J/ApJS/202/17 Far-UV spectral atlas of O-type stars (Smith, 2012)
A detailed far-ultraviolet spectral atlas of O-type stars.
Smith M.A.
<Astrophys. J. Suppl. Ser., 202, 17 (2012)>
=2012ApJS..202...17S 2012ApJS..202...17S
ADC_Keywords: Atlases ; Spectra, ultraviolet ; Stars, O ; Line Profiles
Keywords: atlases - line: identification - stars: early-type -
ultraviolet: stars
Abstract:
In this paper, we present a spectral atlas covering the wavelength
interval 930-1188Å for O2-O9.5 stars using Far-Ultraviolet
Spectroscopic Explorer archival data. The stars selected for the atlas
were drawn from three populations: Galactic main-sequence (classes
III-V) stars, supergiants, and main-sequence stars in the Magellanic
Clouds, which have low metallicities. For several of these stars, we
have prepared FITS files comprised of pairs of merged spectra for user
access via the Multimission Archive at Space Telescope (MAST). We
chose spectra from the first population with spectral types O4, O5,
O6, O7, O8, and O9.5 and used them to compile tables and figures with
identifications of all possible atmospheric and interstellar medium
lines in the region 949-1188Å. Our identified line totals for these
six representative spectra are 821 (500), 992 (663), 1077 (749), 1178
(847), 1359 (1001), and 1798 (1392) lines, respectively, where the
numbers in parentheses are the totals of lines formed in the
atmospheres, according to spectral synthesis models. The total number
of unique atmospheric identifications for the six main-sequence O-star
template spectra is 1792, whereas the number of atmospheric lines in
common to these spectra is 300. The number of identified lines
decreases toward earlier types (increasing effective temperature),
while the percentages of "missed" features (unknown lines not
predicted from our spectral syntheses) drop from a high of 8% at type
B0.2, from our recently published B-star far-UV atlas (Cat.
J/ApJS/186/175), to 1%-3% for type O spectra. The percentages of
overpredicted lines are similar, despite their being much higher for
B-star spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 40 25 Star list for O star far-UV spectral atlas
table3.dat 41 4335 Line identifications in O9.5, O8, and O7 spectra
table4.dat 41 2890 Line identifications in O6, O5, and O4 spectra
table6.dat 32 135 Unblended photospheric lines in O9.5-O4 spectra
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See also:
VI/129 : The FUSE Observation Log (FUSE, 1999-2007)
V/116 : Galactic O star catalog (Maiz-Apellaniz+, 2004)
III/115 : IUE Atlas of O-Type Stellar Spectra (Walborn+ 1985)
J/ApJS/186/175 : Far-UV spectroscopic atlas of B stars (Smith, 2010)
J/ApJS/187/149 : StarCAT: STIS UV echelle spectra of stars (Ayres, 2010)
J/ApJ/700/844 : Rotation rates of very massive stars (Penny+, 2009)
J/ApJS/144/21 : Galaxy and Magellanic Clouds OB and WR stars (Robert+, 2003)
J/ApJS/136/631 : IUE absorption toward 164 early-type stars (Savage+, 2001)
J/MNRAS/284/265 : Rotational Velocities of 373 OB stars (Howarth+ 1997)
J/ApJS/99/173 : Synthetic UV spectra of massive stars (Leitherer+ 1995)
J/A+AS/105/305 : OB stars observed with high dispersion by IUE (Bohlin+ 1994)
http://archive.stsci.edu/prepds/fuvostars/ : Supplementary materials for the
FUV atlas of O stars
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- SpC MK spectral type category
6- 15 A10 --- Name Star name
16 A1 --- n_Name [abc] Individual notes (1)
18- 27 A10 --- SpT MK spectral type
29- 31 A3 --- Ref Reference (2)
33- 35 I3 --- vsini Rotational velocity
37- 40 A4 --- r_vsini vsini reference (2)
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Note (1): Flag as follows:
a = Galactic main-sequence stars used for line identification lists.
b = MPG (NGC 346), AV, and Sk stars are located in the Magellanic Clouds.
c = D301-NW8 is also named LMC2-755.
Note (2): Reference as follows:
F88 = Fitzpatrick E.L. 1988ApJ...335..703F 1988ApJ...335..703F;
G77 = Garrison et al. 1977ApJS...35..111G 1977ApJS...35..111G;
G87 = Garmany et al. 1987AJ.....93.1070G 1987AJ.....93.1070G;
J01 = Jaxon et al. 2001PASP..113.1130J 2001PASP..113.1130J;
M73 = Morgan 1973ARA&A..11...29M 1973ARA&A..11...29M;
M95 = Massey et al. 1995ApJ...438..188M 1995ApJ...438..188M;
M04 = Maiz-Apellaniz et al. 2004, Cat. V/116;
M05 = Massey et al. 2005ApJ...627..477M 2005ApJ...627..477M;
R03 = Robert et al. 2003, Cat. J/ApJS/144/21;
S99 = Smith Neubig & Bruhweiler 1999AJ....117.2856S 1999AJ....117.2856S;
W72 = Walborn N.R. 1972AJ.....77..312W 1972AJ.....77..312W;
W73 = Walborn N.R. 1973AJ.....78.1067W 1973AJ.....78.1067W;
W76 = Walborn N.R. 1976ApJ...205..419W 1976ApJ...205..419W;
W77 = Walborn N.R. 1977ApJ...215...53W 1977ApJ...215...53W;
W02 = Walborn et al. 2002ApJS..141..443W 2002ApJS..141..443W;
H97 = Howarth et al. 1997, Cat. J/MNRAS/284/265;
PG09 = Penny & Gies 2009, Cat. J/ApJ/700/844
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Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- SpC MK spectral type category
5 A1 --- --- [,] Delimiter between columns 1 and 2
6- 11 A6 --- Code [ 1-6] Present in star code number(s) (1)
12 A1 --- --- [,] Delimiter between columns 2 and 3
13- 20 F8.3 0.1nm lambda1 ? Primary wavelength; in Angstroms
21 A1 --- --- [,] Delimiter between columns 3 and 4
22- 29 F8.3 0.1nm lambda2 ? Secondary wavelength; in Angstroms
30 A1 --- --- [,] Delimiter between columns 4 and 5
31- 41 A11 --- Ion Ion identification + ISM assignment as needed
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Note (1): For our line identification tables for six main-sequence stars
(flagged "a" in table 1), we assign "star code" values of 1-6 to those
stars in our line identification tables. In our system the value 1
corresponds to subtype O9.5, 2 to O8 (omitting O9), and so on, until
the value 6 is applied to O4. See section 2.1.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 0.1nm lambda [951/1182] Wavelength in Angstroms (λ)
10- 12 F3.1 --- SCO9.5 [0/1.1] Spectral code for O9.5 (1)
14- 16 F3.1 --- SCO8 [0/2.1] Spectral code for O8 (1)
18- 20 F3.1 --- SCO7 [3/3.1] Spectral code for O7 (1)
22- 24 F3.1 --- SCO6 [4/4.1] Spectral code for O6 (1)
26- 28 F3.1 --- SCO5 [0/5.1] Spectral code for O5 (1)
30- 32 F3.1 --- SCO4 [0/6.1] Spectral code for O4 (1)
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Note (1): Integer numbers specify whether the line is visible in the spectrum
of template N or not (zero value). Decimal value ("N.1") specifies
that the line is "self-blended", that is that the next strongest line
within the blend window of ±0.08 Angstroms arises from the same ion.
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History:
From electronic version of the journal
References:
Smith, M.A. Paper I. 2010ApJS..186..175S 2010ApJS..186..175S Cat. J/ApJS/186/175
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 22-Oct-2012