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II/114 UV Interstellar Extinction Excesses for 1415 Stars (Savage+ 1985)
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A Catalog of Ultraviolet Interstellar Extinction Excesses for 1415 Stars
Savage B.D., Massa D., Meade M.R., Wesselius P.R.
<Astrophys. J. Suppl. 59, 397 (1985)>
=1985ApJS...59..397S
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ADC_Keywords: Interstellar medium
Mission_Name: ANS
Description:
This catalog contains ultraviolet interstellar extinction excesses
in the ultraviolet region, as derived from five-channel Astronomical
Netherlands Satellite (ANS) UV photometry. The rectangular
bandpasses had central wavelengths of 1549, 1799, 2200, 2493, and
3294 angstroms with widths of 149, 149, 200, 150, and 101 angstroms,
respectively. Color excesses were derived for each UV BD
wavelength with reference to the V filter of the UBV system as well
as a measure of excess extinction in the 2200-angstrom bump. The
photometric data used were taken from the ANS Ultraviolet Photometry
Catalogue of Point Sources (Wesselius et al. 1982), and excesses
were derived for 1415 stars with spectral types of B7 and earlier.
Data in the catalog include: object identification in a uniform
format; right ascension and declination (1950); galactic coordinates
estimated distance based on MK type; V magnitude and spectral type
taken from the ANS catalog; color excesses E(B-V), E(33-V), E(25-V),
E(22-V), E(18-V), E(15-V); extinction parameter E(Bump); Delta
parameters for the bump: and (15-V) (measuring the deviation of the
extinction curve affecting a given star from the sample mean curve,
normalized by the rms scatter of the entire sample), and comment
codes for variability, cluster proximity, and duplicity. The UV
extinction measures are appended by uncertainty flags where
appropriate. Other data include identification of stars exhibiting
peculiar UV extinction, and basic positional, photoelectric and
spectral-type information.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 132 1415 catalog data
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Ident *Object identification
14- 15 I2 h RAh Right ascension, equinox 1950.
17- 18 I2 min RAm R.A. (minutes)
20- 21 I2 s RAs R.A. (sec)
23 A1 --- DE- Sign of declination, equinox 1950.
24- 25 I2 deg DEd Dec. (degrees)
27- 30 F4.1 arcmin DEm Dec. (minutes)
32- 36 F5.1 deg GLON Galactic longitude, l.
38- 42 F5.1 deg GLAT galactic latitude, b
44- 47 I4 pc dist Distance estimate based on Blaauw's
(1963) M(V) - spectral-type calibra-
tion and A(V) = 3.1E(B-V).
49- 53 F5.2 mag V V magnitude taken from ANS catalog.
56- 65 A10 --- Sp *Spectral type / luminosity
66- 70 F5.2 mag E(B-V) Color excess E(B-V).
73- 77 F5.2 mag E(33-V) Color excess E(33-V).
78 A1 --- flag1 *Extinction parameter flag
80- 84 F5.2 mag E(25-V) Color excess E(25-V).
85 A1 --- flag2 Flag for E(25-V).
87- 91 F5.2 mag E(22-V) Color excess E(22-V).
92 A1 --- flag3 Flag for E(22-V).
94- 98 F5.2 mag E(18-V) Color excess E(18-V).
99 A1 --- flag4 Flag for E(18-V).
101-105 F5.2 mag E(15-V) Color excess E(15-V).
106 A1 --- flag5 Flag for E(15-V).
109-113 F5.2 mag E(Bump) *Extinction parameter E(Bump)
114 A1 --- flag6 Extinction parameter flag for E(Bump),
present if its photometric error is >5%.
In the extreme case, a cataloged value of
E(Bump) can contain a cumulative photometric
error of 19%.
116-120 F5.2 mag Del(Bump) * ?=-9.99 Magnitude difference Delta(Bump)
121 A1 --- flag7 Magnitude difference Delta(Bump) parameter flag
A colon indicates that an E(x) with
photometric uncertainty >5% entered the
calculation of magnitude difference (x).
123-127 F5.2 mag Del(15-V) ?=-9.99 Magnitude difference Delta(15-V)
See the note on Delta(Bump)
128 A1 --- flag8 Magnitude difference Delta(15-V) parameter flag
(See byte 121.)
130-132 A3 --- code *Comment character codes
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Note on Ident:
Object identification- includes catalog name and number in The Henry
Draper Catalogue (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 on Sp:
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 on flag1:
Extinction parameter flag for E(33-V). A colon (:) indicates a parameter
derived from ANS data with 1 standard deviation statistical errors between
5% and 15%. This applies to the colon flags on all color excesses following
[but not to E(Bump)].
Note on E(Bump):
Extinction parameter E(Bump), the excess extinction in the bump measured
with respect to a linear (g-1) "background" extinction defined by
the ANS photometric bands at 1800 and 2500 A:
E(Bump) = E(22-V) - 0.35E(18-V) - 0.65E(25-V).
Note on Del(Bump):
Magnitude difference Del(Bump) represents the deviation of the extinction
curve affecting a given star from the sample mean curve, normalized by the
rms scatter of the entire sample. Magnitude difference (diff) values are not
given for stars having E(B-V) <= 0.1 mag, since parameters derived from stars
having small color excesses are much too unreliable. The default is -9.99.
Note on code:
Character codes denote 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.
E?: 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);
Remarks, Modifications, Acknowledgments and References:
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:
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 Dec. deg; minus signs were
removed from Dec. '; minus signs were missing from declinations in
the -00 deg zone. These stars were all looked up (+00 deg 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
magnitude difference (Bump) and to magnitude difference (15-V).
June 1995:
The catalog documentation was converted to standard form. Blanks in the
galactic lattitude field were converted to zero's to have valid values
with the sign included rather than a separate field for the sign.
References:
Blaauw, A. 1963, in Stars and Stellar Systems, Vol. 3, Basic Astronomical
Data, ed. K. Aa. 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 Catalogue,
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 deg to -40 deg (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 deg to -53 deg (Ann
Arbor; University of Michigan).
Jaschek, M. 1978, Catalogue of Selected Spectral Types in the MK System,
Bull. Inf. Cent. Donnees Stellaires No. 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 (Wesselius 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", A&AS, 49, 427
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(End) N.P.M. Kuin and C.-H. Joseph Lyu [Hughes STX/SSDOO/NASA] 9-Jun-1995