Universität zu Köln

Schoeller, M., Pogodin, M. A., Cahuasqui, J. A., Drake, N. A., Hubrig, S., Petr-Gotzens, M. G., Savanov, I. S., Wolff, B., Gonzalez, J. F., Mysore, S., Ilyin, I., Jaervinen, S. P. and Stelzer, B. (2016). Spectroscopic signatures of magnetospheric accretion in Herbig Ae/Be stars. Astron. Astrophys., 592. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

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 lambda 10 830 and Pa gamma 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schoeller, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pogodin, M. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cahuasqui, J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Drake, N. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hubrig, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petr-Gotzens, M. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Savanov, I. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wolff, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gonzalez, J. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mysore, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ilyin, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jaervinen, S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stelzer, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-268679
DOI:	10.1051/0004-6361/201628361
Journal or Publication Title:	Astron. Astrophys.
Volume:	592
Date:	2016
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HE-I LAMBDA-10830; T TAURI STARS; DISK ACCRETION; HD 101412; AE STAR; 3-DIMENSIONAL SIMULATIONS; INCLINED DIPOLE; MAGNETIC-FIELD; ABUNDANCES; FLOWS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26867