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Sökning: WFRF:(Piskunov Nikolai professor 1957 ) > (2023) > Determination of sm...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00006735naa a2200613 4500
001oai:DiVA.org:uu-509279
003SwePub
008230823s2023 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5092792 URI
0247 a https://doi.org/10.1051/0004-6361/2023463142 DOI
040 a (SwePub)uu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Hahlin, Axelu Uppsala universitet,Institutionen för fysik och astronomi4 aut0 (Swepub:uu)axeha391
2451 0a Determination of small-scale magnetic fields on Sun-like stars in the near-infrared using CRIRES+
264 1b EDP Sciences,c 2023
338 a electronic2 rdacarrier
520 a Aims: We aim to characterise the small-scale magnetic fields of a sample of 16 Sun-like stars and investigate the capabilities of the newly upgraded near-infrared (NIR) instrument CRIRES+ at the Very Large Telescope in the context of small-scale magnetic field studies. Our targets also had their magnetic fields studied with optical spectra, which allowed us to compare magnetic field properties at different spatial scales on the stellar surface and to contrast small-scale magnetic field measurements at different wavelengths.Methods: We analysed the Zeeman broadening signature for six magnetically sensitive and insensitive Fe I lines in the H-band to measure small-scale magnetic fields on the stellar surfaces of our sample. We used polarised radiative transfer modelling and non-local thermodynamic equilibrium departure coefficients in combination with Markov chain Monte Carlo sampling to determine magnetic field characteristics and non-magnetic stellar parameters. We used two different approaches to describe the small-scale magnetic fields. The first is a two-component model with a single magnetic region and a free magnetic field strength. The second model contains multiple magnetic components with fixed magnetic field strengths.Results: We found average magnetic field strengths ranging from & SIM;0.4 kG down to < 0.1 kG. The results align closely with other results from high-resolution NIR spectrographs, such as SPIRou. It appears that the typical magnetic field strength in the magnetic region is slightly stronger than 1.3 kG, and for most stars in our sample, this strength is between 1 and 2 kG. We also found that the small-scale fields correlate with the large-scale fields and that the small-scale fields are at least ten times stronger than the large-scale fields inferred with Zeeman Doppler imaging. The two- and multi-component models produce systematically different results, as the strong fields from the multi-component model increase the obtained mean magnetic field strength. When comparing our results with the optical measurements of small-scale fields, we found a systematic offset two to three times stronger than fields in the optical results. This discrepancy cannot be explained by uncertainties in stellar parameters. Care should therefore be taken when comparing results obtained at different wavelengths until a clear cause can be established.
650 7a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng
650 7a NATURVETENSKAPx Fysikx Den kondenserade materiens fysik0 (SwePub)103042 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Condensed Matter Physics0 (SwePub)103042 hsv//eng
653 a stars
653 a magnetic field
653 a solar-type
653 a techniques
653 a spectroscopic
7001 a Kochukhov, Olegu Uppsala universitet,Institutionen för fysik och astronomi4 aut0 (Swepub:uu)oko28508
7001 a Rains, Adamu Uppsala universitet,Institutionen för fysik och astronomi4 aut0 (Swepub:uu)adara884
7001 a Lavail, Alexisu Uppsala universitet,Institutionen för fysik och astronomi,Univ Toulouse, Inst Rech Astrophys & Planetol, CNRS, IRAP,UMR 5277, 14 Ave Edouard Belin, F-31400 Toulouse, France.4 aut0 (Swepub:uu)alela313
7001 a Hatzes, A.u Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany.4 aut
7001 a Piskunov, Nikolai,c professor,d 1957-u Uppsala universitet,Institutionen för fysik och astronomi4 aut0 (Swepub:uu)nikopisk
7001 a Reiners, A.u Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.4 aut
7001 a Seemann, U.u Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.;European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.4 aut
7001 a Boldt-Christmas, Linnu Uppsala universitet,Observationell astrofysik4 aut0 (Swepub:uu)linbo171
7001 a Guenther, E. W.u Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany.4 aut
7001 a Heiter, Ulrikeu Uppsala universitet,Institutionen för fysik och astronomi4 aut0 (Swepub:uu)ulhei450
7001 a Nortmann, L.u Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.4 aut
7001 a Yan, F.u Univ Sci & Technol China, Dept Astron, 96 JinZhai Rd, Hefei 230026, Anhui, Peoples R China.4 aut
7001 a Shulyak, D.u CSIC, Inst Astrofis Andalucia, C Glorieta Astron S-N, Granada 18008, Spain.4 aut
7001 a Smoker, J. V.u European Southern Observ, Alonso Cordova 3107, Santiago, Chile.;Royal Observ, UK Astron Technol Ctr, Blackford Hill, Edinburgh EH9 3HJ, Scotland.4 aut
7001 a Rodler, F.u European Southern Observ, Alonso Cordova 3107, Santiago, Chile.4 aut
7001 a Bristow, P.u European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.4 aut
7001 a Dorn, R. J.u European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.4 aut
7001 a Jung, Y.u European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.4 aut
7001 a Marquart, Thomas,d 1978-u Uppsala universitet,Observationell astrofysik4 aut0 (Swepub:uu)thmar499
7001 a Stempels, H. C.u Uppsala universitet,Institutionen för fysik och astronomi4 aut0 (Swepub:uu)ericstem
7102 a Uppsala universitetb Institutionen för fysik och astronomi4 org
7730 t Astronomy and Astrophysicsd : EDP Sciencesg 675q 675x 0004-6361x 1432-0746
8564 u https://uu.diva-portal.org/smash/get/diva2:1790499/FULLTEXT01.pdfx primaryx Raw objecty fulltext:print
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-509279
8564 8u https://doi.org/10.1051/0004-6361/202346314

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