Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.

Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.

We have observed UX Arietis at C band (6 cm) for 3 weeks with four Very Long Array (VLA) antennas. The temporal coverage during the program was approximately three scans per day. A few days into the VLA program, UX Ari began a radio flaring period which lasted for at least 2 weeks. All the radio flu...

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Main Authors: Elias II, Nicholas M., Quirrenbach, Andreas., Witzel, Arno., Naundorf, Christian E., Wegner, Ralf., Guinan, Edward F., McCook, George P.
Format: Villanova Faculty Authorship
Language:English
Published: 1994
Online Access:http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:176505
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spelling Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.
Elias II, Nicholas M.
Quirrenbach, Andreas.
Witzel, Arno.
Naundorf, Christian E.
Wegner, Ralf.
Guinan, Edward F.
McCook, George P.
We have observed UX Arietis at C band (6 cm) for 3 weeks with four Very Long Array (VLA) antennas. The temporal coverage during the program was approximately three scans per day. A few days into the VLA program, UX Ari began a radio flaring period which lasted for at least 2 weeks. All the radio fluxes were above the system noise during this episode, but the largest values (up to 270 mJy) occurred close to 0.0 phase. This phasing is confirmed by the UX Ari radio observations of Neidhofer, Massi & Chiuderi-Drago (1993). Visible-band light curves of UX Ari were obtained both during and after our radio observations; the peak-to-peak variation in all filters was approximately equal to 0.2 mag. The light curves indicate that the maximum starspot visibility occurred very close to 0.0 phase, the same phase as the radio maxima. Closer comparison of our radio and optical light curves indicates that they are almost perfectly anticorrelated. A similar radio/optical correlation has been found by Lim et al (1992) and Lim et al (1994) for the single KO V star and AB Dor. We make the following conclusions from our observations. First, the episodes of long-term (approximately hours to days) radio flaring were modulated by stellar eclipes. Second, the flares were located close to the starspot groups. Third, the sizes were compared to sized of the starspot groups, which is consistent with nonthermal emission of brightness temperature Tb approximately 1010-13 K. Fourth, the radio emission arose only from the midlatitude starspot groups. Last, the radio flares emitted their radiation nearly normal to the stellar surface.
1994-08-09
Villanova Faculty Authorship
vudl:176505
The Astrophysical Journal 439, 983-990.
en
dc.title_txt_mv Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.
dc.creator_txt_mv Elias II, Nicholas M.
Quirrenbach, Andreas.
Witzel, Arno.
Naundorf, Christian E.
Wegner, Ralf.
Guinan, Edward F.
McCook, George P.
dc.description_txt_mv We have observed UX Arietis at C band (6 cm) for 3 weeks with four Very Long Array (VLA) antennas. The temporal coverage during the program was approximately three scans per day. A few days into the VLA program, UX Ari began a radio flaring period which lasted for at least 2 weeks. All the radio fluxes were above the system noise during this episode, but the largest values (up to 270 mJy) occurred close to 0.0 phase. This phasing is confirmed by the UX Ari radio observations of Neidhofer, Massi & Chiuderi-Drago (1993). Visible-band light curves of UX Ari were obtained both during and after our radio observations; the peak-to-peak variation in all filters was approximately equal to 0.2 mag. The light curves indicate that the maximum starspot visibility occurred very close to 0.0 phase, the same phase as the radio maxima. Closer comparison of our radio and optical light curves indicates that they are almost perfectly anticorrelated. A similar radio/optical correlation has been found by Lim et al (1992) and Lim et al (1994) for the single KO V star and AB Dor. We make the following conclusions from our observations. First, the episodes of long-term (approximately hours to days) radio flaring were modulated by stellar eclipes. Second, the flares were located close to the starspot groups. Third, the sizes were compared to sized of the starspot groups, which is consistent with nonthermal emission of brightness temperature Tb approximately 1010-13 K. Fourth, the radio emission arose only from the midlatitude starspot groups. Last, the radio flares emitted their radiation nearly normal to the stellar surface.
dc.date_txt_mv 1994-08-09
dc.format_txt_mv Villanova Faculty Authorship
dc.identifier_txt_mv vudl:176505
dc.source_txt_mv The Astrophysical Journal 439, 983-990.
dc.language_txt_mv en
author Elias II, Nicholas M.
Quirrenbach, Andreas.
Witzel, Arno.
Naundorf, Christian E.
Wegner, Ralf.
Guinan, Edward F.
McCook, George P.
spellingShingle Elias II, Nicholas M.
Quirrenbach, Andreas.
Witzel, Arno.
Naundorf, Christian E.
Wegner, Ralf.
Guinan, Edward F.
McCook, George P.
Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.
author_facet Elias II, Nicholas M.
Quirrenbach, Andreas.
Witzel, Arno.
Naundorf, Christian E.
Wegner, Ralf.
Guinan, Edward F.
McCook, George P.
dc_source_str_mv The Astrophysical Journal 439, 983-990.
format Villanova Faculty Authorship
author_sort Elias II, Nicholas M.
dc_date_str 1994-08-09
dc_title_str Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.
description We have observed UX Arietis at C band (6 cm) for 3 weeks with four Very Long Array (VLA) antennas. The temporal coverage during the program was approximately three scans per day. A few days into the VLA program, UX Ari began a radio flaring period which lasted for at least 2 weeks. All the radio fluxes were above the system noise during this episode, but the largest values (up to 270 mJy) occurred close to 0.0 phase. This phasing is confirmed by the UX Ari radio observations of Neidhofer, Massi & Chiuderi-Drago (1993). Visible-band light curves of UX Ari were obtained both during and after our radio observations; the peak-to-peak variation in all filters was approximately equal to 0.2 mag. The light curves indicate that the maximum starspot visibility occurred very close to 0.0 phase, the same phase as the radio maxima. Closer comparison of our radio and optical light curves indicates that they are almost perfectly anticorrelated. A similar radio/optical correlation has been found by Lim et al (1992) and Lim et al (1994) for the single KO V star and AB Dor. We make the following conclusions from our observations. First, the episodes of long-term (approximately hours to days) radio flaring were modulated by stellar eclipes. Second, the flares were located close to the starspot groups. Third, the sizes were compared to sized of the starspot groups, which is consistent with nonthermal emission of brightness temperature Tb approximately 1010-13 K. Fourth, the radio emission arose only from the midlatitude starspot groups. Last, the radio flares emitted their radiation nearly normal to the stellar surface.
title Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.
title_full Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.
title_fullStr Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.
title_full_unstemmed Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.
title_short Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis.
title_sort correlations between the flaring radio emission and starspot distribution of ux arietis.
publishDate 1994
normalized_sort_date 1994-08-09T00:00:00Z
language English
collection_title_sort_str correlations between the flaring radio emission and starspot distribution of ux arietis.
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