A spectroscopic survey of Herbig Ae/Be stars with X-shooter - I. Stellar parameters and accretion rates

J. R. Fairlamb, R. D. Oudmaijer, I. Mendigutía, John David Ilee, M. E. van den Ancker

Research output: Contribution to journalArticlepeer-review

92 Citations (Scopus)

Abstract

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
Original languageEnglish
Pages (from-to)976-1001
JournalMonthly Notices of the Royal Astronomical Society
Volume453
Issue number1
Early online date22 Aug 2015
DOIs
Publication statusPublished - 11 Oct 2015

Keywords

  • Accretion, accretion discs
  • Techniques: spectroscopic
  • Stars: early-type
  • Stars: formation
  • Stars: pre-main-sequence
  • Stars: variables: T Tauri, Herbig Ae/Be

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