期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 453, 期 1, 页码 976-1001出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1576
关键词
accretion, accretion discs; techniques: spectroscopic; stars: early-type; stars: formation; stars: pre-main-sequence; stars: variables: T Tauri, Herbig Ae/Be
资金
- Science and Technology Facilities Council of the UK
- European Union FP7 [284405]
- STFC [ST/L000628/1, ST/I505772/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I505772/1] Funding Source: researchfish
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.
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