J/MNRAS/462/4349 Variable stars in Sculptor dSph (Martinez-Vazquez+, 2016)
Variable stars in Local Group Galaxies. II. Sculptor dSph.
Martinez-vazquez C.E., Stetson P.B., Monelli M., Bernard E.J.,
Fiorentino G., Gallart C., Bono G., Cassisi S., Dall'Ora M., Ferraro I.,
Iannicola G., Walker A.R.
<Mon. Not. R. Astron. Soc., 462, 4349-4370 (2016)>
=2016MNRAS.462.4349M 2016MNRAS.462.4349M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Stars, variable ; Photometry, UBVRI
Keywords: stars: variables: general - galaxies: evolution -
galaxies: individual: Sculptor dSph - Local Group -
galaxies: stellar content
Abstract:
We present the identification of 634 variable stars in the Milky Way
dwarf spheroidal (dSph) satellite Sculptor based on archival
ground-based optical observations spanning ∼24yr and covering
∼2.5deg2. We employed the same methodologies as the 'Homogeneous
Photometry' series published by Stetson. In particular, we have
identified and characterized one of the largest (536) RR Lyrae samples
so far in a Milky Way dSph satellite. We have also detected four
Anomalous Cepheids, 23 SX Phoenicis stars, five eclipsing binaries,
three field variable stars, three peculiar variable stars located
above the horizontal branch - near to the locus of BL Herculis - that
we are unable to classify properly. Additionally, we identify 37 long
period variables plus 23 probable variable stars, for which the
current data do not allow us to determine the period. We report
positions and finding charts for all the variable stars, and basic
properties (period, amplitude, mean magnitude) and light curves for
574 of them. We discuss the properties of the RR Lyrae stars in the
Bailey diagram, which supports the coexistence of subpopulations with
different chemical compositions. We estimate the mean mass of
Anomalous Cepheids (∼1.5M☉) and SX Phoenicis stars (∼1M☉).
We discuss in detail the nature of the former. The connections between
the properties of the different families of variable stars are
discussed in the context of the star formation history of the Sculptor
dSph galaxy.
Description:
The photometric data set used for this study consists of 5149
individual CCD images obtained during 21 observing runs between 1987
October and 2011 August (i.e. over nearly 24yr). It covers an area
over the sky of ∼4.7deg2 centred on the Sculptor dSph galaxy.
However, only 4404 images (within ∼2.5deg2) were calibrated
photometrically, while the area with a significant number of epochs
for the variability study is further reduced to ∼2.0deg2. These
data were acquired with a variety of cameras on a number of different
telescopes at the European Southern Observatory, Cerro Tololo
Interamerican Observatory, and Las Campanas Observatory .
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 192 536 Parameters of the RRL stars in Sculptor dSph
table6.dat 107 4 Parameters of the AC stars in Sculptor dSph
table8.dat 105 23 Parameters of the SX Phe in Sculptor dSph
table9.dat 105 3 Parameters of the three peculiar variable stars
in Sculptor dSph
table10.dat 105 5 Parameters of the eclipsing binary stars in
in Sculptor dSph
table11.dat 105 3 Parameters of the field variable star found in
in Sculptor dSph
table12.dat 126 60 Parameters of the candidates variable stars with
problems of classification in Sculptor dSph
table13.dat 101 29 Parameters of non-variable stars in Sculptor dSph
table2.dat 85 51927 Photometry of the variable stars in Sculptor dSph
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See also:
J/A+AS/112/407 : Variable Stars in the Sculptor dwarf galaxy (Kaluzny+, 1995)
J/ApJ/842/60 : Variable stars in Logal Group galaxies. III. (Monelli+, 2017)
Byte-by-byte Description of file: table[4689].dat table1[01].dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Star Star name (scl-CEMVNNN)
12 A1 --- n_Star [a] Note on Star
14- 18 A5 --- Name Original name (G1)
21- 25 A5 --- AName Alternative name (G1)
27- 28 I2 h RAh Right ascension (J2000)
30- 31 I2 min RAm Right ascension (J2000)
33- 37 F5.2 s RAs Right ascension (J2000)
39 A1 --- DE- Declination sign (J2000)
40- 41 I2 deg DEd Declination (J2000)
43- 44 I2 arcmin DEm Declination (J2000)
46- 49 F4.1 arcsec DEs Declination (J2000)
51- 60 F10.8 d Per Period
61- 62 A2 --- u_Per [: ] Uncertainty flag on Per
64- 69 F6.3 mag <Bmag> Mean B magnitude
71- 76 F6.3 mag <Vmag> Mean V magnitude
78- 83 F6.3 mag <Imag> Mean I magnitude
85- 89 F5.3 mag AB Amplitude in B band
91- 95 F5.3 mag AV Amplitude in V band
97-101 F5.3 mag AI Amplitude in I band
103 A1 --- Q1 [0-5] Quality flag for light curve (G2)
105 A1 --- Q2 [0-1] Quality flag for light curve
coverage (G3)
107-110 A4 --- Type Variable type
112-192 A81 --- Note Notes
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Byte-by-byte Description of file: table12.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Star Star name (scl-CEMVNNN)
14- 18 A5 --- Name Original name (G1)
21- 25 A5 --- AName Alternative name (G1)
27- 28 I2 h RAh Right ascension (J2000)
30- 31 I2 min RAm Right ascension (J2000)
33- 37 F5.2 s RAs Right ascension (J2000)
39 A1 --- DE- Declination sign (J2000)
40- 41 I2 deg DEd Declination (J2000)
43- 44 I2 arcmin DEm Declination (J2000)
46- 49 F4.1 arcsec DEs Declination (J2000)
51-126 A76 --- Note Notes
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Byte-by-byte Description of file: table13.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Name Original name (G1)
7- 11 A5 --- AName Alternative name (G1)
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 23 F5.2 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 35 F4.1 arcsec DEs Declination (J2000)
37-112 A76 --- Note Notes
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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- 11 A11 --- Star Star name (scl-CEMVNNN)
13- 22 F10.4 d MHJDB ? Modified Julian date for B band (1)
24- 29 F6.3 mag Bmag ? B magnitude
31- 35 F5.3 mag e_Bmag ? rms uncertainty on Bmag
38- 47 F10.4 d MHJDV ? Modified Julian date for V band (1)
49- 54 F6.3 mag Vmag ? V magnitude
56- 60 F5.3 mag e_Vmag ? rms uncertainty on Vmag
63- 72 F10.4 d MHJDI ? Modified Julian date for I band (1)
74- 79 F6.3 mag Imag ? I magnitude
81- 85 F5.3 mag e_Imag ? rms uncertainty on Imag
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Note (1): Modified Heliocentric Julian Date of mid-exposure: HJD-2400000.
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Global notes:
Note (G1): VNNN from van Agt (1978PDDO....3..205V 1978PDDO....3..205V), [V78] NNN in Simbad,
KNNN form Kaluzny et al. (1995, Cat. J/A+AS/112/407), OGLE Scl NNNN in Simbad.
Note (G2): Flag associated with quality of the light curve as follows:
0 = good
1 = poor quality
2 = noisy
3 = outliers
4 = blended
5 = Blazhko effect
Note (G3): Flag related with the coverage of the light curve as follows:
0 = not well sampled and/or too noisy
1 = well sampled and not too noisy
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History:
From electronic version of the journal
References:
Martinez-Vazquez et al., Paper I 2015MNRAS.454.1509M 2015MNRAS.454.1509M
Monelli et al., Paper III 2017ApJ...842...60M 2017ApJ...842...60M, Cat. J/ApJ/842/60
(End) Patricia Vannier [CDS] 25-Apr-2018