J/MNRAS/426/1003 Polarisation and magnetic fields in Ap stars (Silvester+, 2012)
Stokes IQUV magnetic Doppler imaging of Ap stars.
I. ESPaDOnS and NARVAL observations.
Silvester J., Wade G.A., Kochukhov O., Bagnulo S., Folsom C.P., Hanes D.
<Mon. Not. R. Astron. Soc., 426, 1003-1030 (2012)>
=2012MNRAS.426.1003S 2012MNRAS.426.1003S
ADC_Keywords: Stars, Ap ; Magnetic fields ; Polarization
Keywords: stars: chemically peculiar - stars: magnetic field
Abstract:
In this paper we describe and evaluate new spectral line polarization
observations obtained with the goal of mapping the surfaces of
magnetic Ap stars in great detail. One hundred complete or partial
Stokes IQUV sequences, corresponding to 297 individual polarized
spectra, have been obtained for seven bright Ap stars using the
Echelle SpectroPolarimetric Device for the Observation of Stars
(ESPaDOnS) and NARVAL high-resolution spectropolarimeters. The targets
span a range of masses from approximately 1.8 to 3.4M☉, a range
of rotation periods from 2.56 to 6.80d and a range of maximum
longitudinal magnetic field strengths from 0.3 to over 4kG. For three
of the seven stars, we have obtained dense phase coverage sampling the
entire rotational cycle.
Description:
In total 48 sequences were obtained with ESPaDOnS and 52 with NARVAL.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 74 7 Stars discussed in this paper
table4.dat 68 100 Longitudinal magnetic field and net linear
polarization measurements of magnetic A and B
stars, measured from LSD Stokes V profiles, and
Stokes Q and U profiles
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See also:
III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)
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 (G1)
8- 19 A12 --- Name Star name
21- 23 F3.1 mag Vmag V magnitude
25- 27 A3 --- SpType MK spectral type
29- 33 I5 K Teff Effective temperature
35- 38 F4.2 Msun Mass Mass
40- 41 I2 km/s vsini Projected rotational velocity
43 I1 km/s e_vsini rms uncertainty on vsini
45- 51 F7.5 d Prot Rotational period
53- 56 F4.2 Rsun Rad Radius
58- 60 I3 deg i Inclination
62- 63 I2 --- NBl Number of longitudinal field measurements
obtained
65- 66 I2 --- NQ Number of net linear polarization measurements
obtained
68- 69 I2 10-4T Bl.med Median longitudinal field uncertainty obtained
71- 74 F4.2 dT <Bl>rms Mean longitudinal field rms (kGauss)
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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- 6 I6 --- HD HD number (G1)
8- 15 F8.3 d JD Julian date (JD-2450000)
17- 21 F5.3 --- Phase Phase
23- 27 I5 10-4T Bl Longitudinal magnetic field (Gauss)
29- 30 I2 10-4T e_Bl rms uncertainty on Bl
32- 40 F9.6 --- Q/I ? Net linear polarization from Stokes Q profile
42- 49 F8.6 --- e_Q/I ? rms uncertainty on Q/I
51- 59 F9.6 --- U/I ? Net linear polarization from Stokes U profile
61- 68 F8.6 --- e_U/I ? rms uncertainty on U/I
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Global notes:
Note (G1): In original table4, HD 40132 is a misprint for HD 40312.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Apr-2013