A spectroscopic survey of Herbig Ae/Be stars with X-shooter – I. Stellar parameters and accretion rates
By J. Fairlamb, R. D. Oudmaijer, I. Mendigut'ia, J. Ilee, M. V. D. Ancker. 2015
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Herbig Ae/Be stars (HAeBes) span a key mass range that links low- and high-mass stars, and thus provide an ideal window from which to explore their formation. This paper presents Very Large Telescope/X-shooter spectra of 91 HAeBes, the largest spectroscopic study of HAeBe accretion to date. A homogeneous approach to determining stellar parameters is undertaken for the majority of the sample. Measurements of the ultraviolet are modelled within the context of magnetospheric accretion, allowing a direct determination of mass accretion rates. Multiple correlations are observed across the sample between accretion and stellar properties: the youngest and often most massive stars are the strongest accretors, and there is an almost 1:1 relationship between the accretion luminosity and stellar luminosity. Despite these overall trends of increased accretion rates in HAeBes when compared to classical T Tauri stars, we also find noticeable differences in correlations when considering the Herbig Ae and Herbig Be subsets. This, combined with the difficulty in applying a magnetospheric accretion model to some of the Herbig Be stars, could suggest that another form of accretion may be occurring within Herbig Be mass range.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/bdb1184b5580056ad17eaa05f57065a068650439
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In Astronomy and Astrophysics
Citations in the corpus
- Accretion disks in luminous young stellar objects (2015, methodology): “Systematic studies determining Ṁacc in the disks of HAeBe stars have so far used either the Brγ line (Garcia Lopez et al., 2006, with a sample restricted to A-type stars) or the Balmer continuum excess (Donehew & Brittain, 2011; Mendigutı́a et al., 2011; Fairlamb et al., 2015).”
- Molecules with ALMA at Planet-forming Scales (MAPS). I. Program Overview and Highlights (2021, background): “The age of HD 163296 is somewhat unclear, but most studies suggest it is at least 6 Myrs old (Fairlamb et al. 2015; Wichittanakom et al. 2020).”
- Accretion onto Pre-Main-Sequence Stars (2016, methodology): “Direct measurements of accretion rates have been made for intermediate-mass and HAeBe stars (Calvet et al. 2004, Donehew & Brittain 2011, Mendigutia et al. 2011, Fairlamb et al. 2015) down to the substellar regime (e.g., Herczeg et al. 2009, Rigliaco et al. 2012, Zhou et al. 2014).”