ICATE   21876
INSTITUTO DE CIENCIAS ASTRONOMICAS, DE LA TIERRA Y DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Spectroscopic signatures of magnetospheric accretion in Herbig Ae/Be stars I. The case of HD 101412
Autor/es:
POGODIN, M. A.; HUBRIG, S.; WOLFF, B.; CAHUASQUÍ, J. A.; ILYIN, I.; PETR-GOTZENS, M. G.; GONZÁLEZ, J.F.; JÄRVINEN, S.; SCHÖLLER, M.; DRAKE, N.A.; SAVANOV, I.; MYSORE, S.; STELZER, B.
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2016 vol. 592 p. 1 - 8
ISSN:
0004-6361
Resumen:
Context. Models of magnetically-driven accretion and outflows reproduce many observational properties of T Tauri stars. This concept is not well established for the more massive Herbig Ae/Be stars.Aims. We intend to examine the magnetospheric accretion in Herbig Ae/Be stars and search for rotational modulation using spectroscopic signatures, in this first paper concentrating on the well-studied Herbig Ae star HD 101412.Methods. We used near-infrared spectroscopic observations of the magnetic Herbig Ae star HD 101412 to test the magnetospheric character of its accretion disk/star interaction. We reduced and analyzed 30 spectra of HD 101412, acquired with the CRIRES and X-shooter spectrographs installed at the VLT (ESO, Chile). The spectroscopic analysis was based on the He i λ10 830 and Paγ lines, formed in the accretion region.Results. We found that the temporal behavior of these diagnostic lines in the near-infrared spectra of HD 101412 can be explained by rotational modulation of line profiles generated by accreting gas with a period P = 20 d .53 ± 1 d .68. The discovery of this period, about half of the magnetic rotation period P m = 42 d .076 previously determined from measurements of the mean longitudinal magnetic field, indicates that the accreted matter falls onto the star in regions close to the magnetic poles intersecting the line-of-sight two times during the rotation cycle. We intend to apply this method to a larger sample of Herbig Ae/Be stars.