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J/A+A/450/763       Evolutionary state of magnetic CP stars  (Kochukhov+, 2006)

Evolutionary state of magnetic chemically peculiar stars. Kochukhov O., Bagnulo S. <Astron. Astrophys., 450, 763-775 (2006)> =2006A&A...450..763K
ADC_Keywords: Stars, peculiar ; Magnetic fields ; Stars, masses Keywords: stars: chemically peculiar - stars: evolution - stars: fundamental parameters - stars: magnetic fields Abstract: The photospheres of about 5-10% of the upper main sequence stars exhibit remarkable chemical anomalies. Many of these chemically peculiar (CP) stars have a global magnetic field, the origin of which is still a matter of debate. We present a comprehensive statistical investigation of the evolution of magnetic CP stars, aimed at providing constraints to the theories that deal with the origin of the magnetic field in these stars. Description: We have collected from the literature data for 150 magnetic CP stars with accurate Hipparcos parallaxes. We have retrieved from the ESO archive 142 FORS1 observations of circularly polarized spectra for 100 stars. From these spectra we have measured the mean longitudinal magnetic field, and discovered 48 new magnetic CP stars (five of which belonging to the rare class of rapidly oscillating Ap stars). We have determined effective temperature and luminosity, then mass and position in the H-R diagram for a final sample of 194 magnetic CP stars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 58 142 <Bz> measurements for the sample of CP stars observed with FORS1 (data retrieved from the ESO archive) table2.dat 93 194 Fundamental parameters of magnetic CP stars
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) III/162 : General Catalogue of Ap and Am stars (Renson+ 1991) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD (III/135) number 9- 14 I6 --- HIP ? HIP (I/239) number 17- 19 F3.1 mag Vmag V magnitude (1) 21- 33 A13 --- SpType MK spectral type (1) 35- 45 F11.3 d JD Julian date of the middle of the exposure 47- 51 I5 10-4T <Bz> Longitudinal magnetic field, in Gauss 53- 55 I3 10-4T e_<Bz> rms uncertainty on <Bz> 57- 58 A2 --- n_<Bz> [NCD ] Note for stars for which magnetic field was detected for the first time (2)
Note (1): V-magnitude and spectral type, most of which are extracted from the General catalogue of Ap and Am stars by Renson et al. (1991, Cat. III/162). Note (2): Note as follows: ND = new detection CD = confirmed detection
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD (III/135) number 8- 13 I6 --- HIP HIP (I/239) number 15- 17 I3 pc Dist Distance 19- 20 I2 pc e_Dist rms uncertainty on Dist 22- 26 F5.2 mag VMAG Absolute V magnitude 28- 31 F4.2 mag e_VMAG rms uncertainty on VMAG 33- 37 F5.3 [K] logTeff Effective temperature 39- 43 F5.3 [K] e_logTeff rms uncertainty on Teff 45- 48 F4.2 [solLum] logL Luminosity 50- 53 F4.2 [solLum] e_logL rms uncertainty on logL 55- 58 F4.2 solMass Mass Mass 60- 63 F4.2 solMass e_Mass rms uncertainty on Mass 65- 68 F4.2 [yr] logt Absolute stellar age 70- 73 F4.2 [yr] logtL Lower limit of 1sigma error interval on logt (1) 74 A1 --- --- [-] 75- 78 F4.2 [yr] logtU Upper limit of 1sigma error interval on logt (1) 80- 83 F4.2 --- tau Fractional stellar age 85- 88 F4.2 --- tauL Lower limit of 1sigma error interval on tau (1) 89 A1 --- --- [-] 90- 93 F4.2 --- tauU Upper limit of 1sigma error interval on tau (1)
Note (1): Error interval compatible with the errors of Teff and L.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Dec-2006
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