J/MNRAS/354/708 Leo I VI photometry (Bellazzini+, 2004)
The distance to the Leo I dwarf spheroidal galaxy from the red giant branch tip.
Bellazzini M., Gennari N., Ferraro F.R., Sollima A.
<Mon. Not. R. Astron. Soc., 354, 708-712 (2004)>
=2004MNRAS.354..708B 2004MNRAS.354..708B
ADC_Keywords: Galaxies, photometry ; Photometry, UBVRI
Keywords: stars: Population II - galaxies: distances and redshifts - Local Group
Abstract:
We present V and I photometry of a 9.4'x9.4' field centered on the
dwarf spheroidal galaxy Leo I. The I magnitude of the tip of the Red
Giant Branch is robustly estimated from two different datasets
ITRGB=17.97 (+0.05-0.03). From this estimate, adopting
[M/H]~-1.2 from the comparison of RGB stars with Galactic templates,
we obtain a distance modulus (m-M)_0=22.02±0.13, corresponding to a
distance D=254+16-19kpc.
Description:
The data were obtained at the 3.52-m Italian telescope TNG (Telescopio
Nazionale Galileo - Roque de los Muchachos, La Palma, Canary Islands,
Spain). The observations were carried out over three nights (2001
March 19-21). The photometric system used is Johnson-Kron-Cousins
(Landolt's photometric standards).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 85 12626 Stars positions and magnitudes
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Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Identification number
8- 13 F6.3 mag Vmag Johnson V magnitude
16- 20 F5.3 mag e_Vmag Uncertainty on V magnitude (DoPHOT)
23- 28 F6.3 mag Icmag Cousins I magnitude
31- 35 F5.3 mag e_Icmag Uncertainty on I magnitude (DoPHOT)
37- 43 F7.2 pix xpos x position in the frame
45- 51 F7.2 pix ypos y position in the frame
53- 54 I2 h RAh Right ascension (J2000.0)
56- 57 I2 min RAm Right ascension (J2000.0)
59- 64 F6.3 s RAs Right ascension (J2000.0)
66 A1 --- DE- Declination sign (J2000.0)
67- 68 I2 deg DEd Declination (J2000.0)
70- 71 I2 arcmin DEm Declination (J2000.0)
73- 78 F6.3 arcsec DEs Declination (J2000.0)
81- 88 A8 ----- Var Carbon star name (1)
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Note (1):
-- CNN stands for [DB2002] Leo I CNN (Demers at al., 2002AJ....123..238D 2002AJ....123..238D)
-- ALWNN for ALW Leo II N (Azzopardi et al., 1985A&A...144..388A 1985A&A...144..388A)
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Acknowledgements: Michele Bellazzini, michele.bellazzini(at)bo.astro.it
(End) Patricia Vannier [CDS] 20-Apr-2005