J/A+A/411/447 Interstellar NaI D-line (Lallement+, 2003)
3D mapping of the dense interstellar gas around the Local Bubble
Lallement R., Walsh B.Y., Vergely J.L., Crifo F., Sfeir D.
<Astron. Astrophys. 411, 447 (2003)>
=2003A&A...411..447L 2003A&A...411..447L
ADC_Keywords: Interstellar medium ; Molecular clouds ; Equivalent widths
Keywords: Galaxy: solar neighborhood - ISM: atoms - ISM: clouds
Abstract:
We present intermediate results from a long-term program of mapping
the neutral absorption characteristics of the local interstellar
medium, motivated by the availability of accurate and consistent
parallaxes from the Hipparcos satellite. Equivalent widths of the
interstellar NaI D-line doublet at 5890Å are presented for the
lines-of-sight towards some 311 new target stars lying within ∼350pc
of the Sun. Using these data, together with NaI absorption
measurements towards a further ∼240 nearby targets published in the
literature (for many of them, in the directions of molecular clouds),
and the ∼450 lines-of-sight already presented by (Sfeir et al., 1999,
Cat. J/A+A/346/785), we show 3D absorption maps of the local
distribution of neutral gas towards 1005 sight-lines with Hipparcos
distances as viewed from a variety of different galactic projections.
The data are synthesized by means of two complementary methods, (i) by
mapping of iso-equivalent width contours, and (ii) by density
distribution calculation from the inversion of column-densities, a
method devised by Vergely et al. (2001A&A...366.1016V 2001A&A...366.1016V). Our present
data confirms the view that the local cavity is deficient in cold and
neutral interstellar gas. The closest dense and cold gas "wall", in
the first quadrant, is at ∼55-60pc. There are a few isolated clouds at
closer distance, if the detected absorption is not produced by
circumstellar material.
The observations were obtained during 11 observing runs over the
period 1998-2000.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 311 Stellar Targets and NaI Equivalent Width
Measurements
table2.dat 41 239 Other NaI observations published since Paper I,
Sfeir et al, 1999, Cat. J/A+A/346/785
refs.dat 68 23 References
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See also:
J/A+A/346/785 : NaI in Local Bubble (Sfeir+, 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name
11- 15 F5.1 deg GLON Galactic longitude
17- 21 F5.1 deg GLAT Galactic latitude
23- 27 F5.1 pc Dist Hipparcos distance
29- 35 A7 --- SpType MK Spectral type
37- 39 F3.1 mag Vmag V magnitude
41 A1 --- l_W(D2) Limit flag on W(D2)
42- 46 F5.1 0.1nm W(D2) Equivalent width of interstellar sodium D2 line
48 A1 --- l_W(D1) Limit flag on W(D1)
49- 53 F5.1 0.1nm W(D1) ? Equivalent width of interstellar sodium D1 line
54 A1 --- n_W(D1) [n] n: not analysed
57- 71 A15 --- Obs Observatory/Date
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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- 10 A10 --- Star Star name
12- 17 F6.2 deg GLON Galactic longitude
19- 24 F6.2 deg GLAT Galactic latitude
26- 28 I3 pc Dist Distance
30- 32 I3 0.1nm W(D2) Equivalent width of interstellar sodium D2 line
34- 36 I3 0.1nm W(D1) ? Equivalent width of interstellar sodium D1 line
38- 42 A5 --- r_W(D2) References, in refs.dat file
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 41 A18 --- Aut Author's name
44- 68 A25 --- Com Comments
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Acknowledgements: Rosine Lallement
(End) Patricia Bauer [CDS] 23-Aug-2003