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J/A+A/475/1053      Magnetic fields in Ap/Bp stars         (Auriere+, 2007)

Weak magnetic fields in Ap/Bp stars: Evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy. Auriere M., Wade G.A., Silvester J., Lignieres F., Bagnulo S., Bale K., Dintrans B., Donati J.F., Folsom C.P., Gruberbauer M., Hui Bon Hoa A., Jeffers S., Johnson N., Landstreet J.D., Lebre A., Lueftinger T., Marsden S., Mouillet D., Naseri S., Paletou F., Petit P., Power J., Rincon F., Strasser S., Toque N. <Astron. Astrophys. 475, 1053 (2007)> =2007A&A...475.1053A
ADC_Keywords: Stars, peculiar ; Magnetic fields Keywords: stars: chemically peculiar - stars: magnetic field Abstract: We have investigated a sample of 28 well-known spectroscopically-identified magnetic Ap/Bp stars, with weak, poorly-determined or previously undetected magnetic fields. The aim of this study is to explore the weak part of the magnetic field distribution of Ap/Bp stars. Using the MuSiCoS and NARVAL spectropolarimeters at Telescope Bernard Lyot (Observatoire du Pic du Midi, France) and the cross-correlation technique Least Squares Deconvolution (LSD), we have obtained 282 LSD Stokes $V$ signatures of our 28 sample stars, in order to detect the magnetic field and to infer its longitudinal component with high precision (median sigma=40G). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 50 28 Star positions table3.dat 67 282 Dates, magnetic field detection and longitudinal magnetic field measurements
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) Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [HD] 4- 9 I6 --- HD HD number 11- 12 I2 h RAh Simbad Hour of Right Ascension (J2000.0) 14- 15 I2 min RAm Simbad Minute of Right Ascension (J2000.0) 17- 18 I2 s RAs Simbad Second of Right Ascension (J2000.0) 20 A1 --- DE- Simbad Sign of the Declination (J2000.0) 21- 22 I2 deg DEd Simbad Degree of Declination (J2000.0) 24- 27 F4.1 arcmin DEm Simbad Arcminute of Declination (J2000.0) 29- 33 F5.3 mag Bmag Simbad B band magnitude 35- 39 F5.3 mag Vmag Simbad V band magnitude 41- 50 A10 --- SpType Simbad MK spectral type
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Name 14- 19 I6 --- HD HD number 22- 31 A10 "DD/MM/YYYY" Date Date 33- 42 F10.2 d JD Julian Date 44- 47 I4 --- S/N Signal to Noise ratio 49- 55 F7.3 --- chi2 chi2 value 57- 58 A2 --- Det Quality of detection (1) 60- 63 I4 10-4T Bl Longitudinal magnetic field (gauss) 65- 67 I3 10-4T e_Bl rms uncertainty on Bl
Note (1): Detection as follows: DD = Definitive Detection md = Marginal Detection nd = Non Detection
Acknowledgements: Michel Auriere,
(End) Michel Auriere [Obs. Midi Pyrenees], Patricia Vannier [CDS] 16-Oct-2007
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