J/AN/324/219 Extinction of OB stars (Wegner, 2003)
The total-to-selective extinction ratio determined from near IR photometry
of OB stars
Wegner W.
<Astron. Nachrichten, 324, 219 (2003)>
=2003AN....324..219W 2003AN....324..219W
ADC_Keywords: Stars, early-type ; Photometry ; Extinction
Keywords: infrared radiation - stars: early-type -
stars: fundamental parameters (total-to-selective extinction ratios)
Abstract:
The paper presents an extensive list of the total to selective
extinction ratios R calculated from the infrared magnitudes of
597 O and B stars using the extrapolation method. The IR magnitudes of
these stars were taken from the literature. The IR colour excesses are
determined with the aid of "artificial standards", Wegner
(1994MNRAS.270..229W 1994MNRAS.270..229W). The individual and mean values of total to
selective extinction ratios R differ in most cases from the average
value R=3.10±0.05, Wegner (1993AcA....43..209W 1993AcA....43..209W) in different OB
associations. The relation between total to selective extinction
ratios R determined in this paper and those calculated using the
"method of variable extinction" and the Cardelli et al.
(1989ApJ...345..245C 1989ApJ...345..245C) formulae is discussed. The R values presented in
this paper can be used to determine individual absolute magnitudes of
reddened OB stars with known trigonometric parallaxes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 597 Total-to-selective extinction ratios R and absolute
magnitudes MV with their errors
refs.dat 87 186 References (table 4 in paper)
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See also:
II/62 : Catalogue of Extinction Data (Neckel+, 1980)
J/BaltA/11/1 : Interstellar extinction curves of OB stars (Wegner 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name (1)
12- 16 F5.2 mag Vmag V magnitude
18- 27 A10 --- SpType MK spectral type
30- 34 F5.3 mag E(B-V) Extinction in B-V
36- 39 F4.2 --- R Total-to-selective extinction ratio,
R=A(V)/E(B-V)
42- 45 F4.2 --- e_R rms uncertainty on R
47- 50 F4.1 mag VMAG ? Absolute V magnitude
53- 55 F3.1 mag e_VMAG ? rms uncertainty on Vmag
56 A1 --- u_VMAG Uncertainty flag on Vmag (no rms uncertainty)
58- 63 A6 --- Rem Remarks
66- 68 I3 --- r_E(B-V) References for UBV data, in refs.dat file
69 A1 --- --- [,]
70- 72 A3 --- r_SpType References for SpType, in refs.dat file
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Note (1): Nomenclature note:
P NNNN identified as Parenago NNNN in Simbad
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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- 3 A3 --- Ref Reference number
5- 23 A19 --- BibCode BibCode
25- 49 A25 --- Aut Author's name
51- 87 A37 --- Com Comments
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History:
Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 18-Sep-2003