2009A&A...498..543K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET14:19:37

2009A&A...498..543K - Astronomy and Astrophysics, volume 498, 543-550 (2009/5-1)

Observational constraints on the magnetic field of RR Lyrae stars.

KOLENBERG K. and BAGNULO S.

Abstract (from CDS):

A high percentage of the astrophysically important RR Lyrae stars show a periodic amplitude and/or phase modulation of their pulsation cycles. More than a century after its discovery, this ``Blazhko effect'' still lacks acceptable theoretical understanding. In one of the plausible models for explaining the phenomenon, the modulation is caused by the effects of a magnetic field. So far, the available observational data have not allowed us to either support nor rule out the presence of a magnetic field in RR Lyrae stars. We intend to determine whether RR Lyrae stars are generally characterized by the presence of a magnetic field organized on a large scale. With the help of the FORS1 instrument at the ESO VLT we performed a spectropolarimetric survey of 17 relatively bright southern RR Lyrae stars, both Blazhko stars and non-modulated stars, and determined their mean longitudinal magnetic field with a typical error bar <30G. All our measurements of the mean longitudinal magnetic field resulted in null detections within 3σ. From our data we can set an upper limit for the strength of the dipole component of the magnetic fields of RR Lyrae stars to ∼130G. Because of the limitations intrinsic to the diagnostic technique, we cannot exclude the presence of higher order multipolar components. The outcome of this survey clarifies that the Blazhko modulation in the pulsation of RR Lyrae stars is not correlated with the presence of a strong, quasi-dipolar magnetic field.

Abstract Copyright:

Journal keyword(s): stars: variables: RR Lyr - stars: magnetic fields - techniques: polarimetric - techniques: spectroscopic - stars: oscillations - stars: horizontal-branch

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* RU Scl RR* 00 02 48.1071341236 -24 56 43.077092861   10.991 10.563 10.24 10.069 F0/2V 79 0
2 V* RX Cet RR* 00 33 38.2803060389 -15 29 14.804076872   11.7 11.85     A7 84 0
3 V* SS For RR* 02 07 51.9785340895 -26 51 57.718876816   10.45 10.20     kF5hF8 97 0
4 V* RV Cet RR* 02 15 14.9042429419 -10 48 00.720756821   11.30 10.85     F 83 0
5 V* CS Eri RR* 02 37 05.7588255738 -42 57 48.034534805   9.25 9.03     A2/3(IIw) 63 0
6 V* RX For RR* 03 11 13.2184925149 -26 28 58.689781755   12.08 11.95     A1w 41 0
7 V* X Ret RR* 03 25 20.0924500443 -65 03 18.611710645   11.79 12.0     ~ 35 0
8 V* U Lep RR* 04 56 17.9853630613 -21 13 02.023837030   10.76 10.64     A8/F2(I) 96 0
9 V* RY Col RR* 05 15 07.7819726866 -41 37 41.674762068   10.59 10.45     A7 77 0
10 V* VW Dor RR* 06 07 45.7166890867 -66 58 38.870313622   12.43 11.79     A5III 45 0
11 V* RX Col RR* 06 13 14.7399612966 -37 15 00.565806562           ~ 42 0
12 V* UZ UMa RR* 08 18 53.9125352744 +73 05 47.925776041     14.44     A5 28 0
13 BPS BS 17581-0021 RR* 09 13 48.8070883268 -09 19 08.751139596   11.64 11.46 11.29   CEMP 79 0
14 V* WZ Hya RR* 10 13 24.1278067215 -13 08 17.396157119   10.47 10.27     A2 71 0
15 V* KQ Vel a2* 10 55 01.0018015910 -42 15 04.062281118 5.78 6.03 6.11     Ap(SiCr) 124 0
16 HD 94669 PM* 10 56 14.5183727948 +42 00 29.359157089   7.161 6.034     K2III 68 0
17 V* RV UMa RR* 13 33 18.0839321976 +53 59 14.600235593   10.97 10.9     F0 159 0
18 V* MW Lyr RR* 18 19 53.8178963804 +31 58 54.622000023           ~ 42 0
19 V* MT Tel RR* 19 02 12.2790753281 -46 39 12.080608287   9.14 8.94     A0w 62 0
20 V* XZ Dra RR* 19 09 42.6074440363 +64 51 32.134269050   10.40 10.12     F0 139 0
21 V* RR Lyr RR* 19 25 27.9123232234 +42 47 03.690634101   7.36   7.6   A8-F7 888 0
22 V* XZ Cyg RR* 19 32 29.3054833102 +56 23 17.494421260   9.94 9.68     A5-F7 250 0
23 V* RV Cap RR* 21 01 28.8699467368 -15 13 46.093069929   11.11 10.97     A8 93 0
24 V* V Ind RR* 21 11 29.9020123475 -45 04 28.391000404 10.67 10.714 10.246     F0V 87 0
25 V* BV Aqr RR* 22 02 53.9975628486 -21 31 32.149687158   11.27 11.05     ~ 37 0

    Equat.    Gal    SGal    Ecl

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2021.03.08-14:19:37

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