J/AJ/142/107 Variable stars in NGC 1466 (Kuehn+, 2011)
Variable stars in Large Magellanic Cloud globular clusters. I. NGC 1466.
Kuehn C.A., Smith H.A., Catelan M., Pritzl B.J., De Lee N., Borissova J.
<Astron. J., 142, 107 (2011)>
=2011AJ....142..107K 2011AJ....142..107K
ADC_Keywords: Magellanic Clouds ; Clusters, globular ; Stars, variable ;
Photometry, UBV
Keywords: Magellanic Clouds - stars: horizontal-branch -
stars: variables: general - stars: variables: RR Lyrae
Abstract:
This is the first in a series of papers studying the variable stars in
Large Magellanic Cloud globular clusters. The primary goal of this
series is to better understand how the RR Lyrae stars in
Oosterhoff-intermediate systems compare to those in Oosterhoff I/II
systems. In this paper, we present the results of our new time-series
BV photometric study of NGC 1466. A total of 62 variables were
identified in the cluster, of which 16 are new discoveries. The
variables include 30 RRab stars, 11 RRc stars, 8 RRd stars, 1
candidate RR Lyrae, 2 long-period variables, 1 potential anomalous
Cepheid, and 9 variables of undetermined classification. We present
photometric parameters for these variables.
Description:
A total of 40 V and 37 B images of NGC 1466 were obtained with the
Southern Astrophysical Research (SOAR) telescope using the SOAR
Optical Imager (SOI) in 2008 February and December. An additional 45 V
and 43 B images were obtained using ANDICAM on the SMARTS 1.3m
telescope operated by the SMARTS consortium6 from 2006 September to
2007 January.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 97 54 Photometric parameters for variables in NGC 1466,
excluding RRd stars
table3.dat 110 8 Photometric parameters for the RRd variables in
NGC 1466
table2.dat 61 8160 Photometry of the variable stars
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- VName Variable name (V01 to V68)
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 14 F4.1 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 26 F4.1 arcsec DEs Declination (J2000)
28- 36 A9 --- Type Variable type (1)
38- 44 F7.5 d Per ? Period
46- 49 F4.2 mag Vamp ? Amplitude in V band
51- 54 F4.2 mag Bamp ? Amplitude in B band
56- 61 F6.3 mag <Vmag> ? Intensity-weighted V mean magnitude
63- 68 F6.3 mag <Bmag> ? Intensity-weighted B mean magnitude
70- 74 F5.3 mag <B-V> ? Magnitude-weighted B-V mean colour index
76- 84 A9 --- OName Other name(s) (G1)
86- 97 F12.4 d TMax ? Time of maximum light (HJD)
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Note (1): The RRab stars that potentially exhibit the Blazhko effect are
indicated as "RRab-BL," see Section 3.1 for further discussion on the
detection of the Blazhko effect in the RRab stars in NGC 1466.
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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- 3 A3 --- VName Variable name (V01 to V68)
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 14 F4.1 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 26 F4.1 arcsec DEs Declination (J2000)
28- 30 A3 --- Type [RRd] Variable type
32- 37 F6.4 d P0 Fundamental mode period
39- 44 F6.4 d P1 First overtone period
46- 51 F6.4 d P1/P0 Period ratio, P1/P0
53- 56 F4.2 mag Vamp0 Fundamental mode amplitude in V band
58- 61 F4.2 mag Vamp1 First overtone amplitude in V band
63- 66 F4.2 mag Bamp0 Fundamental mode amplitude in B band
68- 71 F4.2 mag Bamp1 First overtone amplitude in B band
73- 78 F6.3 mag <Vmag> Intensity-weighted V mean magnitude
80- 85 F6.3 mag <Bmag> Intensity-weighted B mean magnitude
87- 91 F5.3 mag <B-V> Magnitude-weighted B-V mean colour index
93- 97 A5 --- OName Other name(s) (G1)
99-110 F12.4 d TMax Time of maximum light (HJD)
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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- 3 A3 --- VName Variable name (V01 to V68)
5 A1 --- Filter [BV] Filter
7- 20 F14.6 d HJD Heliocentric Julian Date
22- 26 F5.3 --- Phase ?=- Phase (1)
28- 33 F6.3 mag mag ? Magnitude in Filter (2)
35- 40 F6.4 mag e_mag ? Error in mag
41- 51 F11.3 --- dflux ? Differential flux in Filter (2)
53- 61 F9.4 --- e_dflux ? Error in dflux
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Note (1): Computed such that maximum light occurs at phase 0.
Note (2): Differential fluxes for V31, V51, V54, V60 and V67,
magnitudes for the other variables.
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Global notes:
Note (G1): Other names from Walker, 1992AJ....104.1395W 1992AJ....104.1395W.
In Simbad, WaNNN = Cl* NGC 1466 WALK NNNN and SNN = Cl* NGC 1466 S NN
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History:
From electronic version of the journal
References:
Kuehn et al., Paper II, 2012AJ....144..186K 2012AJ....144..186K, Cat. J/AJ/144/186
Kuehn et al., Paper III, 2013AJ....145..160K 2013AJ....145..160K, Cat. J/AJ/145/160
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 20-Nov-2012