J/MNRAS/404/1475 JHK photometry of Leo I AGB and red giants (Held+, 2010)
A near-infrared study of AGB and red giant stars in the Leo I dSph galaxy.
Held E.V., Gullieuszik M., Rizzi L., Girardi L., Marigo P., Saviane I.
<Mon. Not. R. Astron. Soc., 404, 1475-1489 (2010)>
=2010MNRAS.404.1475H 2010MNRAS.404.1475H
ADC_Keywords: Galaxies, nearby ; Stars, giant ; Photometry, infrared
Keywords: stars: AGB and post-AGB - stars: carbon -
galaxies: individual: Leo I - Local Group - galaxies: stellar content
Abstract:
A near-infrared imaging study of the evolved stellar populations
in the dwarf spheroidal galaxy Leo I is presented. Based on JHK
observations obtained with the WFCAM wide-field array at the United
Kingdom Infrared Telescope, we build a near-infrared photometric
catalogue of red giant branch (RGB) and asymptotic giant branch (AGB)
stars in Leo I over a 13.5arcmin2 area. The V-K colours of RGB
stars, obtained by combining the new data with existing optical
observations, allow us to derive a distribution of global metallicity
[M/H] with average [M/H]=-1.51 (uncorrected) or
[M/H]=-1.24±.05(int)±0.15(syst) after correction for the mean age
of Leo I stars.
Description:
Observations of Leo I were carried out on 2005 April 19-20 using the
NIR Wide Field Camera (WFCAM) at the UKIRT at Mauna Kea, Hawaii.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 48 7471 The NIR catalogue of Leo I stars over WFCAM
array No. 2
table4.dat 60 39 Candidate O-rich AGB stars in Leo I, as selected
from the NIR two-colour diagram (Fig. 6, region 1)
table5.dat 75 37 *Candidate C-rich AGB stars in Leo I
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Note on table5.dat: All stars were selected from the NIR two-colour diagram
(Fig. 6, region 4), with the exception of stars 7125 and 11242 which are
spectroscopically identified C stars fainter than the TRGB
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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- 6 I6 --- [HGR2010] Sequential number
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 18 F5.2 s RAs [0/60] Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 30 F4.1 arcsec DEs [0/60] Declination (J2000)
32- 36 F5.2 mag Jmag 2MASS J magnitude (1)
38- 42 F5.2 mag Hmag 2MASS H magnitude (1)
44- 48 F5.2 mag Ksmag 2MASS Ks magnitude (1)
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Note (1): Our raw photometric catalogue was transformed to the 2MASS
photometric system by applying the colour terms between WFCAM and
2MASS systems derived for the UKIRT Infrared Deep Sky Survey (UKIDSS;
Dye et al. 2006MNRAS.372.1227D 2006MNRAS.372.1227D), and zero-points directly computed
from the median of the J H K magnitude differences between 2MASS and
our WFCAM photometry in the colour range 0.0<J-K<1. 0, for stars in
common with the 2MASS/PSC.
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Byte-by-byte Description of file: table[45].dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- [HGR2010] Sequential number
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 18 F5.2 s RAs [0/60] Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 30 F4.1 arcsec DEs [0/60] Declination (J2000)
32- 36 F5.2 mag Bmag ?=- Johnson B magnitude
38- 42 F5.2 mag Vmag ?=- Johnson V magnitude
44- 48 F5.2 mag Jmag 2MASS J magnitude
50- 54 F5.2 mag Hmag 2MASS H magnitude
56- 60 F5.2 mag Ksmag 2MASS Ks magnitude
62- 75 A14 --- Note Cross-identifications (only in table5) (1)
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Note (1): Cross-identifications with the surveys of
Azzopardi et al. (1986A&A...161..232A 1986A&A...161..232A, ALW, in Simbad),
Demers & Battinelli (2002AJ....123..238D 2002AJ....123..238D, DB, <[DB2002] Leo I CNN> in Simbad)
and Menzies et al. (2002MNRAS.335..923M 2002MNRAS.335..923M, M02, <[MFT2002] A> in Simbad)
are given. Probable variable stars in M02 are labelled 'v'.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Dec-2010