J/MNRAS/402/691 SMC RR Lyrae stars light curve analysis (Deb+, 2010)
Physical parameters of the Small Magellanic Cloud RR Lyrae stars and the
distance scale.
Deb S., Singh H.P.
<Mon. Not. R. Astron. Soc., 402, 691-704 (2010)>
=2010MNRAS.402..691D 2010MNRAS.402..691D
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry
Keywords: methods: data analysis - astronomical data bases: miscellaneous -
stars: fundamental parameters - stars: variables: other -
Magellanic Clouds
Abstract:
We present a careful and detailed light curve analysis of RR Lyrae
stars in the Small Magellanic Cloud (SMC) discovered by the Optical
Gravitational Lensing Experiment (OGLE) project. Out of 536
single-mode RR Lyrae stars selected from the data base, we have
investigated the physical properties of 335 'normal-looking' RRab
stars and 17 RRc stars that have good quality photometric light
curves. We have also been able to estimate the distance modulus of the
cloud which is in good agreement with those determined from other
independent methods.
Description:
The RRL stars analysed in the present work were selected from the
high-quality photometric catalogue of RRL stars in the SMC from
OGLE-II data base (Soszynski et al., 2002AcA....52..369S 2002AcA....52..369S). The
catalogue contains B, V and I light curves of 58 RRc stars and 478
RRab stars located in the 11 areas close to the bar of the SMC in the
Johnson-Cousins photometric system.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 110 478 Fourier parameters for 478 fundamental mode (RRab)
SMC RR Lyr variables in the OGLE data base
(I-band data)
table2.dat 103 58 Fourier parameters for 58 overtone mode (RRc)
SMC RR Lyr variables in the OGLE data base
(I-band data)
table5.dat 97 335 Physical parameters extracted from Fourier
coefficients for 335 RRab variables
table6.dat 97 17 Physical parameters extracted from Fourier
coefficients for 17 RRc variables
--------------------------------------------------------------------------------
See also:
J/AJ/138/1661 : The Araucaria Project: RR Lyrae in SMC (Szewczyk+, 2009)
J/AcA/48/113 : OGLE RR Lyrae VI photometry (Udalski, 1998)
J/AcA/60/165 : VI light curves of SMC RR Lyrae (Soszynski+, 2010)
J/MNRAS/415/1366 : OGLE RR Lyrae in SMC (Kapakos+, 2011)
J/MNRAS/426/2063 : SMC RR Lyrae Fourier decomposition (Kapakos+, 2012)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [OGLE]
5- 22 A18 --- OGLE OGLE ID (HHMMSS.ss+DDMMSS.s)
24- 31 F8.6 d Per Period
34- 36 I3 --- Nobs Number of data points for each of the light
curves retained for the analysis after
removing the outliers
38- 42 F5.3 --- chi2 Reduced χ2ν
44- 48 F5.3 --- sig.fit σ fit
50- 54 F5.3 mag AI Amplitude in I-band
56- 61 F6.3 mag A0 Mean magnitude in I band
63- 67 F5.3 mag A1 First order Fourier coefficient A1
69- 73 F5.3 --- R21 Fourier amplitude ratio R21
75- 79 F5.3 --- R31 Fourier amplitude ratio R31
81- 85 F5.3 --- R41 Fourier amplitude ratio R41
87- 91 F5.3 rad phi21 [0/6.2832] Phase difference φ21
93- 97 F5.3 rad phi31 [0/6.2832] Phase difference φ31
99-103 F5.3 rad phi41 [0/6.2832] Phase difference φ41
105-110 F6.3 --- Dm Deviation parameter (1)
--------------------------------------------------------------------------------
Note (1): A deviation in a parameter F is the (O-C) difference expressed
in terms of σ, i.e. DF=(Fobs-Fcalc)/σF.
Dm represents a quality test on the regular behaviour of the shape
of the light curve; if the value is ≤5, the the shapes of the RRab
light curves are normal, and the physical parameters can be derived
(in table5)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [OGLE]
5- 22 A18 --- OGLE OGLE ID (HHMMSS.ss+DDMMSS.s)
24- 31 F8.6 d Per Period
34- 36 I3 --- Nobs Number of data points for each of the light
curves retained for the analysis after
removing the outliers
38- 42 F5.3 --- chi2 Reduced χ2ν
44- 48 F5.3 --- sig.fit σ fit
50- 54 F5.3 mag AI Amplitude in I-band
56- 61 F6.3 mag A0 Mean magnitude in I band
63- 67 F5.3 mag A4 Fourth order Fourier coefficient A4
69- 73 F5.3 --- R21 Fourier amplitude ratio R21
75- 79 F5.3 --- R31 Fourier amplitude ratio R31
81- 85 F5.3 --- R41 Fourier amplitude ratio R41
87- 91 F5.3 rad phi21 [0/6.2832] Phase difference φ21
93- 97 F5.3 rad phi31 [0/6.2832] Phase difference φ31
99-103 F5.3 rad phi41 [0/6.2832] Phase difference φ41
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- OGLE OGLE ID (HHMMSS.ss+DDMMSS.s)
20- 23 F4.2 mag VMAG Absolute V magnitude (1)
25- 28 F4.2 mag e_VMAG rms uncertainty on VMAG (3)
30- 33 F4.2 [Lsun] logL Luminosity (2)
35- 38 F4.2 [Lsun] e_logL rms uncertainty on logL (3)
40- 44 F5.2 [Sun] [Fe/H] Metallicity
46- 49 F4.2 [Sun] e_[Fe/H] rms uncertainty on [Fe/H] (3)
51- 54 I4 K Teff Effective temperature
56- 57 I2 K e_Teff rms uncertainty on Teff (3)
59- 62 F4.2 Msun Mass Mass
64- 67 F4.2 Msun e_Mass rms uncertainty on Mass (3)
69- 72 F4.2 [cm/s2] logg Surface gravity
74- 77 F4.2 [cm/s2] e_logg rms uncertainty on logg (3)
79- 82 F4.2 Rsun R.FD Star radius (from Fourier decomposition)
84- 87 F4.2 Rsun e_R.FD rms uncertainty on RadFD
89- 92 F4.2 Rsun R.M Star radius (from more fundamental relations
used by Marconi et al. (2005ApJ...623L.133M 2005ApJ...623L.133M))
94- 97 F4.2 Rsun e_R.M rms uncertainty on RadFD
--------------------------------------------------------------------------------
Note (1): For table6.dat, from Kovacs, 1998MmSAI..69...49K 1998MmSAI..69...49K
Note (2): For table6.dat, from Simon and Clement, 1993ApJ...410..526S 1993ApJ...410..526S
Note (3): Errors represent the uncertainties in the Fourier parameters.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 29-May-2013