J/A+A/436/687 SMC NGC 346-11 and AV 304 spectra (Hunter+, 2005)
A non-LTE analysis of the spectra of two narrow lined main sequence stars
in the SMC.
Hunter I., Dufton P.L., Ryans R.S.I., Lennon D.J., Rolleston W.R.J.,
Hubeny I., Lanz T.
<Astron. Astrophys., 436, 687-695 (2005)>
=2005A&A...436..687H 2005A&A...436..687H
ADC_Keywords: Magellanic Clouds ; Stars, dwarfs ; Abundances, peculiar ;
Spectra, ultraviolet
Keywords: stars: abundances - stars: atmospheres - stars: early-type -
galaxies: individual: Small Magellanic Cloud
Abstract:
An analysis of high-resolution VLT/UVES spectra of two B-type main
sequence stars, NGC 346-11 and AV 304, in the Small Magellanic Cloud
(SMC), has been undertaken, using the non-LTE TLUSTY model atmospheres
to derive the stellar parameters and chemical compositions of each
star. The chemical compositions of the two stars are in reasonable
agreement. Moreover, our stellar analysis agrees well with earlier
analyses of HII regions. The results derived here should be
representative of the current base-line chemical composition of the
SMC interstellar medium as derived from B-type stars.
Description:
High-resolution spectra have been obtained for both NGC 346-11 and
AV 304 using the Ultraviolet and Visual Echelle Spectrograph, UVES, on
the UT2 (Kueyen) telescope at the European Southern Observatory.
NGC 346-11 was observed during a three night run in November 2001,
whilst the observations of AV 304, taken during a two night run in
January 2001, have been previously discussed by Rolleston et al.
(2003A&A...400...21R 2003A&A...400...21R).
Objects:
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RA (2000) DE Designation(s)
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00 58 13.9 -72 09 19 NGC346-11 = Cl* NGC 346 MPG 11
01 02 24. -72 39.0 AV304 = AzV 304
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 31 70 The equivalent widths and derived abundances for
the metal lines observed in the spectra of
AV 304 and NGC 346-11
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Ion Species
8- 13 F6.1 0.1nm lambda Wavelength (1)
15- 17 I3 0.1pm EW(AV304) ?=- AV 403 ion equivalent width (2)
19- 22 F4.2 Sun A(AV304) ?=- AV 403 ion abundance
24- 26 I3 0.1pm EW(NGC346-11) ?=- NGC346-11 ion equivalent width (3)
28- 31 F4.2 Sun A(NGC346-11) ?=- NGC346-11 ion abundance
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Note (1): The wavelengths of unresolved blends of lines are quoted to the
nearest Angstroem.
Note (2): The equivalent widths of the spectral lines in AV 304 have been
obtained from Rolleston et al. (2003A&A...400...21R 2003A&A...400...21R).
Note (3): The equivalent widths of the spectral lines in NGC 346-11 have been
measured using the line fitting program ELF in the spectral analysis
package DIPSO (Howarth et al., 1994, Starlink User Note, No. 50.15).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Jul-2006