J/MNRAS/445/1584 AB-type RR Lyrae stars from ASAS and WASP (Skarka, 2014)
Characteristics of bright AB-type RR Lyrae stars from the ASAS and WASP surveys.
Skarka M.
<Mon. Not. R. Astron. Soc., 445, 1584-1597 (2014)>
=2014MNRAS.445.1584S 2014MNRAS.445.1584S
ADC_Keywords: Stars, variable ; Magnitudes, absolute ; Effective temperatures
Keywords: methods: data analysis - techniques: photometric -
stars: horizontal branch - stars: variables: RR Lyrae
Abstract:
In this article, we present results based on high-density,
high-precision Wide-Angle Search for Planets (WASP) light curves
supplemented with lower-precision photometry from the All-Sky
Automated Survey (ASAS) for 268 RR Lyrae stars (176 regular, 92
Blazhko). Light curves were Fourier-decomposed and coefficients from
WASP were transformed to the ASAS standard using 24 common stars.
Coefficients were then compared with similar data from Galactic
globular clusters, the Galactic bulge and the Large and Small
Magellanic Clouds (LMC and SMC). Using Fourier coefficients, we also
calculated physical parameters via standard equations from the
literature. We confirmed the results of previous authors, including
lower amplitudes and longer rise times for Blazhko stars. It was found
that in the R31 versus R21 plot the location of a star
depends mainly on its metallicity and that Blazhko stars prefer a
different location from modulation-free stars. Field and globular
cluster RR Lyrae variables have a different φ21 and φ31 from
stars in the LMC, SMC and Galactic bulge. Although there are some weak
indications that Blazhko stars could tend towards a slightly lower
metallicity and shorter periods, no convincing proof was found. The
most interesting highlight is the identification of a very recently
proposed new group of metal-rich RR Lyrae type stars. These
low-luminosity, metal-strong variables, comprising both Blazhko and
regular stars, have shorter periods and about 180K higher temperature
at constant (B-V)0 than the rest of the stars in the
sample.
Description:
The crucial part of our analysis, focused on stars from the Galactic
field, is based on data from the WASP and ASAS data bases. As an
extension, we also compiled and utilized available data of stars from
globular clusters (hereafter GC), the LMC, SMC and GB and compared
their light-curve parameters with those from our basic data set.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 73 274 Fourier parameters of fundamental mode RR Lyrae
variables located in globular clusters
table3.dat 160 268 Parameters of sample stars
--------------------------------------------------------------------------------
See also:
J/AJ/113/1711 : RR Lyrae in NGC 6171 (Clement+ 1997)
J/A+A/371/579 : Empirical relations for cluster RR Lyrae (Kovacs+, 2001)
J/MNRAS/384/1444 : Vr light curves of NGC 5466 RR Lyrae (Arellano Ferro+, 2008)
J/A+A/507/803 : VI photometry of new M53 variables (Dekany+, 2009)
J/AJ/140/1766 : RR Lyrae in M62 (NGC6266) (Contreras+, 2010)
J/MNRAS/416/2265 : Variable stars in NGC 5024 (M53) (Arellano Ferro+, 2011)
J/MNRAS/419/2173 : Long-term photometry of M3 RR Lyrae (Jursik+, 2012)
J/MNRAS/434/1220 : Vi light curves of NGC6333 variables (Arellano Ferro+, 2013)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Cluster Cluster name
10- 14 A5 --- VName Variable name within the cluster
17 A1 --- Bl [±] Blazhko modulation present (+) or not (-)
20- 25 F6.4 d Per [0.3/0.9] Period
28- 32 F5.3 mag A1 [0.070.5]? Fourier first-component amplitude
41- 45 F5.3 --- R21 [0.1/0.6]? Fourier amplitude ratio R21
49- 53 F5.3 --- R31 [0/0.5]? Fourier amplitude ratio R31
57- 61 F5.3 rad phi21 [0/3.14] Fourier phase parameter φ21
65- 69 F5.3 rad phi31 [0/3.14] Fourier phase parameter φ31
73 I1 --- Ref Reference (1)
--------------------------------------------------------------------------------
Note (1): References as follows:
1 = Clement & Shelton, 1997, Cat. J/AJ/113/1711
2 = Walker, 1998AJ....116..220W 1998AJ....116..220W
3 = Kovacs & Walker, 2001, Cat. J/A+A/371/579
4 = Arellano Ferro et al., 2008, Cat. J/MNRAS/384/1444
5 = Dekany & Kovacs 2009, Cat. J/A+A/507/803
6 = Arellano Ferro et al., 2013, Cat. J/MNRAS/434/1220
7 = Jurcsik et al., 2012, Cat. J/MNRAS/419/2173
8 = Arellano Ferro et al., 2011, Cat. J/MNRAS/416/2265
9 = Contreras et al., 2010, J/AJ/140/1766
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Star Star name
19 A1 --- n [wa] WASP (w) or ASAS (a) data origin
21- 30 F10.8 d Per [0.2/0.9] Period
32- 40 F9.8 d e_Per [2e-8/1e-5] rms uncertainty on Per
42- 47 F6.4 mag A1 [0.1/0.5] Fourier first-component amplitude
49- 53 F5.4 mag e_A1 [0.0002/0.05] rms uncertainty on A1
55- 60 F6.4 --- R21 [0.2/0.6] Fourier amplitude ratio R21
62- 66 F5.4 --- e_R21 rms uncertainty on R21
68- 72 F5.3 --- R31 [0/0.4] Fourier amplitude ratio R31
74- 77 F4.3 --- e_R31 rms uncertainty on R31
79- 83 F5.3 rad phi21 [0/3.14] Fourier phase parameter φ21
85- 88 F4.3 rad e_phi21 rms uncertainty on φ21
90- 94 F5.3 rad phi31 [0/3.14] Fourier phase parameter φ31
96- 99 F4.3 rad e_phi31 rms uncertainty on φ31
101-104 F4.2 mag Atot [0.3/1.5] Total mean amplitude
106-109 F4.2 --- RT [0.1/0.5] Rise-time in phase unit
111-115 F5.2 [Sun] [Fe/H] [-2.2/0.4] Metallicity
117-119 F3.2 [Sun] e_[Fe/H] [0.1/0.5] rms uncertainty on [Fe/H]
121-124 F4.2 mag VMAG [0.2/1] Absolute V magnitude
126-128 F3.2 mag e_VMAG [0.1/0.12] rms uncertainty on VMAG
130-133 I4 K Teff [6057/7071] Effective temperature
135-138 I4 K e_Teff rms uncertainty on Teff
140-144 F5.3 mag (B-V)0 [0.27/0.42] Deredenned B-V colour index
146-149 F4.3 mag e_(B-V)0 rms uncertainty on (B-V)0
151-154 F4.2 Msun Mass [0.45/0.64] Mass
156-158 F3.2 Msun e_Mass [0.02/0.03] rms uncertainty on Mass
160 A1 --- Bl [±] Blazhko modulation present (+) or not (-)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-May-2015