J/A+A/464/201 RGB stars in Sagittarius streams (Monaco+, 2007)
High-resolution spectroscopy of RGB stars in the Sagittarius streams.
I. Radial velocities and chemical abundances.
Monaco L., Bellazzini M., Bonifacio P., Buzzoni A., Ferraro F.R.,
Marconi G., Sbordone L., Zaggia S.
<Astron. Astrophys., 464, 201-209 (2007)>
=2007A&A...464..201M 2007A&A...464..201M
ADC_Keywords: Galaxies, nearby ; Stars, giant ; Radial velocities ; Abundances
Keywords: stars: abundances - stars: atmospheres - galaxies: abundances -
galaxies: evolution - galaxies: dwarf - galaxies: individual: Sgr dSph
Abstract:
The Sagittarius (Sgr) dwarf spheroidal galaxy is currently being
disrupted under the strain of the Milky Way. A reliable reconstruction
of Sgr star formation history can only be obtained by combining core
and stream information.
We present radial velocities for 67 stars belonging to the Sgr Stream.
For 12 stars in the sample we also present iron (Fe) and
α-element (Mg, Ca) abundances.
Description:
Spectra were secured using different high resolution facilities:
UVES@VLT, HARPS@3.6m, and Radial velocities are obtained
through cross correlation with a template spectra. Concerning chemical
analysis, for the various elements, selected line equivalent widths
were measured and abundances computed using the WIDTH code and ATLAS
model atmospheres.
A total of 13 stars were observed between August 30, 2004, and January
24, 2005, using the SARG spectrograph mounted on the Telescopio
Nazionale Galileo (TNG) telescope at La Palma.
We present iron (Fe) and alpha-element (Mg, Ca) abundances for 12 red
giant branch stars belonging to the Sagittarius dwarf spheroidal
galaxy tidal streams.
Spectra were obtained with the SARG spectrograph mounted at the
Telescopio Nazionale Galileo (La Palma, Spain).
We used the 1.6" slit, which provides a resolution of R=29000.
For each star we report the equivalent widths (EWs) measured for a
selected sample of Fe, Mg, and Ca lines along with the abundances
derived for each line from the measured EWs and the adopted atomic
parameters.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 123 67 Basic parameters of the program stars
appendix.dat 54 612 Line by line elemental abundances for 12 stars
--------------------------------------------------------------------------------
See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Sample Sample designation (SARG, HARPS or UVES)
7- 11 A5 --- --- [2MASS]
13- 29 A17 --- 2MASS 2MASS designation (JHHMMSSss+DDMMSSs)
31- 36 I6 --- Star Star sequential number
38- 39 I2 h RAh Right ascension (J2000)
41- 42 I2 min RAm Right ascension (J2000)
44- 47 F4.1 s RAs Right ascension (J2000)
49 A1 --- DE- Declination sign (J2000)
50- 51 I2 deg DEd Declination (J2000)
53- 54 I2 arcmin DEm Declination (J2000)
56- 57 I2 arcsec DEs Declination (J2000)
59- 63 F5.1 deg GLON Galactic longitude
65- 69 F5.1 deg GLAT Galactic latitude
71- 76 F6.2 deg Lambda Longitude along the Sgr orbital plane
78- 82 F5.2 mag K0 Dereddened K magnitude
84- 87 F4.2 mag (J-K)0 Dereddened J-K colour index
89- 92 F4.2 mag E(B-V) Reddening
94- 98 F5.2 kpc Dist Heliocentric distance
100-101 I2 --- S/N Signal-to-noise ratio
103-109 F7.2 km/s HRV Heliocentric velocity
111-115 F5.3 km/s e_HRV rms uncertainty on HRV
117-123 F7.2 km/s Vgsr Galactic standard of rest velocity
--------------------------------------------------------------------------------
Byte-by-byte Description of file: appendix.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- Star Star sequential number
8- 11 A4 --- Ion Element with ionization degree
15- 22 F8.4 nm Lambda Wavelength of the line
27- 31 F5.2 --- loggf Oscillator strength of the line
37- 40 A4 --- r_loggf Reference for log gf (1)
42- 46 F5.2 pm EW ?=- Line equivalent width
50- 54 F5.3 --- eps ?=- Abundance (eps=log(X/H)+12) from this line
--------------------------------------------------------------------------------
Note (1): References as follows:
FMW = Fuhr et al. 1988; J. Phys. Chem. Ref. Data, 17, Suppl. 4 (Cat. VI/72)
NIST = Fuhr & Wiese 1996; NIST Atomic Transition Probability Tables,
CRC Handbook of Chemistry & Physics, 77th edition, ed. D. R. Lide,
CRC Press, Inc., Boca Raton, FL NIST
G03 = Gratton et al. 2003, Cat. J/A+A/404/187
SR = Smith et al. 1981; J. Phys. B At. Mol. Phys., 14, 4015
NBS = Wiese et al. 1969; NSRDS-NBS 22
MFW = Martin et al. 1988; J. Phys. Chem. Ref. Data, 17, Suppl. 3
(Cat. VI/72)
O = O'Brian et al. 1991; Opt. Soc. Am. J. B Opt. Phys., 8, 1185
K88 = Kurucz 1988; Trans. IAU, XXB, ed. M. McNally Dordrecht: Kluwer, 168
K94 = Kurucz 1994; Atomic Data for Fe and Ni. Kurucz CD-ROM No. 22.
Cambridge, Mass.: Smithsonian Astrophysical Observatory, 22
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Apr-2007