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


Query : 2009A&A...498..543K

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 - 2023
#notes
1 V* RU Scl RR* 00 02 48.1070566536 -24 56 43.074744252   10.991 10.563 10.24 10.069 F0/2V 94 0
2 V* RX Cet RR* 00 33 38.2801924320 -15 29 14.802914472   11.7 11.85     A7 98 0
3 V* SS For RR* 02 07 51.9781810872 -26 51 57.716828856   10.45 10.20     kF5hF8 108 0
4 V* RV Cet RR* 02 15 14.9042875944 -10 48 00.718115472   11.30 10.85     kA0hF0 94 0
5 V* CS Eri RR* 02 37 05.7588329711 -42 57 48.035460221   9.25 9.03     A2/3(IIw) 78 0
6 V* RX For RR* 03 11 13.2184720032 -26 28 58.688531040   12.08 11.95     kA9hF6 46 0
7 V* X Ret RR* 03 25 20.0924162976 -65 03 18.610091388   11.79 12.0     kA5hA9 38 0
8 V* U Lep RR* 04 56 17.9852660208 -21 13 02.024591448   10.76 10.64     A8/F2(I) 107 0
9 V* RY Col RR* 05 15 07.7818581648 -41 37 41.674798776   10.59 10.45     A7 86 0
10 V* VW Dor RR* 06 07 45.7163792160 -66 58 38.869098636   12.43 11.79     A5III 55 0
11 V* RX Col RR* 06 13 14.7399958536 -37 15 00.566702568           ~ 47 0
12 V* UZ UMa RR* 08 18 53.9127454200 +73 05 47.926302000     14.44     A5 28 0
13 V* SZ Hya RR* 09 13 48.8071464504 -09 19 08.753215872   11.64 11.46 11.29   kA1hA7 89 0
14 V* WZ Hya RR* 10 13 24.1278993288 -13 08 17.397051972   10.47 10.27     kA8.5hF6 82 0
15 V* KQ Vel a2* 10 55 01.0131717072 -42 15 03.962480184 5.78 6.03 6.11     Ap(SiCr) 132 0
16 HD 94669 PM* 10 56 14.5186611456 +42 00 29.357085060   7.161 6.034     K2III 73 0
17 V* RV UMa RR* 13 33 18.0838837128 +53 59 14.598026988   10.97 10.9     kA9hF7 171 0
18 V* MW Lyr RR* 18 19 53.8179512304 +31 58 54.622695360           ~ 43 0
19 V* MT Tel RR* 19 02 12.2792561239 -46 39 12.083789084   9.14 8.94     A0w 76 0
20 V* XZ Dra RR* 19 09 42.6071961192 +64 51 32.137892820   10.40 10.12     kA3.5hA8 150 0
21 V* RR Lyr RR* 19 25 27.9129605304 +42 47 03.693258204   7.36   7.6   kA3hF0 912 0
22 V* XZ Cyg RR* 19 32 29.3050827744 +56 23 17.494181700   9.94 9.68     kA1.5hA8 260 0
23 V* RV Cap RR* 21 01 28.8700813584 -15 13 46.090360344   11.11 10.97     kA1.5hA6.5 101 0
24 V* V Ind RR* 21 11 29.9019440989 -45 04 28.391364755 10.67 10.714 10.246     F0V 106 0
25 V* BV Aqr RR* 22 02 53.9976005136 -21 31 32.147256936   11.27 11.05     ~ 48 0

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2023.10.04-09:01:28

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