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J/A+AS/107/403 Kappa Dra (Juza+, 1994)
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Correlated long-term light, colour and spectral variations of the Be star
Kappa Dra
Juza K., Harmanec P., Bozic H., Pavlovski K., Ziznovsky J.
Tarasov A.E., Horn J., Koubsky P.
<Astron. Astrophys. Suppl. Ser. 107, 403 (1994)>
=1994A&AS..107..403J (SIMBAD/NED Reference)
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ADC_Keywords: Stars, Be; Photometry, UBV; Equivalent widths; Balmer lines
Keywords: stars: emission-line, Be - stars: binaries: spectroscopic -
stars: variables: other
Abstract:
Intensity of the Balmer emission lines of {kappa} Dra, documented by
spectral records from the past 100 years, was found to vary with a period
of 8406d (23.01yr). Optical brightness and continuum polarimetry seem to
vary with the same period. Polarimetric changes are in phase with the
emission strength. The brightness of the object attains maximum during the
rise of emission. Then it declines to a local minimum which coincides with
the maximum strength of the Balmer emission. Possible qualitative
interpretation of these facts is briefly outlined.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 61 4 List of comparison and check stars
table2 50 8 Seasonal means of UBV observations of Kappa Dra
table3 52 112 Nightly means of UBV observations of Kappa Dra
table4 55 82 Published photometry of Kappa Dra
table5a 25 41 Equivalent width of H alpha
table5b 26 110 Strength of emission of H beta
table6a 20 26 Published equivalent width of H alpha
table6b 20 42 Published strength of emission of H beta
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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3- 6 I4 --- HR []? HR denomination
8- 13 I6 --- HD HD denomination
15- 21 A7 --- BD BD denomination
23- 34 A12 --- Rem Remarks
36- 40 F5.3 mag V V magnitude
42- 46 F5.3 mag B-V B-V colour
48- 52 F5.3 mag U-B U-B colour
54- 61 A8 --- Sp Spectral type
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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5- 12 F8.3 d Season Observation date
14- 16 I3 --- Nobs Number of individual observations in given
season
20- 24 F5.3 mag V V magnitude
26- 30 F5.3 mag B B magnitude
33- 37 F5.3 mag U U magnitude
40- 44 F5.3 mag B-V B-V colour
46- 50 F5.3 mag U-B U-B colour
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Byte-by-byte Description of file: table3 table4
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Mean heliocentric Julian date of observation
15- 16 I2 --- Nobs []? number of individual observations (table3)
20- 24 F5.3 mag V []? V magnitude
26- 30 F5.3 mag B []? B magnitude
33- 37 F5.3 mag U []? U magnitude
40- 45 F6.3 mag B-V []? B-V colour
47- 52 F6.3 mag U-B []? U-B colour
54- 55 A2 --- Ref References (table4) (1)
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Note (1): A: Mendoza E.E. 1958, ApJ 128, 207
B: Haeggkvist L. & Oja T. 1966, Ark. Astron. 4, 137
C: Johnson H.L. et al. 1966, Comm. Lun. Planet. Lab. 4, 99
D: Burki D.G. 1980, Geneva photometry of Be stars, priv. comm.
E: Papousek J. 1979, Scripta Fac. Sci. Nat. Univ. Purkynianae
Brunensis Phys. 9, 75
F: Dapergolas A. et al. 1981, Inf. Bull. Var. Stars No. 1920
G: Schuster W.J. & Alvarez M. 1983, PASP 95, 35
H: Johnson H.L. & Mitchell R.I. 1969, Comm. Lun. Planet. Lab. 8, 1
I: Gulliver A.F. 1983, priv. comm.
J: Alvarez M. & Schuster W.J. 1982, Rev. Mex. Astron.
Astrofis. 5, 173
K: Schuster W.J. & Guichard J. 1984, Rev. Mex. Astron.
Astrofis. 9, 141
L: Catalano S. & Umana G. 1987, Physics of the Be stars, IAU Colloq.
N0. 92, 101 and private communication
M: Haeggkvist L. 1971, A&A 12, 5
Symbols * and + attached to the authors code in the last column denote
original measurements in other photometric systems than UBV, and publication
of only mean values of individual measurements, respectively. No exact times
of observations were given in papers A, B, G, H and M.
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Byte-by-byte Description of file: table5a table6a
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Bytes Format Units Label Explanations
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2- 12 F11.3 d HJD Mean heliocentric Julian date of observation
14- 18 F5.2 --- EW Equivalent width of Halpha line
20- 21 A2 --- Source Source (see note (1) of table5b)
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Byte-by-byte Description of file: table5b table6b
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Mean heliocentric Julian date of observation
14- 18 F5.3 --- E/C Strength of Hbeta emission
20- 21 A2 --- Source Source (1)
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Note (1): O : photographic spectrograms from Ondrejov
OR: Reticon spectrograms from Ondrejov
R : photographic spectrograms from Rozen
CD: CCD spectrograms from Crimea
A : Underhill A.B. 1953, MNRAS 113, 477
B : Bahng J.D.R. 1976, Be and Shell Stars, IAU Symposium No. 70,
ed. A. Slettebak (D. Reidel, Dordrecht) 41
C : Lacy C.H. 1977, ApJ 212, 132
D : Slettebak A. & Reynolds R.C. 1978, ApJ 38, 205
E : Reynolds R.C. & Slettebak A. 1980, PASP 92, 472
F : Andrillat Y. & Fehrenbach C. 1981, Workshop On Pulsating Be Stars
eds. G.E.V.O.N. and C. Sterken (Nice Observatory Publ.) 255
G : Ghosh K.K. 1990, ApJS 72, 543
H : Curtiss R.H. 1932, Publ. Astron. Obs. Univ. Michigan 4,
No. 12, 163
I : Jessup M.K. 1932, ApJ 76, 75
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(End) Patricia Bauer [CDS] 18-Oct-1994