J/MNRAS/367/1478 Interstellar NaI, TiII & CaIIK obs. (Hunter+, 2006)
Early-type stars observed in the ESO UVES Paranal Observatory Project -
I. Interstellar NaI UV, TiII and CaII K observations.
Hunter I., Smoker J.V., Keenan F.P., Ledoux C., Jehin E., Cabanac R.,
Melo C., Bagnulo S.
<Mon. Not. R. Astron. Soc., 367, 1478-1514 (2006)>
=2006MNRAS.367.1478H 2006MNRAS.367.1478H
ADC_Keywords: Interstellar medium ; Ultraviolet ; Spectroscopy ;
Stars, early-type
Keywords: stars: early-type - ISM: abundances - ISM: clouds - ISM: general -
ISM: structure
Abstract:
We present an analysis of interstellar NaI (λair=3302.37 and
3302.98Å), TiII (λair=3383.76Å) and CaIIK
(λair=3933.66Å) absorption features for 74 sightlines
towards O- and B-type stars in the Galactic disc. The data were
obtained from the Ultraviolet and Visual Echelle Spectrograph Paranal
Observatory Project (UVES POP), at a spectral resolution of 3.75km/s
and with mean signal-to-noise ratios per pixel of 260, 300 and 430 for
the NaI, TiII and CaII observations, respectively. Interstellar
features were detected in all but one of the TiII sightlines and all
of the CaII sightlines. The dependence of the column density of these
three species with distance, height relative to the Galactic plane, HI
column density, reddening and depletion relative to the solar
abundance has been investigated. We also examine the accuracy of using
the NaI column density as an indicator of that for HI. In general, we
find similar strong correlations for both Ti and Ca, and weaker
correlations for Na. Our results confirm the general belief that Ti
and Ca occur in the same regions of the interstellar medium (ISM) and
also that the TiII/CaII ratio is constant over all parameters. We
hence conclude that the absorption properties of Ti and Ca are
essentially constant under the general ISM conditions of the Galactic
disc.
Description:
We have extracted spectra for three interstellar species, namely the
NaI UV doublet, TiII and CaII K along the sightlines to 74 O- and
B-type field stars from An Atlas of High-Resolution Spectra of Stars
across the Hertzsprung-Russell Diagram, available from the Ultraviolet
and Visual Echelle Spectrograph Paranal Observatory Project.
The spectra presented in this paper are the merged versions of the POP
survey available online at http://www.eso.org/uvespop .
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 70 74 The stellar sample and basic parameters
table3.dat 201 528 Component table
table4.dat 130 74 *Total column density
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Note on table4.dat: Total column density derived by the summation of the
individual interstellar components listed in Table 3. We also present the
total derived by the apparent optical depth (AOD) method, discussed
in Section 3.4.
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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- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD number
12- 17 F6.2 deg GLON Galactic longitude
19- 24 F6.2 deg GLAT Galactic latitude
27- 41 A15 --- SpType MK spectral type
43- 46 F4.2 mag VMAG Absolute V magnitude
48- 52 F5.2 mag B-V B-V colour index
54- 58 F5.2 mag E(B-V) Reddening
60- 63 I4 pc Dist Distance (1)
64 A1 --- r_Dist [a-f] Distance reference (2)
66- 70 I5 pc z Distance above the plane
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Note (1): Distances for the majority of the stars were calculated
spectroscopically and errors are of the order of 25 per cent,
excluding systematic errors. For some objects the distance was taken
from the literature, references to which are given in r_Dist.
Note (2): References as follows:
a = Diplas & Savage (1994, Cat. J/ApJS/93/211)
b = Fruscione et al. (1994, Cat. J/ApJS/94/127)
c = Hoekzema et al. (1993, Cat. J/A+AS/98/505)
d = Winkler (1997MNRAS.287..481W 1997MNRAS.287..481W)
e = Conti & Vacca (1990AJ....100..431C 1990AJ....100..431C)
f = Conti et al. (1983ApJ...274..302C 1983ApJ...274..302C)
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD number
10- 11 A2 --- n_HD Note on Name (1)
12- 13 I2 --- m_HD Component number
15- 20 F6.1 km/s vNaI1 ?=- NaI (3302.37) LSR velocity
22- 24 F3.1 km/s e_vNaI1 ?=- rms uncertainty on vNaI1
26- 29 F4.1 --- bNaI1 ?=- NaI (3302.37) Gaussian velocity
dispersion parameter
31- 34 F4.1 --- e_bNaI1 ?=- rms uncertainty on bNaI1
37 A1 --- l_EWNaI1 Limit flag on EWNaI1
38- 41 F4.1 0.1nm EWNaI1 ?=- NaI (3302.37) equivalent width
43- 45 F3.1 0.1nm e_EWNaI1 ?=- rms uncertainty on EWNaI1
47 A1 --- l_logNNaI1 Limit flag on logNNaI1
48- 52 F5.2 [cm-2] logNNaI1 ?=- NaI (3302.37) column density
54- 57 F4.2 [cm-2] e_logNNaI1 ? rms uncertainty on logNNaI1
59- 63 F5.1 km/s vNaI2 ?=- NaI (3302.98) LSR velocity
65- 67 F3.1 km/s e_vNaI2 ?=- rms uncertainty on vNaI2
69- 72 F4.1 --- bNaI2 ?=- NaI (3302.98) Gaussian velocity
dispersion parameter
74- 77 F4.1 --- e_bNaI2 ?=- rms uncertainty on bNaI2
79 A1 --- l_EWNaI2 Limit flag on EWNaI2
80- 83 F4.1 0.1nm EWNaI2 ?=- NaI (3302.98) equivalent width
85- 87 F3.1 0.1nm e_EWNaI2 ? rms uncertainty on EWNaI2
89 A1 --- l_logNNaI2 Limit flag on logNNaI2
90- 94 F5.2 [cm-2] logNNaI2 ?=- NaI (3302.98) column density
96- 99 F4.2 [cm-2] e_logNNaI2 ? rms uncertainty on logNNaI2
101-106 F6.1 km/s vTiII ?=- TiII (3383.76) LSR velocity
108-111 F4.1 km/s e_vTiII ?=- rms uncertainty on vTiII
113-116 F4.1 --- bTiII ?=- TiII (3383.76) Gaussian velocity
dispersion parameter
118-121 F4.1 --- e_bTiII ?=- rms uncertainty on bTiII
123 A1 --- l_EWTiII Limit flag on EWTiII
124-127 F4.1 0.1nm EWTiII ?=- TiII (3383.76) equivalent width
129-131 F3.1 0.1nm e_EWTiII ? rms uncertainty on EWTiII
133 A1 --- l_logNTiII Limit flag on logNTiII
134-138 F5.2 [cm-2] logNTiII ?=- TiII (3383.76) column density
140-143 F4.2 [cm-2] e_logNTiII ? rms uncertainty on logNTiII
145-150 F6.1 km/s vCaII ?=- CaII (3393.66) LSR velocity
152-154 F3.1 km/s e_vCaII ? rms uncertainty on vCaII
156-159 F4.1 --- bCaII ?=- CaII (3393.66) Gaussian velocity
dispersion parameter
161-164 F4.1 --- e_bCaII ?=- rms uncertainty on bCaII
166 A1 --- l_EWCaII Limit flag on EWCaII
167-171 F5.1 0.1nm EWCaII ?=- CaII (3393.66) equivalent width
173-176 F4.1 0.1nm e_EWCaII ? rms uncertainty on EWCaII
178 A1 --- l_logNCaII Limit flag on logNCaII
179-183 F5.2 [cm-2] logNCaII ?=- CaII (3393.66) column density
185-188 F4.2 [cm-2] e_logNCaII ? rms uncertainty on logNCaII
190-195 F6.1 km/s Vell Lower value of velocity range over which
upper limits were estimated
197-201 F5.1 km/s Velu Upper value of velocity range over which
upper limits were estimated
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Note (1): Notes as follows:
a = Poor baseline fitting at 3302Å. No sodium components fitted.
b = Stellar contamination removed in Ti and Ca.
c = Stellar Ca line has been fitted and removed.
d = Ca heavily contaminated by stellar profile, only component
velocities given.
e = Components 3-5 and 10 may be stellar.
f = Ti heavily contaminated by stellar profile, not fitted.
g = Stellar lines of unknown width.
h = Sodium lines are in poor agreement.
i = LSR velocity of star unknown.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD number
11- 13 I3 --- S/NNaI1 NaI (3302.37) S/N
15 A1 --- l_logNNaI1p Limit flag on logNNaI1p
16- 20 F5.2 [cm-2] logNNaI1p NaI (3302.37) total column density
from table 3
22- 25 F4.2 [cm-2] e_logNNaI1p ? rms uncertainty on logNNaI1p
27 A1 --- l_logNNaI1A Limit flag on logNNaI1A
28- 32 F5.2 [cm-2] logNNaI1A NaI (3302.37) total column density
derived by AOD method
34- 37 F4.2 [cm-2] e_logNNaI1A ? rms uncertainty on logNNaI1A
39- 41 I3 --- S/NNaI2 NaI (3302.98) S/N
43 A1 --- l_logNNaI2p Limit flag on logNNaI2p
44- 48 F5.2 [cm-2] logNNaI2p NaI (3302.98) total column density
from table 3
50- 53 F4.2 [cm-2] e_logNNaI2p ? rms uncertainty on logNNaI2p
55 A1 --- l_logNNaI2A Limit flag on logNNaI2A
56- 60 F5.2 [cm-2] logNNaI2A NaI (3302.98) total column density
derived by AOD method
62- 65 F4.2 [cm-2] e_logNNaI2A ? rms uncertainty on logNNaI2A
67- 69 I3 --- S/NTiII ?=- TiII (3383.76) S/N
71 A1 --- l_logNTiIIp Limit flag on logNTiIIp
72- 76 F5.2 [cm-2] logNTiIIp ?=- TiII (3383.76) total column density
from table 3
78- 81 F4.2 [cm-2] e_logNTiIIp ? rms uncertainty on logNTiIIp
83 A1 --- l_logNTiIIA Limit flag on logNTiIIA
84- 88 F5.2 [cm-2] logNTiIIA ?=- TiII (3383.76) total column density
derived by AOD method
90- 93 F4.2 [cm-2] e_logNTiIIA ? rms uncertainty on logNTiIIA
95- 97 I3 --- S/NCaII ?=- CaII (3393.66) S/N
99-103 F5.2 [cm-2] logNCaIIp ?=- CaII (3393.66) total column density
from table 3
105-108 F4.2 [cm-2] e_logNCaIIp ? rms uncertainty on logNCaIIp
110-114 F5.2 [cm-2] logNCaIIA ?=- CaII (3393.66) total column density
derived by AOD method
116-119 F4.2 [cm-2] e_logNCaIIA ? rms uncertainty on logNCaIIA
121-125 F5.2 [cm-2] logNHI ?=- HI total column density
127-130 F4.2 [cm-2] e_logNHI ? rms uncertainty on logNHI
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Oct-2006