J/A+A/578/A109 Spectra of 12 ON stars (Martins+, 2015)
Surface abundances of ON stars.
Martins F., Simon-Diaz S., Palacios A., Howarth I., Georgy C., Walborn N.,
Bouret J.-C., Barba R.
<Astron. Astrophys. 578, A109 (2015)>
=2015A&A...578A.109M 2015A&A...578A.109M
ADC_Keywords: Stars, O ; Stars, double and multiple ; Spectroscopy
Keywords: stars: massives - stars: abundances - stars: evolution -
stars: atmospheres
Abstract:
Massive stars burn hydrogen through the CNO cycle during most of their
evolution. When mixing is efficient or when mass transfer in binary
systems occurs, chemically processed material is observed at the
surface of O and B stars.
ON stars show stronger lines of nitrogen than morphologically normal
counterparts. Whether this corresponds to the presence of material
processed through the CNO cycle is not known. Our goal is to answer
this question.
We performed a spectroscopic analysis of a sample of ON stars with
atmosphere models. We determined the fundamental parameters as well as
the He, C, N, and O surface abundances. We also measured the projected
rotational velocities. We compared the properties of the ON stars to
those of normal O stars.
Description:
Normalized optical spectra of the twelve stars analyzed in the paper.
Each file contains two columns: the first one gives the wavelength
(in Å); the second one gives the normalized flux.
The spectroscopic data were collected from a number of archives and
unpublished material.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 80 12 Observational information
sp/* . 12 Individual spectra
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See also:
III/274 : Galactic O-Star Spectroscopic Survey (Sota+, 2014)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [HD]
4- 9 I6 --- HD Star number in HD catalogue
12- 13 I2 h RAh Simbad right ascension (J2000)
15- 16 I2 min RAm Simbad right ascension (J2000)
18- 22 F5.2 s RAs Simbad right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 34 F4.1 arcsec DEs Declination (J2000)
36- 47 A12 --- SpType MK spectral type (1)
49- 56 A8 --- Inst Instrument (2)
58- 67 A10 "DD/MM/YYYY" Date Date of observation, or blank for "average"
69- 80 A12 --- FileName Name of the spectrum file in subdirectory sp
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Note (1): Spectral types are from Sota et al. (2011ApJS..193...24S 2011ApJS..193...24S and
2014ApJS..211...10S 2014ApJS..211...10S, Cat. III/274).
Note (2): Instruments are:
UCLES = University College London Echelle Spectrometer at 3.9m AAT
(Anglo-Australian Telescope)
FIES = FIbre-fed Echelle Spectrograph, attached to the 2.5m North Optical
Telescope (NOT).
FEROS = Fiber-fed Extended Range Optical Spectrograph, from ESO Archive
ELODIE = spectrograph at 1.93m telescope at Observatoire de Haute-Provence
ESPaDOnS = spectro-polarimeter at the CFHT Telescope (3.6m)
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 10 F10.5 0.1nm lambda [3564/9217] Wavelength in Angstroe m
12- 23 F12.8 --- NFlux Normalized flux
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Acknowledgements:
Fabrice Martins, fabrice.martins(at)univ-montp2.fr
(End) Patricia Vannier [CDS] 12-May-2015