.3 mag Imag [13.7/19.1] Intensity mean I-band magnitude 72- 81 F10.8 d Per [0.04/0.3] Period (primary) 83- 92 F10.8 d e_Per Uncertainty of the (primary) period 95-104 F10.8 d Per2 ? Period (secondary, if exists) 106-115 F10.8 d e_Per2 ? Uncertainty of the (secondary) period 118-127 F10.8 d Per3 ? Period (tertiary, if exists) 129-138 F10.8 d e_Per3 ? Uncertainty of the (tertiary) period 141-150 F10.8 d Per4 ? Period (4th, if exists) 152-161 F10.8 d e_Per4 ? Uncertainty of the (4th) period 164-173 F10.8 d Per5 ? Period (5th, if exists) 175-184 F10.8 d e_Per5 ? Uncertainty of the (5th) period
Global Notes: Note (G1): Mode(s) of pulsation for CEP and DSCT (F=Fundamental, 1O=first overtone, 2O=second overtone, ...) or Subtype of LPVs (Mira, "SRV":semi-regular variables); RR Lyr stars (RRab, RRc) and Type II Cepheids (WVir, pWVir, RVTau)
Nomenclature Notes: Objects are <OGLE GD-DSCT-NNNN> (Nos 1-71), <OGLE GD-CEP-NNNN> (Nos 1-20), <OGLE GD-RRLYR-NNNN> (Nos 1-45), <OGLE GD-LPV-NNNN> (Nos 1-31), <OGLE GD-T2CEP-NNNN> (Nos 1-6) and <OGLE GD-WD-0001> in Simbad. History: Downloaded from ftp://ftp.astrouw.edu.pl/ogle/ogle3/OIII-CVS/gd/
(End) Emmanuelle Perret [CDS] 17-Oct-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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