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II/36 UBV and uvby-beta observations of Orion OB1 Association (Warren+ 1977)
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Catalogue of Individual UBV and uvby-beta Observations in the Region
of the Orion OB 1 Association.
Warren W. H. Jr., Hesser J. E.
<Astrophys. J. Suppl. 34, 115 (1977)>
=1977ApJS...34..115W
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ADC_Keywords: Photometry, UBV ; Photometry, uvby, beta ; Stars, OB
Description:
The Catalogue of Individual UBV and uvby-beta Observations of Stars in
the Region of the Orion OB 1 Association presents individual UBV
observations of 106 stars in the vicinity of the Orion Nebula (the
Sword region) and individual uvby-beta observations of 508 stars in
all regions of the Orion OB 1 association. For the UBV data the stars
are identified by their Brun (1935) numbers, with cross
identifications to the chart numbers used in Warren and Hesser (1977);
the uvby-beta stars are identified by the aforementioned chart numbers
and HD, BD or P (Parenago 1954) numbers in that order of preference.
The catalogue contains the data of all observations and is intended to
provide data for investigations of variability in the Orion region.
See <http://obswww.unige.ch/gcpd/ph01.html> for a full description of
the UBV system, and <http://obswww.unige.ch/gcpd/ph04.html> for a
description of uvby-beta system.
Objects:
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RA (2000) DE Name
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05 00 +00.9 Ori OB-1 Association
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See also:
II/171 : Parenago Catalogue of stars in the area of Ori Nebula
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ubv 42 357 UBV data
uvbybeta 70 1595 uvby-beta data
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Byte-by-byte Description of file: ubv
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Bytes Format Units Label Explanations
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1- 4 I4 --- Brun Number in the catalogue of Brun (1935)
6- 8 I3 --- WH ? Number assigned by Warren and Hesser (1977)
10-15 F6.3 mag Vmag *observed visual magnitude
16 A1 --- u_Vmag *[ :] certain nightly V are discordant
18-23 F6.3 mag B-V *observed B-V
24 A1 --- u_B-V [ :] if uncertain nightly B-V
26-31 F6.3 mag U-B *? observed U-B color
32-33 A2 --- u_U-B [ :] if uncertain nightly U-B; two colons
if nightly U-B very uncertain.
35-42 A8 "YY.MM.DD" DATE-UBV [0-9.]! Date of observation in form YY.MM.DD
(68.12.04 = 4 December 1968).
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Note on Vmag:
Byte 15 is used only when a night's observations averaged
to yield a 5 in the thousandths column.
Note on u_Vmag:
The following stars each have a single discordant value which careful
inspection of the original data fails to explain; while the existence of
these discrepancies may be indicative of variability, it is more likely
that they simply reflect an undetected error at the telescope; therefore,
they should not be used in forming means; Brun 37 (68.12.05) Brun 62
(68.12.06) Brun 202 (68.12.04) and Brun 244 (68.12.04).
Star Brun 490 appears variable in V, which Walker's (1969) data weakly
suggest too.
Note on B-V:
Byte 23 is used only when a night's observations averaged to yield a
5 in the thousandths column.
Note on U-B:
Byte 31 is used only when a night's observations averaged to yield
a 5 in the thousandths column.
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Byte-by-byte Description of file: uvbybeta
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Bytes Format Units Label Explanations
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1- 5 I5 --- WH Number assigned by Warren and Hesser (1977)
for purposes of chart identification.
6- 8 A3 --- m_WH Component identification for multiple systems
10-18 A9 --- Ident *Other identification
20-25 F6.3 mag Vmag ? V magnitude transformed from y.
27-32 F6.3 mag b-y ? b-y color index
34-39 F6.3 mag m1 ? m1 ((v-b) - (b-y)) color index
41-46 F6.3 mag c1 ? c1 ((u-v) - (v-b)) color index
48-55 A8 "YY.MM.DD" DATE-uvby [0-9.]? UT date of uvby observation
57-61 F5.3 mag beta ? beta index
63-70 A8 "YY.MM.DD" DATE-beta [0-9.]? UT date of beta observation
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Note on Ident:
The catalog identification
HD - Henry Draper Catalogue
BD - Bonner Durchmusterung
P - Parenago [1954] (Catalog <II/171>)
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Historical Notes:
* Record 859 in file ubvybeta has an erroneous value for the V
magnitude that needs to be resolved.
* Dates, originally written as MM.DDYY, were converted to YY.MM.DD
at CDS (February 1996) to allow meaningful time sorting
References:
Brun, A., 1935, Publ. Obs. Lyon 1, No. 12.
=1935POLyo...1...12B
Parenago. P. 1954, Trudy Sternberg Astron. Inst., No. 25.
=1954TrSht..25....1P
Walker, M. F. 1969, Astrophys. J. 155, 447.
=1969ApJ...155..447W
Warren, W. H. Jr. and Hesser, J. E. 1977, Astrophys. J. Suppl. 34, 115.
=1977ApJS...34..115W
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(End) C.-H. Joseph Lyu [Hughes STX/NASA] 30-March-1995