J/ApJS/93/211 IUE survey of H I Lyα absorption. I. (Diplas+ 1994)
An IUE survey of interstellar H I Lyα absorption. I. Column densities.
Diplas A., Savage B.D.
<Astrophys. J. Suppl. Ser. 93, 211 (1994)>
=1994ApJS...93..211D 1994ApJS...93..211D (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, UBV ; Redshifts ; H I data ; Ultraviolet
Mission_Name: IUE
Keywords: ISM: abundances - stars: early-type - ultraviolet: ISM
Abstract:
We measure Galactic interstellar neutral hydrogen column densities by
analyzing archival interstellar Lyα absorption line data toward
554 B2 and hotter stars observed at high resolution with the IUE
satellite. This study more than doubles the number of lines of sight
with measures of N(H I) based on Lyα. We have included the
scattered light background correction algorithm of Bianchi and Bohlin
(1984A&A...134...31B 1984A&A...134...31B) in our data reduction. We use the correlation
between the Balmer discontinuity [c1] index and the stellar
Lyα absorption in order to assess the effects of stellar Ly
alpha contamination. Approximately 40% of the B stars with measured
[c1] index, exhibit serious stellar Lyα contamination. Table 1
contains the derived values of the interstellar N(H I) for 393 stars
with at most small amounts of stellar contamination. Table 2 lists the
observed values of total N(H I) for 161 stars with suspected stellar
Ly alpha contamination and/or uncertain stellar parameters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 121 393 Interstellar atomic hydrogen column densities
table2 120 161 Atomic hydrogen column densities for stars with
suspected stellar Lyman-alpha contamination
and/or uncertain stellar parameters
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See also:
1994ApJ...427..274D 1994ApJ...427..274D : Paper II. Diplas & Savage, (1994)
Byte-by-byte Description of file: table1 table2
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Bytes Format Units Label Explanations
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1- 11 A11 --- HD/BD HD or BD star name
13- 22 A10 --- Name Other name
24- 29 F6.2 deg GLON Galactic longitude
31- 36 F6.2 deg GLAT Galactic latitude
38- 52 A15 --- SpType Spectral type
54- 58 F5.2 mag Vmag ? V magnitude
59 A1 --- u_Vmag Uncertainty flag on Vmag
60- 64 F5.2 mag B-V ? B-V colour index
66- 69 F4.2 mag E(B-V) ? B-V colour excess
71- 74 F4.2 mag E2175 ? 2175A Bump strength measure
76- 80 I5 pc r ? Adopted distance
82- 86 I5 pc z ? Stellar distance above or below
the Galactic plane
89- 93 F5.2 [cm-2] log(N(HI)) Observed HI density column
95- 98 F4.2 [cm-2] e_log(N(HI)) rms uncertainty on log(N(HI))
100-105 F6.3 --- [c1] ? Stroemgren Balmer jump index corrected for
for extinction ([c1]=c1-0.2(b-y))
107-111 F5.2 [cm-2] log(N(HI))s ? Stellar HI density column
when [c1] available
113-117 F5.2 [cm-2] log(N(HI))i ? Interstellar HI density column corrected
for stellar absorption
119-120 I2 --- Ref Reference (1)
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 28-Jan-1997