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


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET20:16:57

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 - 2020
#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 442 0
2 V* HN And a2* 01 24 18.6762637253 +43 08 31.629302597   6.704 6.676     A4VpSrSi 131 0
3 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A1V+DA 1383 0
4 * alf Gem A SB* 07 34 35.863 +31 53 17.79     1.9     A1.5IV+ 380 0
5 * alf Gem ** 07 34 35.87319 +31 53 17.8160 1.63 1.62 1.58 1.51 1.52 A1V+A2Vm 235 0
6 * alf Gem B SB* 07 34 36.100 +31 53 18.57     3.0     kA0hA2:mA1IVs 285 1
7 * alf Gem C BY* 07 34 37.4475372002 +31 52 10.181030942 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 814 0
8 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1042 1
9 * rho Pup dS* 08 07 32.6488235 -24 18 15.567946 3.43 3.24 2.81 2.46 2.25 F5IIkF2IImF5II 273 0
10 * kap Cnc a2* 09 07 44.8101438776 +10 40 05.527005225 4.70 5.13 5.24     B8IIImnp 351 0
11 * f UMa PM* 09 08 52.2576325 +51 36 16.732968 4.87 4.75 4.48 4.21 4.10 kA3VmF5IIISr 141 0
12 * tau UMa SB* 09 10 55.0404694887 +63 30 49.064336279   5.008 4.640     kA5hF0mF5II 213 1
13 * lam UMa PM* 10 17 05.7736525022 +42 54 51.766171028 3.54 3.48 3.45 3.37 3.38 A1IV 174 0
14 * bet UMa PM* 11 01 50.4765370 +56 22 56.733912 2.35 2.35 2.37 2.31 2.35 A1IVps 402 1
15 * tet Leo PM* 11 14 14.4044630 +15 25 46.454086 3.40 3.33 3.35 3.32 3.34 A2IV 306 0
16 * d02 Vir dS* 12 45 37.0584841 +07 40 23.969587   5.525 5.207     F0IIIm 149 0
17 * lam Vir SB* 14 19 06.5923499 -13 22 15.945905 4.750 4.660 4.520   4.43 A1V 139 0
18 * f Boo PM* 14 26 27.3652900638 +19 13 36.847005483   5.637 5.394     kA7hA8mF2(III)((Sr)) 108 0
19 HD 141675 * 15 47 37.9271599127 +55 22 35.855194523   6.122 5.878     A3m 67 1
20 * eps Ser PM* 15 50 48.9662218 +04 28 39.831153   3.844 3.693     kA2hA5mA7V 180 0
21 * iot CrB SB* 16 01 26.5649794279 +29 51 03.813505647   4.921 4.971     A0IIIspHgMnEu 253 0
22 * phi Her a2* 16 08 46.1668803916 +44 56 05.732213070 3.92 4.20 4.27 4.27 4.36 B9VspHgMn 281 1
23 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2486 0

    Equat.    Gal    SGal    Ecl

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2020.02.17-20:16:57

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