J/A+A/652/A31 Stellar magnetic rotational phase curves. II (Bychkov+, 2021)
Catalog of averaged magnetic phase curves of stars. Second edition.
Bychkov V.D., Bychkova L.V., Madej J.
<Astron. Astrophys. 652, A31 (2021)>
=2021A&A...652A..31B 2021A&A...652A..31B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, dwarfs ; Magnetic fields
Keywords: stars: magnetic fields - stars: rotation -
stars: fundamental parameters
Abstract:
Some stars show periodic variability of the longitudinal (effective)
global magnetic field Be mainly due to rotation. We present the
second version of the catalog of average magnetic phase curves, which
are functions of Be versus the rotational phase phi, tables of their
parameters. The curves were obtained from literary data and as the
result of observations from SAO RAS telescopes. A total of 357 stars
of various spectral types were studied, data on which was published
before the end of August 2020. Magnetic Ap and Bp stars make up the
most numerous a subset in the catalog (224 objects).
Phase curves were obtained by least squares fit of a simple sine wave
or a double sine wave to the available B_e measurements. For some
stars we also improved or determined periods of their rotation. Phase
curves also are presented in 514 figures.
In some cases several phase curves presented here correspond to the
same star. This occurred when different observational techniques
produced significantly different series of Be values for that star.
In a few cases the rotational phase curves of the surface field, Bs,
are given for stars where longitudinal magnetic field data were not
available.
Description:
In this work, we present and analyse the results of longitudinal MF
measurements, Be, and data on the surface field, Bs, for 357 stars.
The data were obtained from various bibliographic sources and
originally were measured using both old photographic plates and the
newest high-resolution spectrographs. We appended data compiled from
personal communications, as well as our own determinations obtained at
the Special Astrophysical Observatory (Russian Academy of Sciences)
and magnetic measurements of stars in the Orion OB1 Association
(Borra, 1981ApJ...249L..39B 1981ApJ...249L..39B) by permission of Dr. E.F. Borra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 107 358 List of stars in the catalog
tablea2.dat 114 349 Stars with single wave phase curves:
parameters of phase curves
tablea3.dat 125 349 Stars with single wave phase curves:
parameters of the magnetic dipole
tablea4.dat 92 172 Stars with double wave phase curves: part 1
tablea5.dat 132 172 Stars with double wave phase curves: part 2
tablea6.dat 28 68 Measurements for 13 stars in Orion OB1 by
EF Borra (unpublished)
refs.dat 93 337 References
tableb.dat 109 1692 Comments on individual stars
curves/* . 515 Magnetic rotational phase curves files in fits
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See also:
J/A+AS/123/353 : Mean magnetic field modulus of Ap stars (Mathys, 1997)
J/A+A/407/631 : Catalogue of stellar effective magnetic fields (Bychkov+ 2003)
J/A+A/430/1143 : Stellar magnetic rotational phase curves (Bychkov+, 2005)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD ? HD number
8- 18 A11 --- Name1 HR/HIP/BD/CD/PPM number
20- 32 A13 --- Name2 Other name of the star
34- 52 A19 --- SpType MK spectral type
54- 88 A35 --- Remarks Commentaries
90- 95 F6.3 mag Vmag ? Visual luminosity
97-107 A11 --- Name HD number or other designation of the star
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name HD number or other designation of the star
13- 14 I2 --- Nmpc ? Number of the magnetic phase curve
16- 23 F8.2 10-4T B0 Average magnetic field (Gauss)
25- 29 F5.1 10-4T e_B0 rms uncertainty on B0 (Gauss)
31- 38 F8.2 10-4T B1 Half of the amplitude (Gauss) (G1)
40- 44 F5.1 10-4T e_B1 rms uncertainty on B1 (Gauss)
46- 57 F12.6 d P Period
59- 71 F13.7 d e_P rms uncertainty on the period
73- 77 A5 --- Notes Source of the period (G2)
79- 87 F9.3 d T0 Julian Day of zero phase, JD-2400000
89- 95 F7.3 d e_T0 rms uncertainty on T0
97-114 A18 --- FileName Name of the fits magnetic rotational phase
curve file in subdirectory curves
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name HD number or other designation of the star and
13- 14 I2 --- Nmpc ? Number of the magnetic phase curve
16- 18 I3 --- N Number of individual points
20- 24 F5.1 10-4T sigma Average scatter of Be_i observations around
the fitting curve
26- 30 F5.3 --- r r parameter of the dipole magnetic field (1)
32- 35 F4.3 --- e_r rms uncertainty on r
37- 39 I3 --- NV NV = N-3 (for sine wave fits)
41- 47 F7.2 --- chi2 chi2 value for one degree of freedom
49- 66 A18 --- Met Notes/Method (G3)
68-125 A58 --- Ref References, in refs.dat file
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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: tablea4.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name HD number or other designation of the star and
13- 14 I2 --- Nmpc ? Number of the magnetic phase curve
16- 23 F8.2 10-4T B0 Average magnetic field (Gauss)
25- 30 F6.2 10-4T e_B0 rms uncertainty on B0 (Gauss)
32- 39 F8.2 10-4T B1 Half of the amplitude B1 (Gauss) (G1)
41- 46 F6.2 10-4T e_B1 rms uncertainty on B1 (Gauss)
48- 55 F8.2 10-4T B2 B2 coefficient (Gauss)
57- 63 F7.2 10-4T e_B2 rms uncertainty on B2 (Gauss)
65- 73 F9.3 d T0 Julian Day of zero phase (JD-2400000)
75- 92 A18 --- FileName Name of the fits magnetic rotational phase
curve file in subdirectory curves
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Byte-by-byte Description of file: tablea5.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name HD number or other designation of the star and
13- 14 I2 --- Nmpc ? Number of the magnetic phase curve
16- 28 F13.7 d P Period
30- 40 F11.7 d e_P rms uncertainty on the period
42- 46 A5 --- Notes source of the period (G2)
48- 52 F5.4 --- z1 Phase shift z1
54- 58 F5.4 --- e_z1 rms uncertainty on z1
60- 64 F5.4 --- z2 Phase shift z2
66- 70 F5.4 --- e_z2 rms uncertainty on z2
72- 74 I3 --- NV NV = N-5
76- 81 F6.2 --- chi2 chi2 value
83- 96 A14 --- Met Method of Be measurements (G3)
98-132 A35 --- Ref References, in refs.dat file
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Byte-by-byte Description of file: tablea6.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Star HD number
9- 16 F8.3 d Time time of observation (JD-2440000)
18- 23 F6.0 G Be Longitudinal magnetic field strength
25- 28 F4.0 G e_Be rms uncertainty on Be (Gauss)
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Note (G1): We determined the best fit for the relation of B_e vs. phase,
Bei(phi)=B0+B1*cos(phi) single wave MPC
or
Bei(phi)=B0+B1*cos(phi+z1)+B2*cos(2*phi+z2) double wave MPC
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.
Note (G2): Remarks on the period as follows:
P = the period taken from references
*P = the period is close to that taken from references
**P = the period was determined by us
var.P = variable period
Note (G3): Method as follows:
Met = Be from metal lines
Hl = Be from hydrogen lines
all = both previous methods
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref Reference number
5- 23 A19 --- BibCode BibCode
25- 57 A33 -- Aut Author's name
59- 93 A35 --- Com Comments
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Byte-by-byte Description of file: tableb.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name HD number or other designation of the star
13- 14 I2 --- Nmpc ? Number of the magnetic phase curve
16-109 A94 --- Note Text of the note
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Acknowledgements:
Jurek Madej, jm(at)astrouw.edu.pl
(End) Patricia Vannier [CDS] 31-Jul-2021