J/AJ/139/2014 BV light curves of 11 RR Lyrae (Kinman+, 2010)
Low-amplitude variables: distinguishing RR Lyrae stars from eclipsing binaries.
Kinman T.D., Brown W.R.
<Astron. J., 139, 2014-2025 (2010)>
=2010AJ....139.2014K 2010AJ....139.2014K
ADC_Keywords: Stars, variable ; Photometry, CCD ; Photometry, UBV
Keywords: Galaxy: halo - Galaxy: structure - stars: horizontal-branch -
stars: individual (RR Lyrae)
Abstract:
It is not easy to identify and classify low-amplitude variables, but
it is important that the classification is done correctly. We use
photometry and spectroscopy to classify low-amplitude variables in a
246deg2 part of the Akerlof et al. (2000, Cat. J/AJ/119/1901) field.
Akerlof and Collaborators found that 38% of the RR Lyrae stars in
their 2000deg2 test field were RR1 (type c). This suggests that these
RR Lyrae stars belong to an Oosterhoff Type II population, while their
period distribution is primarily Oosterhoff Type I. Our observations
support their RR0 (type ab) classifications; however, six of the seven
stars that they classified as RR1 (type c) are eclipsing binaries. Our
classifications are supported by spectroscopic metallicities,
line-broadening, and Galactic rotation measurements. Our 246deg2
field contains 16 RR Lyrae stars that are brighter than mR=14.5;
only four of these are RR1 (type c). This corresponds to an Oosterhoff
Type I population in agreement with the period distribution.
Description:
We first observed the variables in Table 2 on 9 nights of a 12 night
run with the 42 inch John S. Hall telescope of the Lowell Observatory
using the Kron aperture photometer and a thermoelectrically cooled EMI
6256 photomultiplier. Landolt standards (Landolt 1992) were observed
nightly so that the V and (B-V) are on the Johnson system.
We obtained further photometric observations between 2004 and 2009
using the commercial robotic f/7 0.8m Ritchey-Chretien telescope of
the Tenagra Observatory in Arizona.
The photoelectric data of 2002 are given in Table 3 and the Tenagra
photometric data are given in Table 4.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 21 ROTSE1 RR Lyrae variables that are identified in
the GCVS
table2.dat 71 11 ROTSE1 RR Lyrae variables that are not identified
in the GCVS
table3.dat 52 126 Photoelectric photometry of ROTSE1 variables
in Table 2
table4.dat 50 84 Tenagra CCD photometry of 6 ROTSE1 variables
in Table 2
table56.dat 124 11 Spectroscopic data and derived photometric and
spectroscopic properties for stars in Table 2
(tables 5 & 6 of the papar)
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- ROTSE1 ROTSE1 designation (JHHMMSS.ss+DDMMSS.s)
21- 24 A4 --- Type RR Lyrae type (G1)
26- 32 F7.5 d Per Period
34- 38 F5.2 mag Wmag Unfiltered CCD mean magnitude of variable
40- 42 F3.1 mag Amp Unfiltered CCD amplitude of variable
44- 49 A6 --- Name Identification in GCVS
51- 54 A4 --- Type2 Variable type given in GCVS
56- 62 F7.5 d Per2 Period given in GCVS
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- ROTSE1 ROTSE1 designation (JHHMMSS.ss+DDMMSS.s)
21- 24 A4 --- RRt RR Lyrae type (G1)
26- 32 F7.5 d Per Period
34- 40 F7.5 d e_Per rms uncertainty on Per
42- 51 F10.4 d JDmax Julian Date of maximum light (+2400000)
53- 55 F3.1 --- D Accumulated phase error after 3 years
57- 61 F5.2 mag Wmag Unfiltered CCD mean magnitude of variable
63- 65 F3.1 mag Amp Unfiltered CCD amplitude of variable
67 I1 --- Qual Quality on scale 10 (excellent) downward
69 I1 --- Note ? Individual Notes and other designations (2)
71 A1 --- Phot [T] T for Tenagra photometry (table 4)
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Note (2): Notes as follows:
1 = TYC 1991-1673-1 (Hog et al., 2000, Cat. I/259); BD +30 2289.
2 = BPS BS 17141-0020 (Beers et al. 1996, Cat. J/ApJS/103/433).
3 = Period=0.62839d, [Fe/H]=-1.2 (Kinemuchi et al. 2006, Cat. J/AJ/132/1202)
4 = No. 213 (Slettebak & Stock 1959AAHam...5..105S 1959AAHam...5..105S);
A-F 140 (Sanduleak 1988, Cat. J/ApJS/66/309).
5 = BD+37 2346; TYC 2534-1296-1 (Hog et al. 2000, Cat. I/259);
A-F 813 (MacConnell et al., 1993, Cat. J/ApJS/86/453).
Haggkvist & Oja (1973A&AS...12..381H 1973A&AS...12..381H) give V=10.19 B-V=+0.21 U-B=0.10,
appropriate for main-sequence star.
6 = BPS BS 16938-0026 (Beers et al., 1996, Cat. J/ApJS/103/433).
Period=0.68511days, [Fe/H]=-2.2 (Kinemuchi et al. 2006, J/AJ/132/1202).
7 = A-F 930 (MacConnell et al., 1993, Cat. J/ApJS/86/453);
BPS BS 16924-0007 (Beers et al. 1996, Cat. J/ApJS/103/433).
Period=0.58620days (Kinemuchi et al. 2006, Cat. J/AJ/132/1202).
8 = A-F 938 (MacConnell et al., 1993, Cat. J/ApJS/86/453);
BPS BS 16924-0010 (Beers et al., 1996, Cat. J/ApJS/103/433).
9 = TYC 3025-723-1 (Hog et al., 2000, Cat. I/259);
BPS BS 17450-0019 (Beers et al., 1996, Cat. J/ApJS/103/433).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- ROTSE1 Star identification in Akerlof et al.
(2000, Cat. J/AJ/119/1901)
21- 32 F12.4 d HJD Heliocentric Julian Date
34- 39 F6.3 mag Vmag The Johnson V magnitude
41- 46 F6.3 mag B-V The Johnson (B-V) color index
48- 52 F5.3 --- Phase Phase
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- ROTSE1 Star identification in Akerlof et al.
(2000, Cat. J/AJ/119/1901)
21- 32 F12.4 d HJD Heliocentric Julian Date
34- 38 F5.2 mag Vmag ? The Johnson V band magnitude
40- 44 F5.2 mag Bmag ? The Johnson B band magnitude
46- 50 F5.3 --- Phase Phase
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Byte-by-byte Description of file: table56.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- ROTSE1 ROTSE1 designation (JHHMMSS.ss+DDMMSS.s)
21- 23 A3 --- Type RR Lyrae type or Eclipsing system (1)
25- 32 F8.4 d HJD ? Heliocentric Julian Date of
mid-exposure (+2,454,000.0)
34- 36 I3 s Int ? Integration time
38- 42 F5.3 --- Phase ? Phase of mid-exposure
44- 47 I4 km/s HRV ? Heliocentric radial velocity (2)
49- 52 F4.1 0.1nm EWH ? Mean pseudo-equivalent width of
Hγ & Hδ
54- 57 F4.1 0.1nm EWK ? Pseudo equivalent width of CaII K-line
59- 62 F4.1 --- DS ? Non-standard ΔS index
64- 66 F3.1 0.1nm FWHM ? FWHM of MgII λ4481 line
68- 71 F4.2 rad phi31 ?=- Fourier coefficient derived from
hand-drawn light curve
73- 77 F5.2 [-] [m/H]1 ?=- Non-standard metallicity [m/H] derived from
the spectra
78 A1 --- u_[m/H]1 Uncertainty flag on [m/H]1
80- 84 F5.2 [-] [m/H]2 ?=- Non-standard [m/H] derived from the
Fourier coefficient phi31
85 A1 --- u_[m/H]2 Uncertainty flag on [m/H]2
87- 91 F5.2 [-] [m/H]3 ?=- Non-standard [m/H] derived from the
V amplitude.
93- 97 F5.2 [-] [m/H]4 ?=- Non-standard [m/H] derived from the
Rise-time (phase difference between
minimum and following maximum)
99-102 F4.1 [-] [m/H] ?=- Adopted non-standard metallicity [m/H]
103 A1 --- u_[m/H] Uncertainty flag on [m/H]
105-109 F5.2 mag VMAG Absolute magnitude derived as described in
the text
111-114 F4.2 kpc Dist Distance
116-119 I4 km/s V Galactic velocity vector
121-123 I3 km/s e_V rms uncertainty on Galactic velocity vector
124 A1 --- u_V [)] Uncertainty flag on V
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Note (1): Type derived by our photometry: RRab = RR0; RRc = RR1.
EW = Eclipsing system
Note (2): In the case of the RR Lyrae stars this has been corrected to the
γ-velocity following Liu (1991PASP..103..205L 1991PASP..103..205L)
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Global notes:
Note (G1): Type given by Akerlof et al. (2000, Cat. J/AJ/119/1901)
rrab = RR0; rrc = RR1.
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History:
From electronic version of the journal
References:
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 28-May-2012