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J/AJ/120/284        Variables in Leo II dwarf spheroidal     (Siegel+, 2000)

Exploring the Leo II dwarf spheroidal galaxy. I. The variable star content. Siegel M.H., Majewski S.R. <Astron. J. 120, 284 (2000)> =2000AJ....120..284S
ADC_Keywords: Stars, variable ; Photometry ; Regional catalog Keywords: galaxies: dwarf - galaxies: individual (Leo II) - galaxies: stellar content - stars: variables: general Abstract: We present the first comprehensive catalog of variable stars in the Leo II dwarf spheroidal galaxy. We have identified 148 RR Lyrae type variables, of which 140 were amenable to derivation of variability parameters with our data. We have also confirmed the existence of four anomalous Cepheids as identified in previous studies. The average period of the RR Lyrae ab variables (0.62 days), the fraction of c variables (0.24), and the minimum period of the RR Lyrae ab variables (0.51 days) all define Leo II as an "Oosterhoff intermediate" galaxy. We have used the properties of these variables to derive a metallicity for Leo II of approximately [Fe/H]=-1.9. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 83 148 RR Lyrae variables table2.dat 88 4 Anomalous Cepheids table4.dat 42 7830 Julian dates and magnitudes table5.dat 13 20 Dickens & Irwin (1993, Cat. J/MNRAS/261/657) stars that are nonvariable
See also: J/MNRAS/261/657 : Deep CCD photometry of Leo II (Demers+ 1993) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- VName Variable designation (VNNN), [SM2000] VNNN in Simbad 6- 9 I4 --- [SM2000] Star identification number, [SM2000] NNNN in Simbad 11- 18 F8.3 pix Xpos X position 20- 27 F8.3 pix Ypos Y position 29- 30 I2 h RAh Right ascension (J2000.0) 32- 33 I2 min RAm Right ascension (J2000.0) 35- 39 F5.2 s RAs Right ascension (J2000.0) 41 A1 --- DE- Declination sign (J2000.0) 42- 43 I2 deg DEd Declination (J2000.0) 45- 46 I2 arcmin DEm Declination (J2000.0) 48- 51 F4.1 arcsec DEs Declination (J2000.0) 53- 59 F7.5 d Per ? Period 61- 65 F5.3 mag AVmag ? Amplitude in the V passband 67- 71 F5.2 mag Vmag V magnitude 73- 76 A4 --- Type Bailey (1902AnHar..38....1B) type (ab, abb, c or Unk.) 78- 83 F6.3 --- dlogPer ? Pediod shift, DeltalogP (1)
Note (1): Period shift is measured by comparison with a reference variable population. The usual candidate population is that of M3, for which Sandage (1982ApJ...252..553S, 1982ApJ...252..574S) derived a measure of ΔlogP=-(0.129AB+ 0.088 + log P), where AB is the amplitude in the B passband. The resulting revised period shift relations are ΔlogP=-(0.129AB + 0.112 + logP), ΔlogP=-(0.156AV + 0.112 + logP).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- VName Variable designation (VNNN) 6- 9 I4 --- [SM2000] Star identification number 11- 18 F8.3 pix Xpos X position 20- 27 F8.3 pix Ypos Y position 29- 30 I2 h RAh Right ascension (J2000.0) 32- 33 I2 min RAm Right ascension (J2000.0) 35- 39 F5.2 s RAs Right ascension (J2000.0) 41 A1 --- DE- Declination sign (J2000.0) 42- 43 I2 deg DEd Declination (J2000.0) 45- 46 I2 arcmin DEm Declination (J2000.0) 48- 51 F4.1 arcsec DEs Declination (J2000.0) 53- 59 F7.5 d Per ? Period 61- 65 F5.3 mag AVmag ? Amplitude in the V passband 67- 71 F5.2 mag Vmag V magnitude 73- 83 A11 --- Mode Pulsation mode 85- 88 A4 --- Swope Swope (1968, AJ, 73, S204) variable number
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [SM2000] Star identification number 8- 19 F12.4 d JD Julian Date 23- 30 F8.5 mag Vmag V band magnitude 34- 40 F7.5 mag e_Vmag Uncertainty in Vmag
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 A4 --- [DI93] DI93 designation (VNNN), in J/MNRAS/261/657, [DI93] NNNN in Simbad 6- 9 I4 --- [SM2000] Star identification number 11- 13 F3.1 --- W-S Welch-Stetson (1993AJ....105.1813W) variability index
History: From AJ electronic version
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 29-Aug-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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