Confirming HD 23478 as a new magnetic B star hosting an Hα-bright centrifugal magnetosphere
In this paper, we report 23 magnetic field measurements of the B3IV star HD23478: 12 obtained from high-resolution Stokes V spectra using the ESPaDOnS (Canada-France-Hawaii Telescope) and Narval (Télescope Bernard Lyot) spectropolarimeters, and 11 from mediumresolution Stokes V spectra obtained with...
Published in: | Monthly Notices of the Royal Astronomical Society |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press
2015
|
Subjects: | |
Online Access: | https://doi.org/10.1093/mnras/stv1051 https://nrc-publications.canada.ca/eng/view/object/?id=2f30ba72-94b2-49ff-93b2-8738d444efd4 https://nrc-publications.canada.ca/fra/voir/objet/?id=2f30ba72-94b2-49ff-93b2-8738d444efd4 |
id |
ftnrccanada:oai:cisti-icist.nrc-cnrc.ca:cistinparc:21276940 |
---|---|
record_format |
openpolar |
spelling |
ftnrccanada:oai:cisti-icist.nrc-cnrc.ca:cistinparc:21276940 2023-05-15T18:50:47+02:00 Confirming HD 23478 as a new magnetic B star hosting an Hα-bright centrifugal magnetosphere Sikora, J. Wade, G. A. Bohlender, D. A. Neiner, C. Oksala, M. E. Shultz, M. Cohen, D. H. Ud-Doula, A. Grunhut, J. Monin, D. Owocki, S. Petit, V. Rivinus, T. Townsend, R. H. D. 2015-08-01 text https://doi.org/10.1093/mnras/stv1051 https://nrc-publications.canada.ca/eng/view/object/?id=2f30ba72-94b2-49ff-93b2-8738d444efd4 https://nrc-publications.canada.ca/fra/voir/objet/?id=2f30ba72-94b2-49ff-93b2-8738d444efd4 eng eng Oxford University Press issn:0035-8711 Monthly Notices of the Royal Astronomical Society, Volume: 451, Issue: 2, Publication date: 2015-08-01, Pages: 1928–1938 doi:10.1093/mnras/stv1051 article 2015 ftnrccanada https://doi.org/10.1093/mnras/stv1051 2021-09-01T06:28:32Z In this paper, we report 23 magnetic field measurements of the B3IV star HD23478: 12 obtained from high-resolution Stokes V spectra using the ESPaDOnS (Canada-France-Hawaii Telescope) and Narval (Télescope Bernard Lyot) spectropolarimeters, and 11 from mediumresolution Stokes V spectra obtained with the DimaPol spectropolarimeter (Dominion Astronomical Observatory). HD23478 was one of two rapidly rotating stars identified as potential 'centrifugal magnetosphere' hosts based on IR observations from the Apache Point Observatory Galactic Evolution Experiment survey. We derive basic physical properties of this star including its mass (M = 6.1+0.8 -0.7 M⊙), effective temperature (Teff = 20 ± 2 kK), radius (R = 2.7+1.6 -0.9 R⊙), and age (τ age = 3+37 -1 Myr). We repeatedly detect weakly variable Zeeman signatures in metal, He, and H lines in all our observations corresponding to a longitudinal magnetic field of (Bz) ≈ -2.0 kG. The rotational period is inferred from Hipparcos photometry (Prot = 1.0498(4) d). Under the assumption of the Oblique RotatorModel, our observations yield a surface dipole magnetic field of strength Bd ≥ 9.5 kG that is approximately aligned with the stellar rotation axis. We confirm the presence of strong and broad Hα emission and gauge the volume of this star's centrifugal magnetosphere to be consistent with those of other Hα emitting centrifugal magnetosphere stars based on the large inferred Alfvén to Kepler radius ratio. Peer reviewed: Yes NRC publication: Yes Article in Journal/Newspaper narval narval National Research Council Canada: NRC Publications Archive Canada Monthly Notices of the Royal Astronomical Society 451 2 1928 1938 |
institution |
Open Polar |
collection |
National Research Council Canada: NRC Publications Archive |
op_collection_id |
ftnrccanada |
language |
English |
description |
In this paper, we report 23 magnetic field measurements of the B3IV star HD23478: 12 obtained from high-resolution Stokes V spectra using the ESPaDOnS (Canada-France-Hawaii Telescope) and Narval (Télescope Bernard Lyot) spectropolarimeters, and 11 from mediumresolution Stokes V spectra obtained with the DimaPol spectropolarimeter (Dominion Astronomical Observatory). HD23478 was one of two rapidly rotating stars identified as potential 'centrifugal magnetosphere' hosts based on IR observations from the Apache Point Observatory Galactic Evolution Experiment survey. We derive basic physical properties of this star including its mass (M = 6.1+0.8 -0.7 M⊙), effective temperature (Teff = 20 ± 2 kK), radius (R = 2.7+1.6 -0.9 R⊙), and age (τ age = 3+37 -1 Myr). We repeatedly detect weakly variable Zeeman signatures in metal, He, and H lines in all our observations corresponding to a longitudinal magnetic field of (Bz) ≈ -2.0 kG. The rotational period is inferred from Hipparcos photometry (Prot = 1.0498(4) d). Under the assumption of the Oblique RotatorModel, our observations yield a surface dipole magnetic field of strength Bd ≥ 9.5 kG that is approximately aligned with the stellar rotation axis. We confirm the presence of strong and broad Hα emission and gauge the volume of this star's centrifugal magnetosphere to be consistent with those of other Hα emitting centrifugal magnetosphere stars based on the large inferred Alfvén to Kepler radius ratio. Peer reviewed: Yes NRC publication: Yes |
format |
Article in Journal/Newspaper |
author |
Sikora, J. Wade, G. A. Bohlender, D. A. Neiner, C. Oksala, M. E. Shultz, M. Cohen, D. H. Ud-Doula, A. Grunhut, J. Monin, D. Owocki, S. Petit, V. Rivinus, T. Townsend, R. H. D. |
spellingShingle |
Sikora, J. Wade, G. A. Bohlender, D. A. Neiner, C. Oksala, M. E. Shultz, M. Cohen, D. H. Ud-Doula, A. Grunhut, J. Monin, D. Owocki, S. Petit, V. Rivinus, T. Townsend, R. H. D. Confirming HD 23478 as a new magnetic B star hosting an Hα-bright centrifugal magnetosphere |
author_facet |
Sikora, J. Wade, G. A. Bohlender, D. A. Neiner, C. Oksala, M. E. Shultz, M. Cohen, D. H. Ud-Doula, A. Grunhut, J. Monin, D. Owocki, S. Petit, V. Rivinus, T. Townsend, R. H. D. |
author_sort |
Sikora, J. |
title |
Confirming HD 23478 as a new magnetic B star hosting an Hα-bright centrifugal magnetosphere |
title_short |
Confirming HD 23478 as a new magnetic B star hosting an Hα-bright centrifugal magnetosphere |
title_full |
Confirming HD 23478 as a new magnetic B star hosting an Hα-bright centrifugal magnetosphere |
title_fullStr |
Confirming HD 23478 as a new magnetic B star hosting an Hα-bright centrifugal magnetosphere |
title_full_unstemmed |
Confirming HD 23478 as a new magnetic B star hosting an Hα-bright centrifugal magnetosphere |
title_sort |
confirming hd 23478 as a new magnetic b star hosting an hα-bright centrifugal magnetosphere |
publisher |
Oxford University Press |
publishDate |
2015 |
url |
https://doi.org/10.1093/mnras/stv1051 https://nrc-publications.canada.ca/eng/view/object/?id=2f30ba72-94b2-49ff-93b2-8738d444efd4 https://nrc-publications.canada.ca/fra/voir/objet/?id=2f30ba72-94b2-49ff-93b2-8738d444efd4 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
narval narval |
genre_facet |
narval narval |
op_relation |
issn:0035-8711 Monthly Notices of the Royal Astronomical Society, Volume: 451, Issue: 2, Publication date: 2015-08-01, Pages: 1928–1938 doi:10.1093/mnras/stv1051 |
op_doi |
https://doi.org/10.1093/mnras/stv1051 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
451 |
container_issue |
2 |
container_start_page |
1928 |
op_container_end_page |
1938 |
_version_ |
1766244544638091264 |