J/MNRAS/406/329 Variable stars in M54 (Sollima+, 2010)
The population of variable stars in M54 (NGC6715).
Sollima A., Cacciari C., Bellazzini M., Colucci S.
<Mon. Not. R. Astron. Soc., 406, 329-341 (2010)>
=2010MNRAS.406..329S 2010MNRAS.406..329S
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, UBVRI ;
Photometry, CCD
Keywords: methods: observational - techniques: photometric - stars: distances -
stars: variables: RR Lyrae - globular clusters: individual: M54
Abstract:
We present new B, V and I CCD time-series photometry for 177 variable
stars in a 13x13arcmin2 field centred on the globular cluster M54
using the European Southern Observatory (ESO)-Danish 1.54-m telescope
in La Silla, 94 of which are newly identified variables. The total
sample is composed of two anomalous Cepheids, 144 RR Lyrae stars (108
RR0 and 36 RR1), three SX Phoenicis, seven eclipsing binaries (five W
UMa and two Algol binaries), three variables of uncertain
classification and 18 long-period variables. Ephemerides are provided
for all the observed short-period variables. The positional accuracy
is better than 0.2".
Description:
The BVI photometric data presented in this paper were obtained on 1999
July 13, 14 and 19 at the European Southern Observatory (ESO)-Danish
1.54-m telescope in La Silla (Chile) using the 2kx2k CCD of the
Danish Faint Object Spectrograph and Camera.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 131 177 M54 variables catalog
lcurves.dat 33 14232 BVI epoch photometry for RR Lyrae and other
variables in M54
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See also:
J/AJ/109/1086 : VI Photometry in M54 and Sgr Dwarf Galaxy (Sarajedini+ 1995)
J/AJ/118/1245 : Elemental abundances in five stars in M54 (Brown+, 1999)
J/AJ/119/1760 : M54 and Sgr dSph VI photometry (Layden+, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- Seq [1/211] Variable identification number (1)
6 A1 --- C [C] C indicates available light curve(s)
8 I1 --- Var [0/7] Variable type (2)
10- 19 F10.6 deg RAdeg Right ascension J2000 (degrees)
21- 30 F10.6 deg DEdeg Declination J2000 (degrees)
33- 41 F9.7 d Per ? Period
43- 53 F11.5 d T0 ? Epoch of maximum light (HJD-2400000)
55- 59 F5.2 mag <Bmag> ? Mean Bessell B magnitude
61- 65 F5.2 mag <Vmag> ? Mean Bessell V magnitude
67- 71 F5.2 mag <Imag> ? Mean Bessell I magnitude
74- 77 F4.2 mag e_<Vmag> ? Mean V magnitude error
80- 83 F4.2 mag Bamp ? B pulsation amplitude
86- 89 F4.2 mag Vamp ? V pulsation amplitude
92- 95 F4.2 mag Iamp ? I pulsation amplitude
98-102 F5.3 mag (B-V)m ? B-V color index at minimum light
105-109 F5.3 mag (V-I)m ? V-I color index at minimum light
112-116 F5.3 mag <B-V> ? Mean B-V color index
119-123 F5.3 mag <V-I> ? Mean V-I color index
125-131 A7 --- Note Note (3)
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Note (1): ID are from Clement et al (2001AJ....122.2587C 2001AJ....122.2587C; V1-V82), Layden
and Sarajedini (2000, Cat. J/AJ/119/1760; V83-V117) and this paper
(V118-V211). Cl* NGC 6715 Saw VNNN in Simbad.
Note (2): Variable types as follows:
0 = Cepheid
1 = RR0 (RR Lyr fundamental mode)
2 = RR1 (RR Lyr first overtone)
3 = SX Phe
4 = LP (Long Period)
5 = EW (Eclipsing Binary, W Uma type)
6 = EA (Eclipsing Binary, Algol type)
7 = Uncertain
Note (3): Notes as follows:
Bl = possible Blazhko variability
b = possible blend
Cal = calibration problem
F = possible Galactic field member
Sgr = possible Sgr member
Ev = possible evolved
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Byte-by-byte Description of file: lcurves.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Variable identification number
5- 17 F13.5 d HJD Heliocentric Julian Date
19 A1 --- Band [BVI] Observed band
21- 26 F6.3 mag mag B, V or I magnitude
29- 33 F5.3 mag e_mag Mean error on mag
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Acknowledgements:
* 15-Jul-2010: Antonio Sollima, asollima(at)iac.es
* 13-Nov-2010: corrected version of the table, from author (Antonio Sollima)
(coordinate list was shifted from row#148)
(End) Antonio Sollima [IAC, Spain], Patricia Vannier [CDS] 13-Nov-2010