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28 March 2024 |
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Spectroscopic signatures of magnetospheric accretion in Herbig Ae/Be stars. I. The case of HD101412 | M. Schöller
; M.A. Pogodin
; J.A. Cahuasqui
; N.A. Drake
; S. Hubrig
; M.G. Petr-Gotzens
; I.S. Savanov
; B. Wolff
; J.F. Gonzalez
; S. Mysore
; I. Ilyin
; S.P. Jarvinen
; B. Stelzer
; | Date: |
13 Jun 2016 | Abstract: | 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. 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 HD101412. We used near-infrared spectroscopic
observations of the magnetic Herbig Ae star HD101412 to test the magnetospheric
character of its accretion disk/star interaction. We reduced and analyzed 30
spectra of HD101412, 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. We found
that the temporal behavior of these diagnostic lines in the near-infrared
spectra of HD101412 can be explained by rotational modulation of line profiles
generated by accreting gas with a period P = 20.53+-1.68 d. The discovery of
this period, about half of the magnetic rotation period P_m = 42.076 d
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. | Source: | arXiv, 1606.3817 | Services: | Forum | Review | PDF | Favorites |
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