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J/ApJS/123/639 UBV photometry of metal-weak candidates (Norris+, 1999)
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A search for stars of very low metal abundance. III.
UBV photometry of metal-weak candidates.
Norris J.E., Ryan S.G., Beers T.C.
<Astrophys. J. Suppl. Ser. 123, 639 (1999)>
=1999ApJS..123..639N
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ADC_Keywords: Photometry, UBV ; Stars, peculiar ; Stars, population II
Keywords: catalogs - stars: abundances - stars: Population II - surveys
Abstract:
We present photoelectric UBV photometry for some 2600 metal-poor dwarf
and giant candidates selected from the HK
objective-prism/interference-filter survey of Beers and colleagues.
These data provide the basis for our ultraviolet-excess selection of
objects having [Fe/H]{<~}-2.0 for a spectroscopic investigation in which
we have obtained ~1-2{AA} resolution spectra of some 1000 objects. The
present material may also prove useful for investigations of the
metal-poor dwarfs and giants more metal-rich than [Fe/H]=-2.0, as well
as the misclassified subdwarf O and B stars, white dwarfs, blue
metal-poor stars, and field horizontal-branch stars which appear in
the catalog.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 55 2086 UBV photometry for metal-weak candidates
table3.dat 55 549 Less accurate UBV photometry for fainter
metal-weak candidates
table4.dat 33 94 Multiple identifications in HK objective
prism survey (centered on H & K lines of Ca II)
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See also:
J/AJ/90/2089 : A search for stars of very low metal abundance I (Beers+ 1985)
J/AJ/103/1987 : Stars of very low metal abundance (Paper II) (Beers+ 1992)
Table 1 : External error estimates of photometric errors
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Comparison <D(V)> <D(B-V)> <D(U-B)> N_B,V_ N_U_
Source s[D(V)] s[D(B-V)] s[D(U-B)]
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Carney et al., 1994 -0.040 +0.030 +0.020 1 1
Cat. <J/AJ/107/2240> ... ... ...
Ryan, 1989 +0.001 +0.011 +0.000 7 6
Cat. <J/AJ/98/1693> 0.020 0.016 0.020
Other HK investigations -0.002 -0.013 +0.003 13 9
0.044 0.019 0.031
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Note: D: Differences in the sense (Other work - This work)
s: Dispersion of difference
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- BPS BPS star designation
13 A1 --- n_BPS [*] when identifications in file table4.dat
14- 15 I2 h RAh Right ascension (1950.0)
17- 18 I2 min RAm Right ascension (1950.0)
20- 23 F4.1 s RAS Right ascension (1950.0)
25 A1 --- DE- Declination sign (1950.0)
26- 27 I2 deg DEd Declination sign (1950.0)
29- 30 I2 arcmin DEm Declination (1950.0)
32- 33 I2 arcsec DEs Declination (1950.0)
35- 39 F5.2 mag Vmag V magnitude
41- 45 F5.2 mag B-V B-V colour index
47- 51 F5.2 mag U-B ? U-B colour index
53 I1 --- o_Vmag ? Number of V and B-V measures
54 I1 --- o_U-B Number of U-B determinations
55 A1 --- Note [*] *: Stars for which we have obtained
medium-resolution spectroscopy and which form
the basis of the work of Norris et al.
(1999, AJ, in prep.)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- BPS Identification from tables 2 and 3
14- 22 A9 ---- Star2 Identification from other fields (1)
24- 32 A9 --- Star3 Identification from other fields (1)
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Note (1): Not necessarily observed in this work
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History: From AAS Electronic Version
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(End) Patricia Bauer [CDS] 23-Mar-2000