2019/01/13 by Markus Scholler, Schöller, Markus, S. Hubrig +9
Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR)
paper · pdf · doi:10.48550/arxiv.1901.03978
openalex publication_date 2019/01/13 · openalex created_date 2019/12/26 · openalex updated_date 2026/07/28
Models of magnetically driven accretion and outflows reproduce many\nobservational properties of T Tauri stars. For the more massive Herbig Ae/Be\nstars, the corresponding picture is not well established. Nonetheless, it is\nexpected that accretion flows in pre-main-sequence stars are guided from the\ncircumstellar disk to stellar regions of high latitude along the magnetic field\nlines inside a magnetosphere. Using near-infrared multi-epoch spectroscopic\ndata obtained with ISAAC, CRIRES, and X-shooter on the VLT, we examined\nmagnetospheric accretion in the two Herbig Ae stars HD101412 and HD104237.\nSpectroscopic signatures in He I 10830 and Pagamma, two near-infrared lines\nthat are formed in a Herbig star's accretion region, show temporal modulation\nin both objects. For HD101412, this modulation is governed by its rotation\nperiod, which we could recover from the data. We could show that our\nspectroscopic observations can be explained within the magnetic geometry that\nwe established earlier from magnetic field measurements. For HD104237, we\nstruggled to clearly identify a rotation period. We intend to apply this method\nto a larger sample of Herbig Ae/Be stars to learn more about their rotation\nproperties and the accretion mechanisms at work.\n