II/80 Homogeneous Photometry Bright Stars on DDO System (McClure+ 1981)
A Catalogue of Homogeneous Photometry of Bright Stars on the DDO System
McClure R.D., Forrester W.T.
<Publ. Dominion Astrophys. Obs. 15, 439 (No. 14) (1981)>
=1981PDAO...15...14M 1981PDAO...15...14M
ADC_Keywords: Photometry, DDO ; Stars, bright
Description:
The catalogue of homogeneous photometry of bright stars on the DDO
(System McClure and Forrester 1981) is a compilation of DDO photometry
of 2196 bright G and K stars prepared from observations made at Kitt
Peak National and Cerro Tololo Inter-American Observatories over the
last several years using filter sets well matched to the standard
system. The catalogue includes a large number of DDO stars whose data
have been taken directly from the standard-star paper of McClure
(1976AJ.....81..182M 1976AJ.....81..182M), plus a representative sample of stars selected
from the Catalogue of Bright Stars (Hoffleit 1964, see Cat. V/50) and
the Catalogue of High-Velocity Stars (Eggen 1964, see Cat. V/11) to
have good velocities, spectral types and freedom from companion
contamination.
The catalogue contains HD Catalogue numbers, DM identifications; and
the standard photometric indices of the DDO system. The number of
observations from which each index was determined is also given, along
with standard errors.
The DDO 6-filter has the following peak wavelengths and widths:
------------------------
Filter Peak Width
[nm] [nm]
------------------------
35 346.0 38.3
38 381.5 33.0
41 416.6 8.3
42 425.7 7.3
45 451.7 7.6
48 488.6 18.6
------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 80 2196 Catalog data
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See also:
II/164 : DDO Photoelectric Photometric Catalog (Mermilliod+ 1989)
GCPd/12 : DDO Photometry page at Lausanne
(http://obswww.unige.ch/gcpd/ph12.html)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD ? Henry Draper Catalogue (III/135) number
(blank for five stars not in the HD)
7 I1 --- m_HD ? HD Code (1=A component; 9 if HD and HD+1
included in observation; 0 otherwise)
8- 18 A11 --- DM *Durchmusterung catalog (DM) identification
20- 25 F6.3 mag m48 ? 48 filter magnitude m48
26- 27 I2 mmag e_m48 *? Standard error sigma/sqrt(N) of m48 (1)
28 A1 --- f_m48 [*] Asterisk if error in m48 > 0.099 magnitude
29- 34 F6.3 mag C(45-48) Color-index C(45-48)
35- 36 I2 mmag e_C(45-48) ? Standard error of C(45-48)
38- 43 F6.3 mag C(42-45) Color index C(42-45)
44- 45 I2 mmag e_C(42-45) ? Standard error of C(42-45).
47- 52 F6.3 mag C(41-42) Color index C(41-42)
53- 54 I2 mmag e_C(41-42) ? Standard error of C(41-42).
56- 61 F6.3 mag C(38-41) ? Color index C(38-41)
62- 63 I2 mmag e_C(38-41) ? Standard error of C(38-41).
64 A1 --- f_C(38-41) [* ]Asterisk if error in C(38-41) > 0.099
65- 70 F6.3 mag C(35-38) ? Color index C(35-38)
71- 72 I2 mmag e_C(35-38) ? Standard error of C(35-38). See bytes 25-26.
73 A1 --- f_C(35-38) [* ]Asterisk if error in C(35-38) > 0.099
74- 79 I6 --- Nobs *? Number of observations
80 A1 --- f_Nobs *[*S ] Note on Nobs
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Note on DM:
BD = Bonner Durchmusterung
CD = Cordoba Durchmusterung
CP = Cape Photographic Duchmusterung
The sign of the zone is in byte 10, the zone number in bytes 11-12,
and the number in the zone in bytes 13-17.
Note on e_m48:
blank = no mean error given because of only a single observation,
standard star, or error > 0.099
Note on Nobs:
Array of 6 digits giving numbers of observations, Nobs, contributing
to the magnitude and colors, respectively. Fields are all blanks for
standard stars where data are taken directly from McClure
(1976AJ.....81..182M 1976AJ.....81..182M), and in cases where all Nobs > 9 (see f_Nobs).
Note on f_Nobs:
* = Nobs is blank because number of observations is > 9
S = Standard star
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Remarks and Modifications:
The catalogue was received on magnetic tape from Dr. Robert D. McClure of
the Dominion Astrophysical Observatory on 5 January 1982. The following
modifications to the original format were made in order to make the data
easier to process by the general user while still retaining all
information and coding in the original data set:
1. All records were condensed by eliminating unused bytes between the data
fields in order to make room for the addition of Durchmusterung (DM)
numbers for the HD stars.
2. DM numbers were inserted into the records by retrieving them from an
updated and corrected version of the SAO-HD-DM-GC Cross Index
(Warren and Roman 1981) which had been sorted by HD number. Eleven
stars not in the cross index (non-SAO stars) were looked up manually
using the HD catalogue and inserted.
3. Multiple HD numbers, e.g. HD 110379/80 were replaced by the lower
number alone followed by a 9 to indicate that the data are for HD and
HD + 1, i.e. the standard codes adopted by the Centre de Donnees
Stellaires, Strasbourg, were added to all HD numbers (see description
for byte 7).
4. Asterisks in the standard error fields of m48, C(38-41) and C(35-38),
used to indicate errors > 0.099 mag, were moved to the flag bytes
27, 63 and 72 and those standard error fields were blanked out to
allow the fields to be read with real format specifications.
5. Asterisks in the numbers of observations (Nobs) fields were converted to
blanks and a single asterisk moved to byte 79 for the same reason as
above. Also, the abbreviation "STD" in the Nobs fields was changed to
blanks and the character "S" placed into byte 79 to flag standard stars.
6. Plus signs were added to all positive color-index data, always in the
byte immediately preceding each datum.
* 04-Dec-2002 (Francois Ochsenbein, CDS): DM number corrected for stars
HD 5457, 26967, 114710, 157244, 179957, 204075;
some cosmetic changes in ReadMe file.
References:
Eggen O.J. 1964-1965, "Catalogue of High Velocity Stars", Royal Obs. Bull.
No. 84 (1964RGOB...84..111E 1964RGOB...84..111E, Cat. V/11)
Hoffleit D. 1964, Catalogue of Bright Stars, 3rd Ed. (New Haven: Yale
University Observatory); see Cat. V/50
McClure R.D. 1976, Astron. J. 81, 182 (1976AJ.....81..182M 1976AJ.....81..182M)
McClure R.D., Forrester W.T. 1981, A Catalogue of Homogeneous Photometry
of Bright Stars on the DDO System, Publ. Dominion Astrophys. Observatory
15, 439 (No. 14) (1981PDAO...15...14M 1981PDAO...15...14M)
Warren W.H.Jr., Roman N.G. 1981, Bull. Amer. Astron. Soc. 13, 838
(1981BAAS...13..838W 1981BAAS...13..838W)
(End) M.C. Larkin [SSDOO/ADC] C.-H. Joseph Lyu [Hughes STX/NASA] 10-May-1995