J/A+AS/128/265 ubvy-beta photometry of CP2 stars (Masana+ 1998)
CP2 stars as viewed by the ubvy-beta system
Masana E., Jordi C., Maitzen H.M., Torra J.
<Astron. Astrophys. Suppl. Ser. 128, 265 (1998)>
=1998A&AS..128..265M 1998A&AS..128..265M
ADC_Keywords: Stars, peculiar ; Stars, early-type ; Photometry, uvby, beta
Keywords: stars: chemically peculiar - stars: fundamental parameters -
stars: early type
Abstract:
The aim of this work is to study the capacity of the uvby Hβ
system for detecting the chemically peculiar (CP) stars based on the
effect that peculiar features in the flux distribution have on all the
Stroemgren-Crawford indices. Our study focuses on the classical
magnetic peculiar stars (CP2), though Am star s (CP1) are also
included for comparison with cool CP2 stars. Satisfactory results were
obtained for hot CP2 stars: the definition of a new index p, which is
a linear combination of uvby Hβ colours, allowed us to separate
a high percentage of hot CP2 stars from normal stars. According to
this new index, 60 new CP2 candidates are proposed. The working sample
was extracted from The General Catalogue of Ap and Am stars by Renson
et al. (1991, Cat. III/162). Photometric observations to enlarge the
sample of CP2 stars with complete uvby Hβ photometry were
carried out. These observations are also reported in the present
paper. The new index p is also used to correct the reddening of early
CP2 stars computed as if they were normal stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 88 46 uvby-beta photometry for CP2 stars
table3.dat 42 162 Hβ photometry for CP2 stars
table7.dat 39 60 Early CP2 candidate stars
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See also:
III/162 : General Catalogue of Ap and Am stars (Renson+ 1991)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD Identification (HD number, Cat. III/135)
7 A1 --- m_HD Multiplicity index on HD
9- 14 I6 --- HIC ? Identification (HIC number, Cat. I/196)
15- 16 A2 --- m_HIC Multiplicity index on HIC
18- 28 A11 --- SpType Spectral type
31- 35 F5.3 mag (b-y) (b-y) colour index
37- 40 F4.3 mag e_(b-y) rms uncertainty (b-y)
42- 47 F6.3 mag Vmag V magnitude
49- 52 F4.3 mag e_Vmag rms uncertainty on Vmag
54- 57 F4.3 mag m1 m1 colour index
59- 62 F4.3 mag e_m1 rms uncertainty on m1
64- 68 F5.3 mag c1 c1 colour index
70- 73 F4.3 mag e_c1 rms uncertainty on c1
75 I1 --- o_uvby Number of measurements in uvby
77- 81 F5.3 mag Hbeta Hβ colour index
83- 86 F4.3 mag e_Hbeta rms uncertainty Hbeta
88 I1 --- o_Hbeta Number of measurements in Hβ
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD Identification (HD number, Cat. III/135)
7 A1 --- m_HD Multiplicity index on HD
9- 14 I6 --- HIC Identification (HIC number, Cat. I/196)
15- 17 A3 --- m_HIC Multiplicity index on HIC
19- 29 A11 --- SpType Spectral type
31- 35 F5.3 mag Hbeta Hβ colour index
37- 40 F4.3 mag e_Hbeta rms uncertainty on Hbeta
42 I1 --- o_Hbeta Number of measurements in Hβ
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Identification (1)
16- 26 A11 --- OtherName Alternative identification (1)
28- 34 A7 --- SpType Spectral type
36- 39 F4.2 mag DELTAp Delta p (peculiarity parameter)
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Note (1): references of the numeration for the cluster star in Table 7.
Mel 20: Heckmann O., et al., 1956MiHam..10...37H 1956MiHam..10...37H
1956, Mitt. Hamburg. Sternw. Bergedorf, no. 10
NGC 1893: Cuffey J., 1937AnHar.105..403C 1937AnHar.105..403C
NGC 2244: Ogura K., Ishida K., 1981PASJ...33..149O 1981PASJ...33..149O
NGC 2516: Cox A.N., 1955ApJ...121..628C 1955ApJ...121..628C
NGC 3293: Turner D.G., et al., 1980AJ.....85.1193T 1980AJ.....85.1193T
NGC 3766: Ahmed F., 1962PROE....3...57A 1962PROE....3...57A
NGC 6231: Seggewis W., 1968VeBon..79....1S 1968VeBon..79....1S
NGC 7039: Hassan S.M., 1973A&AS....9..261H 1973A&AS....9..261H
NGC 7243: Lengauer G.G., 1937, Izv. Glav. Astr. Obs. Pulkove 15, no. 126
=1937BOPul..15....3L 1937BOPul..15....3L
NGC 7654: Lundby A., 1946UppAn...1j...1L 1946UppAn...1j...1L
IC 4725: Johnson H.L., 1960ApJ...131..620J 1960ApJ...131..620J
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Acknowledgements: Eduard Masana
(End) Patricia Bauer [CDS] 24-Jul-1997