Wichittanakom, C, Oudmaijer, RD orcid.org/0000-0001-7703-3992, Fairlamb, JR et al. (3 more authors) (2020) The accretion rates and mechanisms of Herbig Ae/Be stars. Monthly Notices of the Royal Astronomical Society, 493 (1). pp. 234-249. ISSN 0035-8711
Abstract
This work presents a spectroscopic study of 163 Herbig Ae/Be stars. Amongst these, we present new data for 30 objects. Stellar parameters such as temperature, reddening, mass, luminosity, and age are homogeneously determined. Mass accretion rates are determined from Hα emission line measurements. Our data is complemented with the X-Shooter sample from previous studies and we update results using Gaia DR2 parallaxes giving a total of 78 objects with homogeneously determined stellar parameters and mass accretion rates. In addition, mass accretion rates of an additional 85 HAeBes are determined. We confirm previous findings that the mass accretion rate increases as a function of stellar mass, and the existence of a different slope for lower and higher mass stars, respectively. The mass where the slope changes is determined tobe 3.98+1.37−0.94M⊙. We discuss this break in the context of different modes of disc accretion for low- and high-mass stars. Because of their similarities with T Tauri stars, we identify the accretion mechanism for the late-type Herbig stars with the Magnetospheric Accretion. The possibilities for the earlier-type stars are still open, we suggest the Boundary Layer accretion model may be a viable alternative. Finally, we investigated themass accretion–age relationship. Even using the superior Gaia based data, it proved hard to select a large enough sub-sample to remove the mass dependence in this relationship. Yet, it would appear that the mass accretion does decline with age as expected from basic theoretical considerations.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © The Author(s) 2020. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | accretion, accretion discs, techniques: spectroscopic, stars: formation, stars: fundamental parameters, stars: pre-main-sequence, stars: variables: T Tauri, Herbig Ae/Be |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) |
Funding Information: | Funder Grant number STFC (Science and Technology Facilities Council) ST/M002160/1 STFC (Science and Technology Facilities Council) ST/F002092/1 STFC (Science and Technology Facilities Council) ST/L000628/1 STFC (Science and Technology Facilities Council) ST/P005527/1 STFC (Science and Technology Facilities Council) ST/P00041X/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Mar 2020 13:29 |
Last Modified: | 25 Jun 2023 22:11 |
Status: | Published |
Publisher: | Oxford University Press (OUP) |
Identification Number: | 10.1093/mnras/staa169 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:158045 |