The auroral radio emission of the magnetic B-type star rho OphC

J 2020

The auroral radio emission of the magnetic B-type star rho OphC

LETO, P., C. TRIGILIO, C. S. BUEMI, F. LEONE, I. PILLITTERI et. al.

Základní údaje

Originální název

The auroral radio emission of the magnetic B-type star rho OphC

Autoři

LETO, P., C. TRIGILIO, C. S. BUEMI, F. LEONE, I. PILLITTERI, L. FOSSATI, F. CAVALLARO, L. M. OSKINOVA, R. IGNACE, Jiří KRTIČKA (203 Česká republika, garant, domácí), G. UMANA, G. CATANZARO, A. INGALLINERA, F. BUFANO, S. RIGGI, L. CERRIGONE, S. LORU, F. SCHILLIRO, C. AGLIOZZO, N. M. PHILLIPS, M. GIARRUSSO a J. ROBRADE

Vydání

Monthly Notices of the Royal Astronomical Society, Oxford, Oxford University Press, 2020, 1745-3925

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Kód RIV

RIV/00216224:14310/20:00114555

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1093/mnrasl/slaa157

UT WoS

000587776700015

Klíčová slova anglicky

masers; stars: early-type; stars: individual: rho OphC; stars: magnetic field; radio continuum: stars; X-rays: stars

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 29. 4. 2021 12:32, Mgr. Marie Šípková, DiS.

Anotace

V originále

The non-thermal radio emission of main-sequence early-type stars is a signature of stellar magnetism. We present multiwavelength (1.6-16.7 GHz) ATCA measurements of the early-type magnetic star rho OphC, which is a flat-spectrum non-thermal radio source. The rho OphC radio emission is partially circularly polarized with a steep spectral dependence: the fraction of polarized emission is about 60 per cent at the lowest frequency sub-band (1.6 GHz) while is undetected at 16.7 GHz. This is clear evidence of coherent Auroral Radio Emission (ARE) from the rho OphC magnetosphere. Interestingly, the detection of the rho OphC's ARE is not related to a peculiar rotational phase. This is a consequence of the stellar geometry, which makes the strongly anisotropic radiation beam of the amplified radiation always pointed towards Earth. The circular polarization sign evidences mainly amplification of the ordinary mode of the electromagnetic wave, consistent with a maser amplification occurring within dense regions. This is indirect evidence of the plasma evaporation from the polar caps, a phenomenon responsible for the thermal X-ray aurorae. rho OphC is not the first early-type magnetic star showing the O-mode dominated ARE but is the first star with the ARE always on view.

Návaznosti

GA18-05665S, projekt VaV

Název: Ztráta hmoty v pozdních fázích vývoje hmotných hvězd

Investor: Grantová agentura ČR, Ztráta hmoty v pozdních fázích vývoje hmotných hvězd

Citovat

LETO, P., C. TRIGILIO, C. S. BUEMI, F. LEONE, I. PILLITTERI, L. FOSSATI, F. CAVALLARO, L. M. OSKINOVA, R. IGNACE, Jiří KRTIČKA, G. UMANA, G. CATANZARO, A. INGALLINERA, F. BUFANO, S. RIGGI, L. CERRIGONE, S. LORU, F. SCHILLIRO, C. AGLIOZZO, N. M. PHILLIPS, M. GIARRUSSO a J. ROBRADE. The auroral radio emission of the magnetic B-type star rho OphC. Monthly Notices of the Royal Astronomical Society. Oxford: Oxford University Press, 2020, roč. 499, č. 1, s. "L72"-"L76", 5 s. ISSN 1745-3925. Dostupné z: https://dx.doi.org/10.1093/mnrasl/slaa157.

@article{1706059,
   author = {Leto, P. and Trigilio, C. and Buemi, C. S. and Leone, F. and Pillitteri, I. and Fossati, L. and Cavallaro, F. and Oskinova, L. M. and Ignace, R. and Krtička, Jiří and Umana, G. and Catanzaro, G. and Ingallinera, A. and Bufano, F. and Riggi, S. and Cerrigone, L. and Loru, S. and Schilliro, F. and Agliozzo, C. and Phillips, N. M. and Giarrusso, M. and Robrade, J.},
   article_location = {Oxford},
   article_number = {1},
   doi = {http://dx.doi.org/10.1093/mnrasl/slaa157},
   keywords = {masers; stars: early-type; stars: individual: rho OphC; stars: magnetic field; radio continuum: stars; X-rays: stars},
   language = {eng},
   issn = {1745-3925},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {The auroral radio emission of the magnetic B-type star rho OphC},
   url = {https://doi.org/10.1093/mnrasl/slaa157},
   volume = {499},
   year = {2020}
}

TY  - JOUR
ID  - 1706059
AU  - Leto, P. - Trigilio, C. - Buemi, C. S. - Leone, F. - Pillitteri, I. - Fossati, L. - Cavallaro, F. - Oskinova, L. M. - Ignace, R. - Krtička, Jiří - Umana, G. - Catanzaro, G. - Ingallinera, A. - Bufano, F. - Riggi, S. - Cerrigone, L. - Loru, S. - Schilliro, F. - Agliozzo, C. - Phillips, N. M. - Giarrusso, M. - Robrade, J.
PY  - 2020
TI  - The auroral radio emission of the magnetic B-type star rho OphC
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 499
IS  - 1
SP  - "L72"-"L76"
EP  - "L72"-"L76"
PB  - Oxford University Press
SN  - 17453925
KW  - masers
KW  - stars: early-type
KW  - stars: individual: rho OphC
KW  - stars: magnetic field
KW  - radio continuum: stars
KW  - X-rays: stars
UR  - https://doi.org/10.1093/mnrasl/slaa157
L2  - https://doi.org/10.1093/mnrasl/slaa157
N2  - The non-thermal radio emission of main-sequence early-type stars is a signature of stellar magnetism. We present multiwavelength (1.6-16.7 GHz) ATCA measurements of the early-type magnetic star rho OphC, which is a flat-spectrum non-thermal radio source. The rho OphC radio emission is partially circularly polarized with a steep spectral dependence: the fraction of polarized emission is about 60 per cent at the lowest frequency sub-band (1.6 GHz) while is undetected at 16.7 GHz. This is clear evidence of coherent Auroral Radio Emission (ARE) from the rho OphC magnetosphere. Interestingly, the detection of the rho OphC's ARE is not related to a peculiar rotational phase. This is a consequence of the stellar geometry, which makes the strongly anisotropic radiation beam of the amplified radiation always pointed towards Earth. The circular polarization sign evidences mainly amplification of the ordinary mode of the electromagnetic wave, consistent with a maser amplification occurring within dense regions. This is indirect evidence of the plasma evaporation from the polar caps, a phenomenon responsible for the thermal X-ray aurorae. rho OphC is not the first early-type magnetic star showing the O-mode dominated ARE but is the first star with the ARE always on view.
ER  -

LETO, P., C. TRIGILIO, C. S. BUEMI, F. LEONE, I. PILLITTERI, L. FOSSATI, F. CAVALLARO, L. M. OSKINOVA, R. IGNACE, Jiří KRTIČKA, G. UMANA, G. CATANZARO, A. INGALLINERA, F. BUFANO, S. RIGGI, L. CERRIGONE, S. LORU, F. SCHILLIRO, C. AGLIOZZO, N. M. PHILLIPS, M. GIARRUSSO a J. ROBRADE. The auroral radio emission of the magnetic B-type star rho OphC. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: Oxford University Press, 2020, roč.~499, č.~1, s.~''L72''-''L76'', 5 s. ISSN~1745-3925. Dostupné z: https://dx.doi.org/10.1093/mnrasl/slaa157.

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