J/A+A/423/133 Spectral indexes in HII galaxies (Westera+, 2004)
Stellar populations in HII galaxies.
Westera P., Cuisinier F., Telles E., Kehrig C.
<Astron. Astrophys., 423, 133-146 (2004)>
=2004A&A...423..133W 2004A&A...423..133W
ADC_Keywords: Galaxies, spectra ; H II regions
Keywords: catalogs - stars: atmospheres - HII regions - galaxies: evolution -
galaxies: starburst - galaxies: stellar content
Abstract:
We analyse the stellar content of a large number of HII galaxies from
the continua and absorption features of their spectra using population
synthesis methods, in order to gain information about the star
formation histories of these objects.
We find that all galaxies of our sample contain an old stellar
population (≥1Gyr) that dominates the stellar mass, and in a majority
of these we also found evidence for an intermediate-age population
≥50Myr apart from the presently bursting, ionizing young generation
≤107yr.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
position.dat 55 113 *Galaxy positions (from Simbad or NED)
tablea1.dat 78 201 Indices of individual spectra
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Note on position.dat: data not present in the published table, were added
at CDS from a comparison of the names with Simbad or NED data-bases.
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Byte-by-byte Description of file: position.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Galaxy Galaxy name
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 25 F4.1 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 35 I2 arcsec DEs Declination (J2000)
37- 55 A19 --- SName Simbad name
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Galaxy Galaxy name
15- 31 A17 --- Spectra Name of the spectra, when more than one
by galaxy (1)
35- 36 A2 --- Type [re in] Type of spectra (2)
38- 43 F6.3 --- Cont Continuum index
45- 50 F6.3 --- D(4000) 4000Å break spectral index
52- 57 F6.3 --- H+K(Ca) H+K(Ca) spectral index
59- 64 F6.3 --- Hdelta Hδ spectral index
66- 71 F6.3 --- Fe4531 Fe4531 spectral index
73- 78 F6.3 mag Mgb Mgb spectral index (5162-5193Å)
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Note (1): In those cases where the apertures were centered on a secondary
knot, an indication between brackets about the position of the
aperture, where "Cent'' stands for the centre of the galaxy, and the
abbreviations "N'', "E'', "S'', and "W'' (and "NE'' etc.) indicate
that the aperture was positioned at knots at the North, East, South or
West of the galaxy.
Note (2): Type of spectrum as:
in: integrated spectra
re: spectra of individual regions
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Aug-2005