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

Autor: I. Mendigutía, M. E. van den Ancker, Rene D. Oudmaijer, J. R. Fairlamb, John D. Ilee
Přispěvatelé: University of St Andrews. School of Physics and Astronomy
Rok vydání: 2015
Předmět:
Astrophysics::High Energy Astrophysical Phenomena
NDAS
FOS: Physical sciences
Context (language use)
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
01 natural sciences
Spectral line
spectroscopic [Techniques]
Luminosity
early-type [Stars]
0103 physical sciences
QB Astronomy
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
formation [Stars]
QC
Astrophysics::Galaxy Astrophysics
QB
pre-main-sequence [Stars]
Physics
Very Large Telescope
010308 nuclear & particles physics
Astronomy
Astronomy and Astrophysics
Herbig Ae/Be star
Accretion (astrophysics)
T Tauri star
Stars
QC Physics
Astrophysics - Solar and Stellar Astrophysics
Accretion
accretion discs
Space and Planetary Science
Astrophysics::Earth and Planetary Astrophysics
variables: T Tauri
Herbig Ae/Be [Stars]
Zdroj: Monthly Notices of the Royal Astronomical Society. 453:976-1001
ISSN: 1365-2966
0035-8711
DOI: 10.1093/mnras/stv1576
Popis: Herbig Ae/Be stars 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 VLT/X-Shooter spectra of 91 Herbig Ae/Be stars, 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 ultra-violet (UV) 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 the Herbig Be mass range.
Comment: 29 pages, 19 figures, Accepted for publication in MNRAS
Databáze: OpenAIRE
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