J/MNRAS/378/318 Chemical abundances in Leo I and II dSph (Bosler+, 2007)
The chemical abundances of the stellar populations in the Leo I and II dSph
galaxies.
Bosler T.L., Smecker-Hane T.A., Stetson P.B.
<Mon. Not. R. Astron. Soc., 378, 318-338 (2007)>
=2007MNRAS.378..318B 2007MNRAS.378..318B
ADC_Keywords: Galaxies, nearby ; Abundances ; Equivalent widths
Keywords: stars: abundances - galaxies: abundances - galaxies: dwarf -
galaxies: evolution - galaxies: individual: Leo I dSph, Leo II dSph
Abstract:
We have obtained calcium abundances and radial velocities for 102 red
giant branch (RGB) stars in the Leo I dwarf spheroidal galaxy (dSph)
and 74 RGB stars in the Leo II dSph using the low-resolution
spectrograph (LRIS) on the Keck I 10-m telescope. We report on the
calcium abundances [Ca/H] derived from the strengths of the Ca ii
triplet absorption lines at 8498, 8542 and 8662Å in the stellar
spectra using a new empirical Ca II triplet calibration to [Ca/H].
Description:
The photometry and astrometry for Leo I and II were obtained as part
of a larger program to provide homogeneous photometry for star
clusters and nearby resolved galaxies (e.g. Stetson, Hesser &
Smecker-Hane 1998, Cat. J/PASP/110/533; Stetson
2000PASP..112..925S 2000PASP..112..925S). The present photometry is based upon a large
database of CCD images acquired by ourselves and collaborators, images
obtained from the archives of the Canada-France-Hawaii Telescope and
the Isaac Newton Group and images privately donated by other
astronomers.
Objects:
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RA (2000) DE Designation(s)
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10 08 28 +12 18.4 Leo I dSph = UGC 5470
11 13 28 +22 09.2 Leo II dSph = UGC 6253
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 49 101 Parameters for stars in the Leo I dSph
table7.dat 49 74 Parameters for stars in the Leo II dSph
table8.dat 47 101 Spectroscopic data for stars in the Leo I dSph
table9.dat 47 74 Spectroscopic data for stars in the Leo II dSph
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See also:
J/A+AS/121/95 : Atmospheric parameters for 24 clusters (Carreta+ 1997)
J/PASP/109/883 : Globular metallicity scale. I. (Rutledge+ 1997)
J/PASP/110/533 : BR photometry of Fornax bright stars (Stetson+ 1998)
Byte-by-byte Description of file: table6.dat table7.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- [BSS2007b] Sequential number (G1)
7- 11 F5.2 mag Vmag Johnson V magnitude
13- 16 F4.2 mag B-V Johnson B-V colour index
18- 19 I2 h RAh Right ascension (J2000)
21- 22 I2 min RAm Right ascension (J2000)
24- 28 F5.2 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 40 F4.1 arcsec DEs Declination (J2000)
42- 43 I2 --- S/N Signal-to-noise ratio
45- 49 F5.1 km/s HRV Heliocentric radial velocity
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Byte-by-byte Description of file: table8.dat table9.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- [BSS2007b] Sequential number (G1)
7- 10 F4.2 0.1nm W' Reduced equivalent width (1)
12- 15 F4.2 0.1nm e_W' rms uncertainty on W'
17- 21 F5.2 [Sun] [Fe/H] Metallicity from Carreta & Gratton
(1997, Cat. J/A+AS/121/95)
23- 26 F4.2 [Sun] e_[Fe/H] Total error on [Fe/H]
28- 31 F4.2 [Sun] e[Fe/H] Random error on [Fe/H]
33- 37 F5.2 [Sun] [Ca/H] Ca abundance
39- 42 F4.2 [Sun] e_[Ca/H] Total error on [Ca/H]
44- 47 F4.2 [Sun] e[Ca/H] Random error on [Ca/H]
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Note (1): W'=[{Sum}W]+0.64(V-VHB), where V and VHB are the V-band
magnitudes of the observed stars and the cluster or dSph horizontal
branch, respectively. The W' values listed here have been scaled to
the work of Rutledge et al., (1997, Cat. J/PASP/109/883).
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Global notes:
Note (G1): Objects identified in Simbad as
[BSS2007b] Leo I NNNNN for tables 6 and 8
[BSS2007b] Leo II NNN for tables 7 and 9
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Dec-2007