II/114 UV Interstellar Extinction (Savage+ 1985)
A Catalogue of UV Interstellar Extinction Excesses for 1415 stars
Savage B.D., Massa D., Meade M., Wesselius P.R.
<Astrophys. J. Suppl. 59, 397 (1985)>
=1985ApJS...59..397S 1985ApJS...59..397S (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Photometry, ultraviolet ; Extinction
Description:
The documentation is mostly adapted from the "Documentation for the
Machine-Readable Version of A catalog of Ultraviolet Interstellar
Extinction Excesses for 1415 Stars" by Wayne H. Warren Jr., May 1986,
National Space Science Data Center NSSDC/WDC-A-R&S 86-05
This document describes the machine-readable version of the catalog as
it is currently being distributed from the Astronomical Data Centers.
It is intended to enable users to read and process the data without
problems and guesswork, but it is not intended to replace the original
published paper, which users should study before processing the data.
The format described below is very similar to that given on page 431
of the source reference, but some modifications were made at the ADC
(with the consent of the authors) to effect uniformity.
Introduction:
"A Catalog of Ultraviolet Interstellar Extinction Excesses for 1415
Stars" contains interstellar extinction excesses in the ultraviolet
region derived from five-channel UV photometry carried out with the
ANS spacecraft. Filters centered at approximately 155, 180, 220, 250
and 330 nm were used for the observations and excesses were derived
for each UV wavelength with reference to the V magnitude of the UBV
system. The photometric data used to derive the UV excesses are taken
from the "ANS Ultraviolet Photometry Catalogue of Point Sources
(Wesselius et al. 1982), also available in machine-readable form from
the international network of astronomical data centers (catalog II/97;
Warren 1984). For additional information concerning the source data,
object selection, extinction parameters, and relations among the color
excesses themselves and with the excess extinction in the 220-nm bump,
the source reference should be consulted.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog 132 1415 Catalog of Extinction Parameters
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Byte-by-byte Description of file: catalog
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Object identification (1)
14- 15 I2 h RAh Right Ascension 1950 (hours)
17- 18 I2 min RAm Right Ascension 1950 (minutes)
20- 21 I2 s RAs Right Ascension 1950 (seconds)
23 A1 --- DE- Declination 1950 (sign)
24- 25 I2 deg DEd Declination 1950 (degrees)
27- 30 F4.1 arcmin DEm Declination 1950 (minutes)
32- 36 F5.1 deg GLON Galactic longitude
38- 42 F5.1 deg GLAT Galactic latitude
44- 47 I4 pc Dist Distance estimate (2)
49- 53 F5.2 mag Vmag V magnitude taken from ANS catalog.
56- 65 A10 --- Sp Spectral type (3)
66- 70 F5.2 mag E(B-V) Color excess.
73- 77 F5.2 mag E(33-V) Color excess from 330nm
78 A1 --- u_E(33-V) Extinction parameter flag for E(33-V) (4)
80- 84 F5.2 mag E(25-V) Color excess from 250nm
85 A1 --- u_E(25-V) Uncertainty flag for E(25-V) (4)
87- 91 F5.2 mag E(22-V) Color excess from 220nm
92 A1 --- u_E(22-V) Uncertainty flag for E(22-V) (4)
94- 98 F5.2 mag E(18-V) Color excess from 180nm
99 A1 --- u_E(18-V) Uncertainty flag for E(18-V) (4)
101-105 F5.2 mag E(15-V) Color excess from 150nm
106 A1 --- u_E(15-V) Uncertainty flag for E(15-V) (4)
109-113 F5.2 mag E(Bump) Extinction parameter E (Bump) (5)
114 A1 --- u_E(Bump) Extinction parameter flag for E(Bump) (6)
116-120 F5.2 --- D(Bump) [-6/4]?=-9.99 Deviation of the extinction (7)
121 A1 --- u_D(Bump) Uncertainty flag on D(Bump) (8)
123-127 F5.2 --- D(15-V) [-6/6]?=-9.99 Deviation of the extinction (7)
128 A1 --- u_D(15-V) Uncertainty flag on D(15-V) (8)
130-132 A3 --- Com [CDEV? ] Comments (9)
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Note (1): catalog name and number in the Henry Draper Catalogue (HD,
Cannon and Pickering 1918-1924; Cannon 1925-1936; Cannon and Walton
Mayall 1949), in one of the Durchmusterung catalogs, or in the catalog
of Feige (1958, 1959). The catalog identification is always in bytes
1-3 and the number in bytes 4-12, and the field is entirely
homogeneous so that the complete catalog can be sorted by object ID.
Note (2): Distance estimate based on Blaauw's (1963) Mv--spectral-type
calibration and Av = 3.1E(B-V).
Note (3): Spectral Type taken from the ANS catalog, wherein the original
sources are: Jaschek (1978), Houk and Cowley (1975), Houk (1978),
Buscombe (1977,1980), other sources, in the priority given; or from
the HD. The format is uniform with temperature classes in byte 56,
sub-classes in 57-59, and luminosity classes/peculiarities in 60-65.
Several incorrect spectral types in the ANS catalog have been
corrected here. Whereas the luminosities and peculiarities are all in
upper case in the published catalog, they have been converted to
upper/lower case in this machine version according to standard
notation.
Note (4): A colon (:) indicates a parameter derived from ANS data
with 1σ statistical errors between 5 and 15%. This applies
to the colon flags on all color excesses [but not to E(Bump)].
Note (5): E(Bump) is the excess extinction in the bump measured with
respect to a linear (λ-1) "background" extinction defined by
the ANS photometric bands at 180 and 250 nm:
E(Bump) = E(22-V) - 0.35E(18-V) - 0.65E(25-V).
Note (6): this flag is present if its photometric error is >5%. In the
extreme case, a catalogued value of E(Bump) can contain a cumulative
photometric error of 19%.
Note (7): D(x) measures the deviation of the extinction curve affecting
a given star from the sample mean curve, normalized by the rms scatter
of the entire sample. Deviations values are not given (value -9.99)
for stars having E(B-V) < 0.1mag, since parameters derived from stars
having small color excesses are much too unreliable.
Note (8): A colon indicates that an excess E(x) with photometric
uncertainty >5% entered the calculation of D(x).
Note (9): The character code denotes the following:
C : cluster star in crowded field, with possible UV data contamination;
D : star is listed in a source other than the "Strasbourg Catalog
of Stellar Identifications" (CSI; Ochsenbein, Bischoff and
Egret 1981) as double.
R?: possible anomalous extinction (reddening) law;
V : the UV results indicate variability;
V?: suspected variable (for some of these objects, the ground-based
information might be erroneously listed in the source catalogs);
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Historical Notes:
* May 1986 at Astronomical Data Center (ADC), GSFC:
A magnetic tape containing "A Catalog of Interstellar
Extinction Excesses for for 1415 Stars" was kindly supplied by
the authors on 24 June 1985, along with a preprint of the
published paper and a physical tape description. The entire
catalog was transferred to disk storage and compared against the
printed catalog. The following modifications were made to the
format in order to make it more uniform and compatible with other
machine-readable catalog formats:
1. The object identifications were homogenized and the catalog codes
(HD, BD, CD, FEI) added. These are now entirely uniform and all
numbers are right justified so that the whole catalog can be sorted
by object ID if desired.
2. Signs were added to positive values of declination; minus signs were
removed from declination arcminutes; minus signs were missing from
declinations in the -00deg zone. These stars were all looked up
(+00 and -00 deg) in other catalogs and appropriate signs added.
(This error does not occur in the published catalog.)
3. Signs were also added to positive values of galactic latitude,
to D(Bump) and to D(15-V).
* June 1995 at Centre de Donnees astronomiques Strasbourg (CDS):
Standardized the documentation, and replaced blanks by zeroes in
"GLAT" column.
Acknowledgments:
Appreciation is expressed to the authors for supplying the catalog
on magnetic tape and to M.R. Meade for correspondence regarding the
proposed changes. The authors also kindly reviewed a draft copy of
this document prior to its final printing for distribution with
magnetic tape copies of the catalog.
Related Data:
II/97 "ANS UV Photometry Catalogue of point sources"
References:
Blaauw, A. 1963, in "Stars and Stellar Systems", Vol. 3,
"Basic Astronomical Data", ed. K.A. Strand (Chicago: University of
Chicago Press), p. 383.
Buscombe, W. 1977, "MK Spectral Classifications, Third General
Catalogue" (Evanston, Illinois, USA).
Buscombe, W. 1980, "MK Spectral Classifications, Fourth General
Catalogue" (Evanston, Illinois, USA).
Cannon, A.J. 1925-1936, "The Henry Draper Extension", Ann. Astron.
Obs. Harvard College 100.
Cannon, A.J. and Pickering, E.C. 1918-1924, "The Henry Draper
Catatogue", Ann. Astron. Obs. Harvard College 91-99.
Cannon, A.J. and Walton Mayall, M. 1949, "The Henry Draper
Extension, The Annie J. Cannon Memorial Volume", Ann. Astron.
Obs. Harvard College 112.
Feige, J. 1958, Astrophys. J. 128, 267.
Feige, J. 1959, Astrophys. J. 129, 600.
Houk, N. 1978, "Michigan Catalogue of 2-Dimensional Spectral Types for
the HD Stars", Vol.2, Zones -52 to -40deg (Ann Arbor: University of
Michigan).
Houk, N. and Cowley, A.P. 1975, "Michigan Catalogue of 2-Dimensional
Spectral Types for the HD Stars", Vol.1, Zones -89 to -53deg
(Ann Arbor: University of Michigan).
Jaschek, M. 1978, "Catalogue of Selected Spectral Types in the MK
System", Bull. Inf. Cent. Donnees Stellaires 15, p.121.
Ochsenbein, F., Bischoff, M. and Egret, D. 1981, Astron. Astrophys.
Suppl. 43, 259.
Savage, B.D., Massa, D., Meade, M.R. and Wesselius, P.R. 1985,
Astrophys. J. Suppl. 59, 397.
Warren, W.H.Jr. 1984, "Documentation for the Machine-Readable Version
of the ANS Ultraviolet Photometry Catalogue of Point Sources"
(Wesseltus et al. 1982) NSSDC/WDC-A-R&S 84-10.
Wesselius, P.R., van Duinen, R.J., de Jonge, A.R.W., Aalders, J.W.G.,
Luinge, W. and Wildeman, K.J. 1982, "ANS uLtraviolet photometry,
catalogue of point sources", Astron. Astrophys. Suppl. 49, 427.
(Catalog II/97)
(End) Francois Ochsenbein [CDS] 21-Jun-1995