J/A+A/479/131 Near-IR spectra of inner red giants (Gonzalez-Fernandez+, 2008)
Metallicity distribution of red giants in the Inner Galaxy from near infrared
spectra.
Gonzalez-Fernandez C., Cabrera-Lavers A., Hammersley P.L., Garzon F.
<Astron. Astrophys. 479, 131 (2008)>
=2008A&A...479..131G 2008A&A...479..131G
ADC_Keywords: Stars, late-type ; Equivalent widths ; Abundances, [Fe/H] ;
Spectra, infrared
Keywords: Galaxy: abundances - Galaxy: general - Galaxy: stellar content -
Galaxy: structure - stars: late-type
Abstract:
The existence in the Milky Way of either a long thin bar with a half
length of 4.5kpc and a position angle of around 45° with respect
to the Sun-Galactic centre line or a bulge+bar complex, thicker and
shorter, with a smaller tilt respect to the Sun-GC line, has been a
matter of discussion in recent decades.
In this paper, we present low resolution (R=500) near-infrared spectra
for selected and serendipitous sources in six inner in-plane Galactic
fields at l=7°, 12°, 15°, 20°, 26° and 27°,
with the aim of analysing the stellar content present in those fields.
Description:
From the equivalent widths of the main features of the K band spectra
(the NaI, CaI and CO bandheads) we have derived the metallicities of
the sources by means of the empirical scale obtained by Ramirez et al.
(2000AJ....120..833R 2000AJ....120..833R) and Frogel et al. (2001AJ....122.1896F 2001AJ....122.1896F) for
luminous red giants.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 75 112 List of target stars
fig/* . 112 Individual images
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Star identification, tnNNN
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 16 F4.1 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 28 F4.1 arcsec DEs Declination (J2000)
30- 31 I2 deg GLON Field Galactic longitude
33- 34 I2 deg GLAT Field Galactic latitude
36- 39 F4.1 mag Kmag K magnitude
41- 43 F3.1 mag J-K J-K colour index
45- 48 F4.1 0.1nm EW(Na) ?=- Na equivalent width
50- 53 F4.1 0.1nm EW(Ca) Ca equivalent width
55- 58 F4.1 0.1nm EW(CO) CO equivalent width
60- 64 F5.2 [Sun] [Fe/H] ?=- Metallicity
66- 75 A10 --- FileName Name of the fits image in subdirectory fig
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Acknowledgements:
Carlos Gonzalez-Fernandez, cgonzal(at)iac.es
(End) Patricia Vannier [CDS] 07-Feb-2008