J/ApJS/216/22 3060-3700Å spectra analysis of early-type stars (Bhatt+, 2015)
A sensitive spectral survey of interstellar features in the Near-UV
[3050-3700 Å].
Bhatt N.H., Cami J.
<Astrophys. J. Suppl. Ser., 216, 22 (2015)>
=2015ApJS..216...22B 2015ApJS..216...22B
ADC_Keywords: Interstellar medium ; Spectra, ultraviolet ; Stars, early-type
Keywords: ISM: atoms; ISM: molecules; line: identification;
methods: observational; stars: early-type
Abstract:
We present a comprehensive and sensitive unbiased survey of
interstellar features in the near-UV range (3050-3700Å). We
combined a large number of VLT/UVES archival observations of a sample
of highly reddened early-type stars -typical diffuse interstellar band
targets- and unreddened standards. We stacked the individual
observations to obtain a reddened "superspectrum" in the interstellar
rest frame with a signal-to-noise ratio exceeding 1500. We compared
this to the analogous geocentric and stellar rest frame superspectra
as well as to an unreddened superspectrum to find interstellar
absorption features. We find 30 known features (11 atomic and 19
molecular) and tentatively detect up to 7 new interstellar absorption
lines of unknown origin. Our survey is sensitive to narrow and weak
features; telluric residuals preclude us from detecting broader
features. For each sightline, we measured fundamental parameters
(radial velocities, line widths, and equivalent widths) of the
detected interstellar features. We also revisit upper limits for the
column densities of small, neutral polycyclic aromatic hydrocarbon
molecules that have strong transitions in this wavelength range.
Description:
For most of our targets, we obtained fully reduced spectra from the
UVES-ESO reprocessed archive. The UVES instrument mounted on the VLT
is ideally suited since it covers the range ∼3000-11000Å at high
spectral resolution.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 92 108 Basic data of our targets and observations
tablea2.dat 78 1243 Lines of sight measurements
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See also:
B/eso : ESO Science Archive Catalog (ESO, 1991-2015)
III/164 : Catalog of Eq.Widths of Interstellar 217nm Band (Friedemann 1992)
II/135 : Suppl. to Diffuse Interstellar Band Measurements (Guarinos 1988)
II/114 : UV Interstellar Extinction (Savage+ 1985)
II/149 : Diffuse Interstellar Band Measurements (Snow+ 1977)
III/39 : UV Bright Star Spectrophotometric Catalog (Jamar+, 1976)
J/A+A/544/A136 : Diffuse Interstellar Bands in 150 stars (Raimond+, 2012)
J/ApJS/199/8 : Interstellar column densities compil. (Gudennavar+, 2012)
J/MNRAS/404/1321 : TiII in Milky way and Magellanic clouds (Welty+, 2010)
J/A+A/510/A54 : NaI and CaII interstellar absorption (Welsh+, 2010)
J/ApJ/705/32 : Diffuse interstellar bands from HD 183143 (Hobbs+, 2009)
J/A+A/501/297 : Effective temperatures of B Supergiants (Zorec+, 2009)
J/MNRAS/390/1733 : CN column densities & excitation temperatures (Slyk+, 2008)
J/ApJ/663/320 : IR-through-UV extinction curve (Fitzpatrick+, 2007)
J/MNRAS/367/1478 : Interstellar NaI, TiII + CaIIK obs. (Hunter+, 2006)
J/ApJS/147/61 : Interstellar Ca I absorption (Welty+, 2003)
J/A+A/411/447 : Interstellar NaI D-line (Lallement+, 2003)
J/BaltA/11/1 : Interstellar extinction curves of OB stars (Wegner 2002)
J/A+AS/118/481 : ROSAT all-sky survey cat. of OB stars (Berghoefer+ 1996)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Target name
12- 19 A8 --- SpT SIMBAD MK spectral type
21- 22 I2 h RAh Hour of right ascension (J2000)
24- 25 I2 min RAm Minute of right ascension (J2000)
27- 31 F5.2 s RAs Second of right ascension (J2000)
33 A1 --- DE- Sign of declination (J2000)
34- 35 I2 deg DEd Degree of declination (J2000)
37- 38 I2 arcmin DEm Arcminute of declination (J2000)
40- 44 F5.2 arcsec DEs Arcsecond of declination (J2000)
46- 49 F4.2 --- E(B-V) [0/1.6]? Reddening
51 A1 --- r_E(B-V) E(B-V) reference (1)
53- 55 I3 km/s RV [-71/43]? SIMBAD heliocentric radial velocity
56 A1 --- f_RV [*] Estimated RV (2)
58- 62 F5.1 km/s Vism [-22.4/25.2]? Radial velocity from NaI line (3)
64- 68 F5.1 km/s Vism2 ? Vism from literature (3)
70- 71 A2 --- r_Vism2 Vism2 reference (1)
73- 74 I2 --- No [1/18]? Number of observation(s) (4)
76- 85 A10 --- ProgID Program ID (5)
87- 89 I3 --- S/N [33/499]? Signal-to-noise ratio estimated from
the co-added spectra between 3450-3452Å
91- 92 A2 --- Type Target type (R=reddened; ST=unreddened standard)
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Note (1): Reference as follows:
a = Snow et al. 1977, Cat. II/149
b = Walborn et al. 1980PASP...92..284W 1980PASP...92..284W
c = Hunter et al. 2006, Cat. J/MNRAS/367/1478
d = Crawford, I.A. 1989Obs...109..232C 1989Obs...109..232C
e = Savage et al. 1985, Cat. II/114
f = Fitzpatrick & Massa 2007, Cat. J/ApJ/663/320
g = Guarinos 1988, Cat. II/135
h = Friedemann 1992, Cat. III/164
i = Wegner 2002, Cat. J/BaltA/11/1
j = Slyk et al. 2008, Cat. J/MNRAS/390/1733
k = Gudennavar et al. 2012, Cat. J/ApJS/199/8
l = Berghoefer et al. 1996, Cat. J/A+AS/118/481
m = Zorec et al. 2009, Cat. J/A+A/501/297
n = Jamar et al. 1976, Cat. III/39
o = Raimond et al. 2012, Cat. J/A+A/544/A136
u = estimated using Fitzgerald (1970A&A.....4..234F 1970A&A.....4..234F) and SIMBAD database
aa = Welty et al. 2003, Cat. J/ApJS/147/61
bb = Vos et al. 2011A&A...533A.129V 2011A&A...533A.129V
cc = Welty & Hobbs 2001ApJS..133..345W 2001ApJS..133..345W
Note (2):
* = Estimated by cross-correlating target against synthetic spectrum of
hydrogen and helium lines.
Note (3): Measured using strongest component of NaI line at 3302.368Å.
Compared to literature values where possible.
Note (4): The number of distinct observations co-added to create the optimal
spectrum of the target.
Note (5): The observations came from 27 different observing programs:
65.I-0526 (PI: E. Roueff); 67.C-0281 (PI: P. Ehrenfreund);
67.D-0384 (PI: J. Orosz); 67.D-0439 (PI: F. Primas);
68.D-0094 (PI: F. Primas); 68.D-0237 (PI: F. Primas);
68.D-0323 (PI: L. Dessart); 68.D-0546 (PI: M. Asplund);
69.A-0204 (PI: V. D'Odorico); 71.B-0529 (PI: D. Silva);
71.C-0513 (PI: M. Andre); 71.D-0155 (PI: L. Pasquini);
072.D-0410 (PI: S. Bagnulo); 073.B-0607 (PI: D. Silva);
073.D-0504 (PI: S. Hubrig); 074.B-0639 (PI: D. Silva);
074.C-0134 (PI: N.C. Santos); 076.B-0055 (PI: D. Silva);
076.D-0169 (PI: C.R. Cowley); 076.D-0546 (PI: N. Christlieb);
079.C-0597 (PI: R. Gredel); 079.D-0567 (PI: D. Silva);
082.C-0566 (PI: Beletsky); 087.B-0308 (PI: P. Coelho);
266.D-5655 (PI: Paranal Observatory); 267.B-5698 (PI: D. Hutsmekers);
268.D-5738 (PI: G.M. Wahlgren).
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Target identifier
12- 16 A5 --- Species Species identifier (1)
18- 25 F8.3 0.1nm lambda [3065.9/3679.9]? Heliocentric wavelength;
in Angstroms
27- 31 F5.3 0.1nm e_lambda [0.001/0.05]? Uncertainty in lambda
33- 37 F5.1 km/s HRV [-51.9/32.4]? Heliocentric velocity
39- 41 F3.1 km/s e_HRV [0.1/4.3]? Uncertainty in HRV
43- 49 F7.2 10-13m EW [0.06/157] Equivalent width (mÅ) (2)
51- 55 F5.2 10-13m e_EW [0/27.3] Uncertainty in EW
56 A1 --- f_EW Multicomponent feature (3)
58- 62 F5.1 10-13m FWHM ? Full-Width at Half-Maximum (mÅ)
64- 67 F4.1 10-13m e_FWHM ? Uncertainty in FWHM
69- 73 F5.2 km/s FWHMv ? Full-Width at Half-Maximum expressed in
velocity units
75- 78 F4.2 km/s e_FWHMv ? Uncertainty in FWHMv
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Note (1): In the case of the Ti II lines, we have first measured the strongest
feature at 3383.768 A, and then fixed the widths and central
velocities of components when fitting the other Ti II transitions.
For these lines, the uncertainties will correspond to the
uncertainties of the 3383.768 Angstrom feature, and therefore are not
repeated in the table. The measurements of the 3146.010 Angstrom CH
line should be taken with caution - we noticed systematic issues
here: the wavelength calibration, and perhaps other reduction issues
have compromised this region.
Note (2): The equivalent widths listed are determined analytically from the
Gaussian parameters.
Note (3):
] = A multi-component feature where EqWid was integrated across the
entire profile.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 04-Mar-2015