The exceptional Herbig Ae star HD 101412: The first detection of resolved magnetically split lines and the presence of chemical spots in a Herbig star
dc.contributor.author | Schöller, M. | en_US |
dc.contributor.author | Savanov, I. S. | en_US |
dc.contributor.author | Gonzälez, J. F. | en_US |
dc.contributor.author | Cowley, Charles R. | en_US |
dc.contributor.author | Schütz, O. | en_US |
dc.contributor.author | Arlt, R. | en_US |
dc.contributor.author | Rüdiger, G. | en_US |
dc.date.accessioned | 2010-05-07T18:07:11Z | |
dc.date.available | 2011-03-01T16:26:45Z | en_US |
dc.date.issued | 2010-04 | en_US |
dc.identifier.citation | SchÖller, M.; Savanov, I.; GonzÄlez, J.F.; Cowley, C.R.; SchÜtz, O.; Arlt, R.; RÜdiger, G. (2010). "The exceptional Herbig Ae star HD 101412: The first detection of resolved magnetically split lines and the presence of chemical spots in a Herbig star." Astronomische Nachrichten 331(4): 361-367. <http://hdl.handle.net/2027.42/71367> | en_US |
dc.identifier.issn | 0004-6337 | en_US |
dc.identifier.issn | 1521-3994 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/71367 | |
dc.description.abstract | In our previous search for magnetic fields in Herbig Ae stars, we pointed out that HD 101412 possesses the strongest magnetic field among the Herbig Ae stars and hence is of special interest for follow-up studies of magnetism among young pre-main-sequence stars. We obtained high-resolution, high signal-to-noise UVES and a few lower quality HARPS spectra revealing the presence of resolved magnetically split lines. HD 101412 is the first Herbig Ae star for which the rotational Doppler effect was found to be small in comparison to the magnetic splitting and several spectral lines observed in unpolarized light at high dispersion are resolved into magnetically split components. The measured mean magnetic field modulus varies from 2.5 to 3.5kG, while the mean quadratic field was found to vary in the range of 3.5 to 4.8 kG. To determine the period of variations, we used radial velocity, equivalent width, line width, and line asymmetry measurements of variable spectral lines of several elements, as well as magnetic field measurements. The period determination was done using the Lomb-Scargle method. The most pronounced variability was detected for spectral lines of He I and the iron peak elements, whereas the spectral lines of CNO elements are only slightly variable. From spectral variations and magnetic field measurements we derived a potential rotation period P rot = 13.86 d, which has to be proven in future studies with a larger number of observations. It is the first time that the presence of element spots is detected on the surface of a Herbig Ae/Be star. Our previous study of Herbig Ae stars revealed a trend towards stronger magnetic fields for younger Herbig Ae stars, confirmed by statistical tests. This is in contrast to a few other (non-statistical) studies claiming that magnetic Herbig Ae stars are progenitors of the magnetic Ap stars. New developments in MHD theory show that the measured magnetic field strengths are compatible with a current-driven instability of toroidal fields generated by differential rotation in the stellar interior. This explanation for magnetic intermediate-mass stars could be an alternative to a frozen-in fossil field (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) | en_US |
dc.format.extent | 388513 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | WILEY-VCH Verlag | en_US |
dc.subject.other | Physics | en_US |
dc.title | The exceptional Herbig Ae star HD 101412: The first detection of resolved magnetically split lines and the presence of chemical spots in a Herbig star | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Astronomy | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Astronomy, University of Michigan, Ann Arbor, MI 48109-1042, USA | en_US |
dc.contributor.affiliationother | European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei MÜnchen, Germany | en_US |
dc.contributor.affiliationother | Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, Moscow 119017, Russia | en_US |
dc.contributor.affiliationother | Instituto de Ciencias Astronomicas, de la Tierra, y del Espacio (ICATE), 5400 San Juan, Argentina | en_US |
dc.contributor.affiliationother | European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile | en_US |
dc.contributor.affiliationother | Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany | en_US |
dc.contributor.affiliationother | Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/71367/1/361_ftp.pdf | |
dc.identifier.doi | 10.1002/asna.201011346 | en_US |
dc.identifier.source | Astronomische Nachrichten | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
Files in this item
Remediation of Harmful Language
The University of Michigan Library aims to describe library materials in a way that respects the people and communities who create, use, and are represented in our collections. Report harmful or offensive language in catalog records, finding aids, or elsewhere in our collections anonymously through our metadata feedback form. More information at Remediation of Harmful Language.
Accessibility
If you are unable to use this file in its current format, please select the Contact Us link and we can modify it to make it more accessible to you.