J/A+A/430/1143 Stellar magnetic rotational phase curves (Bychkov+, 2005)
A catalog of stellar magnetic rotational phase curves.
Bychkov V.D., Bychkova L.V., Madej J.
<Astron. Astrophys., 430, 1143-1154 (2005)>
=2005A&A...430.1143B 2005A&A...430.1143B
ADC_Keywords: Stars, dwarfs ; Magnetic fields
Keywords: catalogs - stars: fundamental parameters - stars: magnetic fields -
stars: rotation
Abstract:
Magnetized stars usually exhibit periodic variations of the effective
(longitudinal) magnetic field Be caused by their rotation. We
present a catalog of magnetic rotational phase curves, Be vs. the
rotational phase phi, and tables of their parameters for 136 stars on
the main sequence and above it. Phase curves were obtained by the
least squares fitting of sine wave or double wave functions to the
available Be measurements, which were compiled from the existing
literature. Most of the catalogued objects are chemically peculiar A
and B type stars (127 stars). For some stars we also improved or
determined periods of their rotation. We discuss the distribution of
parameters describing magnetic rotational phase curves in our sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 157 Single wave Be phase curve parameters for
all catalogued stars
table2.dat 83 57 Parameter r of the dipole magnetic field.
table3.dat 104 22 Double wave Be variations
table4.dat 142 141 References
table5.dat 111 134 Periods of magnetic stars
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See also:
III/162 : General Catalogue of Ap and Am stars (Renson+ 1991)
J/A+A/407/631 : Catalogue of stellar effective magnetic fields (Bychkov+ 2003)
J/A+AS/123/353 : Mean magnetic field modulus of Ap stars (Mathys, 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number
7 A1 --- n_HD [*] Note on HD (G1)
10- 17 A8 --- SpType MK spectral type
19- 23 I5 10-4T B0 Average magnetic field, in Gauss (2)
25- 27 I3 10-4T e_B0 rms uncertainty on B0, in Gauss
29- 32 I4 10-4T B1 Half of the amplitude, in Gauss (2)
34- 37 I4 10-4T e_B1 rms uncertainty on B1, in Gauss
39- 50 F12.6 d Per Period (2)
52- 60 F9.3 d T0 Julian day of zero phase (JD=T0+2400000) (2)
62- 67 F6.3 d e_T0 rms uncertainty on T0
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Note (2): For all stars with an adequate number of Be determinations,
and for which the period of magnetic variability Pmag was known, we
have determined the best fit for the relation of Be vs. phase,
Bei(phi)=B0+B1cos(phi),
where phi=2*pi[(Ti-T0)/P], by the least squares method. Here B0 is the
average field, B1 stands for half of the amplitude, Ti is time of
measurement, P denotes the period, and T0 is the zero epoch, i.e. time
corresponding to the zero phase phi. We have chosen the zero epoch T0
in such a way that the phase phi=0 corresponds to the minimum of the
best fit magnetic curve.
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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 HD number
7 A1 --- n_HD [*] Note on HD (G1)
9- 11 I3 --- N Number of individual points
13- 15 I3 --- sigma Average scatter of Bei observation around
the fitting curve
17- 23 F7.3 --- r r parameter of the dipole magnetic field (1)
25- 29 F5.3 --- e_r ?=- rms uncertainty on r
31- 33 I3 --- NV NV = N-3 (for sine wave fits)
35- 40 F6.2 --- chi2 chi2 value for one degree of freedom
42- 44 A3 --- Met Method used (G2)
47- 83 A37 --- Ref Reference of measurement, in table4.dat
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Note (1): the parameter r relates both the angle β between the
magnetic dipole axis and the rotational axis, and the angle i
between rotational axis and the line of sight:
r = cos(β+i)/cos(β-i) = Be(min)/Be(max)
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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 HD number
8- 12 I5 10-4T B0 Average magnetic field (Gauss)
14- 16 I3 10-4T e_B0 rms uncertainty on B0 (Gauss)
18- 21 I4 10-4T B1 Half of the amplitude (Gauss)
23- 26 I4 10-4T e_B1 rms uncertainty on B1 (Gauss)
28- 31 I4 10-4T B2 B2 coefficient (Gauss)
33- 36 I4 10-4T e_B2 rms uncertainty on Be (Gauss)
38- 42 F5.3 --- z1 Phase shift z1
44- 48 F5.3 --- e_z1 rms uncertainty on z1
50- 54 F5.3 --- z2 Phase shift z2
56- 60 F5.3 --- e_z2 rms uncertainty on z2
62- 64 I3 --- NV NV = N-5
66- 70 F5.2 --- chi2 chi2 value
72- 74 A3 --- Met Method used (G2)
76-104 A29 --- Ref References, in table4.dat
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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- 3 I3 --- Ref Reference code
5- 23 A19 --- BibCode BibCode
25- 48 A24 --- Aut Author's name
50-142 A93 --- Com Comments
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number
7 A1 --- n_HD [*] Note on HD (G1)
9- 20 F12.6 d Per Period
25-111 A87 --- Ref Reference
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Global notes:
Note (G1):
The asterisk (*) indicates that the phase curve has to be fitted
by a double wave, and the star is also listed in Table 3.
Note (G2): Method as follows:
Met = Be from metal lines
Hl = Be from hydrogen lines
all = both previous methods
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 30-Jun-2006