J/AJ/143/28 Analysis of B6-A9 stars from INES UV spectra (Freire+, 2012)
High ionization species in the nearby interstellar medium from an exhaustive
analysis of the IUE INES database.
Freire Ferrero R., Morales Duran C., Halbwachs J.-L., Cabo Cubeiro A.M.
<Astron. J., 143, 28 (2012)>
=2012AJ....143...28F 2012AJ....143...28F
ADC_Keywords: Stars, A-type ; Stars, B-type ; Stars, giant ; Spectral types ;
Interstellar medium ; Spectra, ultraviolet
Keywords: astronomical databases: miscellaneous - circumstellar matter -
ISM: bubbles - ISM: individual objects (Loop I) - ultraviolet: ISM
Abstract:
Main-sequence (MS) and giant late-B and early-A type stars are the
best targets for searching for nearby interstellar (IS) SiIV and CIV
resonance lines because they are not able to produce them, either in
atmospheric layers or in their circumstellar environment, and because
many stars of these spectral types are nearby and located in the local
interstellar medium (LISM). In addition, the use of certain stars
hotter than B6 can lead to misinterpretations (e.g., alpha Arae). This
work analyzes the reliable Short-Wavelength Prime (SWP)
high-resolution UV spectra of 558 B6-A9 type stars observed by the
International Ultraviolet Explorer at distances lower than 400pc from
the Sun. For the first time, this work utilizes the entire INES
database to extract stellar and IS information in a systematic way
from homogeneous data. Stars were classified into seven groups: normal
(MS and subgiant), giant, peculiar, emission line, Algols, pre-main
sequence or Herbig Ae/Be, and shell stars. Only 10 normal stars,
located beyond 90pc, show weak SiIV and CIV absorptions and are
clustered around the direction of Sco-Cen, while 85 located closer
than 90pc, as well as another 89 beyond 90pc, do not show any
absorptions at all.
Description:
From the SIMBAD and the INES (IUE Newly Extracted Spectra) databases
we analyze the UV high-resolution SWP (Short-Wavelength Prime) spectra
of all the stars observed by IUE (International Ultraviolet Explorer)
with spectral types of B6-A9 (late-B and early-A) and luminosity
classes of III to V. The INES database was elaborated at VILSPA -
ESA's Villafranca Satellite Tracking Station (Wamsteker et al.,
2000Ap&SS.273..155W 2000Ap&SS.273..155W).
The IUE instrumental resolution of the high-dispersion spectra in the
INES database was 7km/s at 140nm. We consider a boxcar smoothing at
3-5 pixels, which gives rise to a final resolution of 0.01-0.0175nm or
22.5-37.5km/s at 140nm.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 99 558 IUE images used in our sample of 558 stars
(B6-A9: luminosity classes III to V)
table2.dat 93 558 Final selected stars
(B6-A9: Luminosity Classes III to V)
table3.dat 107 988 Stars rejected from our sample
table8.dat 48 558 Relative flux errors and S/N ratios for both
SiIV and CIV wavelengths for all "+ +" stars
table14.dat 67 53 Interstellar column densities of SiIV and CIV
(this work)
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See also:
III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)
VI/110 : Final Merged Log of IUE Observations (NASA-ESA, 2000)
III/188 : IUE Atlas of B-Type Stellar Spectra (Walborn+ 1995)
III/17 : Early-Type Emission-Line Stars (Wackerling 1970)
J/ApJS/186/175 : Far-UV spectroscopic atlas of B stars (Smith, 2010)
J/A+A/463/671 : Rotational velocities of A-type stars. III. (Royer+, 2007)
J/AJ/129/856 : Herbig Ae/Be stars in OB associations (Hernandez+, 2005)
J/ApJS/147/305 : IUE atlas of pre-main-sequence stars (Valenti+, 2003)
J/A+A/381/105 : Rotational velocities of A-type stars. I. (Royer+, 2002)
J/A+A/393/897 : Rotational velocities of A-type stars II. (Royer+, 2002)
J/ApJ/573/359 : Rotational velocities of B stars from BSC (Abt+, 2002)
J/A+A/378/116 : Classification & vsini of Vega-type & PMS stars (Mora+, 2001)
J/A+AS/118/481 : ROSAT all-sky survey catalogue of OB stars (Berghoefer+ 1996)
J/ApJS/99/135 : Rotation and Spectral Peculiarities (Abt+ 1995)
J/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994)
J/A+AS/105/305 : OB stars observed with high dispersion by IUE (Bohlin+ 1994)
http://sdc.cab.inta-csic.es/ines/ : INES home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name (mainly HDNNNNNN or BD and CD)
11- 18 A8 --- SWP1 IUE/SWP identifier of spectrum (SWPNNNNN) (1)
20- 27 A8 --- SWP2 ? 2nd IUE/SWP id of spectrum (SWPNNNNN) (1)
29- 36 A8 --- SWP3 ? 3rd IUE/SWP id of spectrum (SWPNNNNN) (1)
38- 45 A8 --- SWP4 ? 4th IUE/SWP id of spectrum (SWPNNNNN) (1)
47- 54 A8 --- SWP5 ? 5th IUE/SWP id of spectrum (SWPNNNNN) (1)
56- 63 A8 --- SWP6 ? 6th IUE/SWP id of spectrum (SWPNNNNN) (1)
65- 72 A8 --- SWP7 ? 7th IUE/SWP id of spectrum (SWPNNNNN) (1)
74- 81 A8 --- SWP8 ? 8th IUE/SWP id of spectrum (SWPNNNNN) (1)
83- 90 A8 --- SWP9 ? 9th IUE/SWP id of spectrum (SWPNNNNN) (1)
92- 99 A8 --- SWP10 ? 10th IUE/SWP id of spectrum (SWPNNNNN) (1)
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Note (1): Short-Wavelength Prime (SWP) spectra from the entire IUE Newly
Extracted Spectra (INES) archive
(http://sdc.cab.inta-csic.es/ines/index2.html).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 I1 --- Gr [1/7] Stellar group (1)
3- 11 A9 --- Name Star name (mainly HD)
13- 25 A13 --- OName Other star name
27- 36 A10 --- SpT Selected MK spectral type
38- 43 F6.2 deg GLON Galactic longitude; (ep=2000 eq=2000)
45- 50 F6.2 deg GLAT Galactic latitude; (ep=2000 eq=2000)
52- 57 F6.3 mag Vmag [-1.44/10.66]? Johnson V band magnitude
59- 64 F6.3 mag (B-V) ? The (B-V) color index
66- 71 F6.1 pc Dist [2.6/5000] Stellar distance (2)
73- 79 F7.1 pc e_Dist Error in Dist
80 A1 --- f_Dist [*] *=distance deduced from distance modulus
82 A1 --- l_vsini [<] Limit flag on vsini
83- 85 I3 km/s vsini [0/455]? Stellar rotational velocity (3)
87- 88 I2 --- N [1/10] Number of IUE observations used
89 A1 --- f_N [S] small-aperture only spectra (4)
91 A1 --- Si [+?-] SiIV line detection? (5)
93 A1 --- C [+?-] CIV line detection? (5)
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Note (1): Classification in the following groups:
1 = Normal main sequence (MS) and normal subgiant stars (B6-A9 IV, IV-V
and V) (227 stars);
2 = Ap, Bp and Am stars (164 stars);
3 = Giant stars (B6-A9 III) (42 stars);
4 = Emission line (i.e., Hα, Balmer series, Fe II visible lines)
stars (i.e. Be) (69 stars);
5 = Algol stars (25 stars);
6 = Pre-main sequence (PMS) or Herbig Ae/Be (HAEBE) stars (13 stars);
7 = Shell stars (18 stars).
Note (2): We used the Hipparcos parallaxes when available, or computed distances
from the stellar spectral class and the estimated color excess.
See section 2.3.
Note (3): Individual vsin i error values are not specified: in general, they
could be 100% for vsin i<10km/s, 10% for vsin i>20km/s,
and 15% or more, up to 150km/s.
Note (4):
S = "Small aperture". There is no available large aperture spectra
thus we used a non-saturated small-aperture spectrum with the longest
exposure time.
Note (5): Detection flags:
+ = positive detection;
? = doubtful detection;
- = negative detection.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1 A1 --- f_Name [a-c] Star grouping (1)
3- 20 A18 --- Name Our catalog astronomical object designation
(mainly HD)
22- 42 A21 --- SName SIMBAD astronomical object designation
44- 46 A3 --- Type SIMBAD Object type (2)
48- 49 I2 h RAh Hour of Right Ascension (J2000)
51- 52 I2 min RAm Minute of Right Ascension (J2000)
54- 60 F7.4 s RAs Second of Right Ascension (J2000)
62 A1 --- DE- Sign of the Declination (J2000)
63- 64 I2 deg DEd Degree of Declination (J2000)
66- 67 I2 arcmin DEm Arcminute of Declination (J2000)
69- 74 F6.3 arcsec DEs Arcsecond of Declination (J2000)
76- 81 F6.3 mag Bmag [0.09/15.117]? SIMBAD Johnson B band magnitude
83- 88 F6.3 mag Vmag [0.12/18]? SIMBAD Johnson V band magnitude
90-102 A13 --- SpT SIMBAD MK spectral type
104-107 I4 --- Nref Number of SIMBAD references
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Note (1): Stars rejected from our sample because of the following reasons:
a = Stars with IUE high resolution SWP observations but very low flux.
b = Stars without IUE observations in high resolution in the short
wavelength camera.
c = Stars with IUE observations but spectral type outside our spectral type
range B6-A9 III-V.
Note (2): See the extended explanations of the SIMBAD object types
http://simbad.u-strasbg.fr/simbad/sim-display?data=otypes
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name (mainly HD)
11- 12 I2 --- N [1/10] Number of observed spectra
14- 18 F5.2 --- mSN(C) Median of the CIV S/N of spectra used (1)
20- 24 F5.2 --- S/N(C) CIV S/N of the median of different spectra (2)
26- 30 F5.3 --- e(C) [0.01/2.4]? CIV relative flux error (3)
32- 36 F5.2 --- mSN(Si) Median of the SiIV S/N of spectra used (1)
38- 42 F5.2 --- S/N(Si) SiIV S/N of the median of different spectra (2)
44- 48 F5.3 --- e(Si) [0.01/6.1]? SiIV relative flux error (3)
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Note (1): The median of all values of S/N corresponding to all spectra used
of a star.
Note (2): The SN value of the median spectrum of all the spectra used of a star.
Note (3): Equal to σflux/fluxλ.
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Byte-by-byte Description of file: table14.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Star name (1)
14- 21 I8 pc D [93/10000000] Star distance
23 A1 --- n_D [*] distance from recent bibliography
25- 29 F5.3 [pc] logD log of the distance; used in Fig. 9
31- 36 F6.3 [cm-2] logSi [11.2/14.4]? Log of the SiIV column density
38- 42 F5.3 [cm-2] E_logSi ? Upper standard deviation in logSi
44- 48 F5.3 [cm-2] e_logSi ? Lower standard deviation in logSi
50- 55 F6.3 [cm-2] logC [12.1/14.8] Log of the CIV column density
57- 61 F5.3 [cm-2] E_logC ? Upper standard deviation in logC
63- 67 F5.3 [cm-2] e_logC ? Lower standard deviation in logC
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Note (1): The first 10 rows contain data from this work; the others are data
from Sembach, Savage and Tripp (1997ApJ...480..216S 1997ApJ...480..216S).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 08-Apr-2013