2017MNRAS.472.3554S


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.15CEST19:39:55

2017MNRAS.472.3554S - Mon. Not. R. Astron. Soc., 472, 3554-3563 (2017/December-2)

The multi-line slope method for measuring the effective magnetic field of cool stars: an application to the solar-like cycle of ε Eri.

SCALIA C., LEONE F., GANGI M., GIARRUSSO M. and STIFT M.J.

Abstract (from CDS):

One method for the determination of integrated longitudinal stellar fields from low-resolution spectra is the so-called slope method, which is based on the regression of the Stokes V signal against the first derivative of Stokes I. Here we investigate the possibility of extending this technique to measure the magnetic fields of cool stars from high-resolution spectra. For this purpose we developed a multi-line modification to the slope method, called the multi-line slope method. We tested this technique by analysing synthetic spectra computed with the COSSAM code and real observations obtained with the high-resolution spectropolarimeters Narval, HARPSpol and the Catania Astrophysical Observatory Spectropolarimeter (CAOS). We show that the multi-line slope method is a fast alternative to the least squares deconvolution technique for the measurement of the effective magnetic fields of cool stars. Using a Fourier transform on the effective magnetic field variations of the star ε Eri, we find that the long-term periodicity of the field corresponds to the 2.95-yr period of the stellar dynamo, revealed by the variation of the activity index.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): polarization - stars: late-type - stars: magnetic field - stars: magnetic field

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1658 1
2 * 83 Leo B PM* 11 26 46.2784696716 +03 00 22.757061950 9.467 8.554 7.530 6.97 6.508 K3 166 1
3 * ksi Boo BY* 14 51 23.37993 +19 06 01.6994 5.618 5.370 4.593 3.91 3.48 G7Ve+K5Ve 428 0
4 HD 200466 ** 21 02 21.90501 +37 39 13.9374           K0V+K0V 35 0
5 HD 219542 ** 23 16 35.23827 -01 35 11.4798   8.25 7.59     G(5)+(A) 38 0

    Equat.    Gal    SGal    Ecl

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2019.10.15-19:39:55

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