X-ray accretion signatures in the close CTTS binary V4046 Sagittarii

2006/10/04 by H. M. Günther, C. Liefke, J. H. M. M. Schmitt +3 · 3 citations
Physics and Astronomy · #Accretion (finance) #Accretion disc #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Binary number #Binary star #Funnel #Intermediate polar #Spectral line #Stellar, planetary, and galactic studies #T Tauri star #astro-ph

paper · pdf · doi:10.1051/0004-6361:20066306

5 pages, 5 figures

arxiv created 2006/10/04 · openalex publication_date 2006/10/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present Chandra HETGS observations of the classical T Tauri star (CTTS) V4046 Sgr. The He-like triplets of , , and are clearly detected. Similar to the CTTS TW Hya and BP Tau, the forbidden lines of and are weak compared to the intercombination line, indicating high plasma densities in the X-ray emitting regions. The triplet, however, is within the low-density limit, in agreement with the predictions of the accretion funnel infall model with an additional stellar corona. V4046 Sgr is the first close binary exhibiting these features. Together with previous high-resolution X-ray data on TW Hya and BP Tau, and in contrast to T Tau, now three out of four CTTS show evidence of accretion funnels.

Citations

• Collisional Plasma Models with APEC/APED: Emission-Line Diagnostics of Hydrogen-like and Helium-like Ions
• On the sizes of stellar X-ray coronae
• X-ray emission from young stars in Taurus-Auriga-Perseus: Luminosity functions and the rotation -activity -age -relation

Cited by

• X-ray emitting MHD accretion shocks in classical T Tauri stars. Case for moderate to high plasma-β values
• The magnetosphere of the close accreting PMS binary V4046 Sgr
• A deep XMM-Newton X-ray observation of the Chamaeleon I dark cloud
• High-resolution X-ray spectroscopy of T Tauri stars in the Taurus-Auriga complex