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 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 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:
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FileName Lrecl Records Explanations
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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 83 6 Parameters of the candidates for Type II Cepheids
rrlyr.dat 85 45 Parameters of the RR Lyr stars
lpv.dat 62 31 Parameters of the long period variable (LPV) stars
wd.dat 78 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/* . 2 Individual photometry in I-band (subdirectory "I")
and V-band (subdirectory "V") for each star
spectra/* . 16 Individual spectra fo 16 stars
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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 2015AcA....65...63P ; arXiv:1503.03499).
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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
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Bytes Format Units Label Explanations
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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
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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 2015AcA....65...63P; arXiv:1503.03499));
T2CEP = Type II Cepheid candidates (6 objects)
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Byte-by-byte Description of file: t2cep.dat cep.dat
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Bytes Format Units Labels Description
--------------------------------------------------------------------------------
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
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Note (1):
* = Object OGLE-GD-CEP-0013 was spectroscopically confirmed
to be a Classical Cepheid (Pietrukowicz+ 2015AcA....65...63P 2015AcA....65...63P ;
arXiv:1503.03499). It probably pulsates in the first overtone
rather than fundamental mode.
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Byte-by-byte Description of file: rrlyr.dat lpv.dat
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Bytes Format Units Labels Description
--------------------------------------------------------------------------------
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)
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Byte-by-byte Description of file: dsct.dat wd.dat
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Bytes Format Units Labels Description
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1- 2 A2 --- n_Star [sp] sp: spectrum available from
Pietrukowicz+ 2015AcA....65...63P 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
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Note (1):
* = OGLE-GD-DSCT-0058 re-classified to BLAP (OGLE-BLAP-001)
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Byte-by-byte Description of file: unclass.dat
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Bytes Format Units Labels Description
--------------------------------------------------------------------------------
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
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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)
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Nomenclature Notes:
Objects are (Nos 1-71), (Nos 1-20),
(Nos 1-45), (Nos 1-31),
(Nos 1-6) and in Simbad.
History:
Downloaded from ftp://ftp.astrouw.edu.pl/ogle/ogle3/OIII-CVS/gd/
(End) Emmanuelle Perret [CDS] 17-Oct-2017