2010A&A...523A..40A


Query : 2010A&A...523A..40A

2010A&A...523A..40A - Astronomy and Astrophysics, volume 523, A40-40 (2010/11-2)

No detection of large-scale magnetic fields at the surfaces of Am and HgMn stars.

AURIERE M., WADE G.A., LIGNIERES F., HUI-BON-HOA A., LANDSTREET J.D., ILIEV I.K., DONATI J.-F., PETIT P., ROUDIER T. and THEADO S.

Abstract (from CDS):

We investigate the magnetic dichotomy between Ap/Bp and other A-type stars by carrying out a deep spectropolarimetric study of Am and HgMn stars. Using the NARVAL spectropolarimeter at the Telescope Bernard Lyot (Observatoire du Pic du Midi, France), we obtained high-resolution circular polarisation spectroscopy of 12 Am stars and 3 HgMn stars. Using least squares deconvolution (LSD), no magnetic field is detected in any of the 15 observed stars. Uncertaintiies as low as 0.3G (respectively 1G) have been reached for surface-averaged longitudinal magnetic field measurements for Am (respectively HgMn) stars. Associated with the results obtained previously for Ap/Bp stars, our study confirms the existence of a magnetic dichotomy among A-type stars. Our data demonstrate that there is at least one order of magnitude difference in field strength between Zeeman detected stars (Ap/Bp stars) and non Zeeman detected stars (Am and HgMn stars). This result confirms that the spectroscopically-defined Ap/Bp stars are the only A-type stars harbouring detectable large-scale surface magnetic fields.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: magnetic field - stars: peculiar - stars: early-type

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * alf And a2* 00 08 23.25988 +29 05 25.5520 1.48 1.95 2.06 2.09 2.19 B8IV-VHgMn 455 0
2 V* HN And a2* 01 24 18.6765786624 +43 08 31.629475248   6.704 6.676     A4VpSrSi 138 0
3 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A0mA1Va 1468 0
4 * alf Gem A SB* 07 34 35.862828 +31 53 17.79429     1.9     A1.5IV+ 383 0
5 * alf Gem ** 07 34 35.87319 +31 53 17.8160 1.64 1.62 1.58 1.51 1.52 A1V+A2Vm 245 0
6 * alf Gem B SB* 07 34 36.100452 +31 53 18.57117     3.0     kA0hA2:mA1IVs 287 1
7 V* YY Gem BY* 07 34 37.4474327544 +31 52 10.179641496 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 840 0
8 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1075 1
9 * rho Pup dS* 08 07 32.6488235 -24 18 15.567946 3.43 3.24 2.81 2.46 2.25 F5IIkF2IImF5II 288 0
10 * kap Cnc a2* 09 07 44.8095541176 +10 40 05.519586828 4.70 5.13 5.24     B8IIImnp 356 0
11 * f UMa PM* 09 08 52.2576325 +51 36 16.732968 4.87 4.75 4.48 4.21 4.10 kA3VmF5IIISr 148 0
12 * tau UMa SB* 09 10 55.0419835680 +63 30 49.216366332   5.008 4.640     kA5hF0mF5II 224 1
13 * lam UMa PM* 10 17 05.7792565752 +42 54 51.889698684 3.54 3.48 3.45 3.37 3.38 A1IV 182 0
14 * bet UMa PM* 11 01 50.4765370 +56 22 56.733912 2.35 2.35 2.37 2.31 2.35 A1IVps 424 1
15 * tet Leo PM* 11 14 14.4044630 +15 25 46.454086 3.40 3.33 3.35 3.32 3.34 A2IV 323 0
16 * d02 Vir dS* 12 45 37.0584841 +07 40 23.969587   5.525 5.207     F0IIIm 153 0
17 * lam Vir SB* 14 19 06.5923499 -13 22 15.945905 4.750 4.660 4.520   4.43 A1V 144 0
18 * f Boo PM* 14 26 27.3650870400 +19 13 36.838844688   5.637 5.394     kA7hA8mF2(III)((Sr)) 115 0
19 HD 141675 * 15 47 37.9269361488 +55 22 35.852118600   6.122 5.878     A3m 69 1
20 * eps Ser PM* 15 50 48.9662218 +04 28 39.831153   3.844 3.693     kA2hA5mA7V 187 0
21 * iot CrB SB* 16 01 26.5649192496 +29 51 03.819408336   4.921 4.971     A0IIIspHgMnEu 260 0
22 * phi Her a2* 16 08 46.1762180496 +44 56 05.661355344 3.92 4.20 4.27 4.27 4.36 B9VspHgMn 288 1
23 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2591 0

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2022.05.24-11:55:38

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