uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
The dramatic change of the fossil magnetic field of HD 190073: Evidence of the birth of the convective core in a Herbig star?
Show others and affiliations
2013 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 549, L8- p.Article in journal (Refereed) Published
Abstract [en]

In the context of the ESPaDOnS and Narval spectropolarimetric surveys of Herbig Ae/Be stars, we discovered and then monitored the magnetic field of HD 190073 over more than four years, from 2004 to 2009. Our observations all displayed similar Zeeman signatures in the Stokes V spectra, indicating that HD 190073 hosted an aligned dipole, stable over many years, consistent with a fossil origin. We obtained new observations of the star in 2011 and 2012 and detected clear variations of the Zeeman signature on timescales of days to weeks, indicating that the configuration of its field has changed between 2009 and 2011. Such a sudden change of external structure of a fossil field has never previously been observed in any intermediate or high-mass star. HD 190073 is an almost entirely radiative pre-main sequence star, probably hosting a growing convective core. We propose that this dramatic change is the result of the interaction between the fossil field and the ignition of a dynamo field generated in the newly-born convective core.

Place, publisher, year, edition, pages
2013. Vol. 549, L8- p.
Keyword [en]
Stars: early-type, Stars: evolution, Stars: individual: HD 190073, Stars: magnetic field, Stars: pre-main sequence
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-194915DOI: 10.1051/0004-6361/201220796ISI: 000313745000160OAI: oai:DiVA.org:uu-194915DiVA: diva2:606576
Available from: 2013-02-19 Created: 2013-02-19 Last updated: 2013-02-26Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Kochukhov, Oleg
By organisation
Department of Physics and Astronomy
In the same journal
Astronomy and Astrophysics
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 146 hits
ReferencesLink to record
Permanent link

Direct link