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J/MNRAS/360/185     VI photometry of the Leo II galaxy       (Bellazzini+, 2005)

The red giant branch tip and bump of the Leo II dwarf spheroidal galaxy. Bellazzini M., Gennari N., Ferraro F.R. <Mon. Not. R. Astron. Soc., 360, 185-193 (2005)> =2005MNRAS.360..185B
ADC_Keywords: Galaxies, photometry ; Photometry, CCD ; Photometry, UBVRI Keywords: stars: Population II - galaxies: distances and redshifts - Local Group - variable stars: RR Lyrae Abstract: We present V and I photometry of a 9.4'x9.4' field centered on the dwarf spheroidal galaxy Leo II. The Tip of the Red Giant Branch is identified at ITRGB=17.83±0.03 and adopting <[M/H]≥-1.53±0.2 from the comparison of RGB stars with Galactic templates, we obtain a distance modulus (m-M)_0=21.84±0.13, corresponding to a distance D=233±15kpc. Two significant bumps have been detected in the Luminosity Function of the Red Giant Branch. The fainter bump (B1, at V=21.79±0.05) is the RGB bump of the dominant stellar population while the brightest one (B2, at V=21.36±0.05) may be identified as the Asymptotic Giant Branch Clump of the same population. The luminosity of the main RGB bump (B1) suggest that the majority of RGB stars in Leo II belongs to a population that is ≳4Gyr younger than the classical Galactic globular clusters. The stars belonging to the He-burning Red Clump are shown to be significantly more centrally concentrated than RR Lyrae and Blue Horizontal Branch stars, probing the existence of an age/metallicity radial gradient in this remote dwarf spheroidal. Description: V and I photometry and astrometry for 2715 stars in a 9.4'x9.4' field centered on the Leo II dwarf spheroidal galaxy. Photometric system: Johnson-Kron-Cousins (Landolt's photometric standards). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 77 2716 Leo II stars positions and magnitudes
See also: J/MNRAS/354/708 : Leo I VI photometry (Bellazzini+, 2004) J/AJ/120/284 : Variables in Leo II dwarf spheroidal (Siegel+, 2000) J/MNRAS/261/657 : Deep CCD photometry of Leo II (Demers+ 1993) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Identification number 6- 11 F6.3 mag Vmag Johnson V magnitude 13- 17 F5.3 mag e_Vmag Uncertainty on V magnitude (DoPHOT) 19- 24 F6.3 mag Icmag Cousins I magnitude 26- 30 F5.3 mag e_Icmag Uncertainty on Ic magnitude (DoPHOT) 32- 38 F7.2 pix xpos x position in the frame 40- 46 F7.2 pix ypos y position in the frame 48- 49 I2 h RAh Right ascension (J2000.0) 51- 52 I2 min RAm Right ascension (J2000.0) 54- 59 F6.3 s RAs Right ascension (J2000.0) 61 A1 --- DE- Declination sign (J2000.0) 62- 63 I2 deg DEd Declination (J2000.0) 65- 66 I2 arcmin DEm Declination (J2000.0) 68- 72 F5.2 arcsec DEs Declination (J2000.0) 74- 77 A4 ----- [SM2000] Variable star name according to Siegel & Majewski, 2000, Cat. J/AJ/120/284 (except V173, this paper)
Acknowledgements: Michele Bellazzini, michele.bellazzini(at)bo.astro.it
(End) Michele Bellazzini [INAF-OAB, Italy], Patricia Vannier [CDS] 27-Jun-2005
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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