Vioque, M, Oudmaijer, R orcid.org/0000-0001-7703-3992, Wichittanakom, C et al. (6 more authors) (2022) Identification and Spectroscopic Characterization of 128 New Herbig Stars. The Astrophysical Journal, 930 (1). 39. ISSN 0004-637X
Abstract
We present optical spectroscopy observations of 145 high-mass pre-main-sequence candidates from the catalog of Vioque et al. 2020 From these, we provide evidence for the Herbig nature of 128 sources. This increases the number of known objects of the class by ∼50%. We determine the stellar parameters of these sources using the spectra and Gaia EDR3 data. The new sources are well distributed in mass and age, with 23 sources between 4 and 8 M⊙ and 32 sources above 8 M⊙. Accretion rates are inferred from Hα and Hβ luminosities for 104 of the new Herbigs. These accretion rates, combined with previous similar estimates, allow us to analyze the accretion properties of Herbig stars using the largest sample ever considered. We provide further support to the existence of a break in accretion properties at ∼3–4 M⊙, which was already reported for the previously known Herbig stars. We re-estimate the potential break in accretion properties to be at ${3.87}_{-0.96}^{+0.38}$ M⊙. As observed for the previously known Herbig stars, the sample of new Herbig stars independently suggests intense inner-disk photoevaporation for sources with masses above ∼7 M⊙. These observations provide robust observational support to the accuracy of the Vioque et al. 2020 catalog of Herbig candidates.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022. The Author(s). Published by the American Astronomical Society. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Herbig Ae/Be stars; Star formation; Pre-main sequence stars; Young stellar objects; Massive stars; Stellar accretion; Hertzsprung Russell diagram; Emission line stars |
Dates: |
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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/P005527/1 STFC (Science and Technology Facilities Council) ST/L000628/1 STFC (Science and Technology Facilities Council) ST/T000287/1 STFC (Science and Technology Facilities Council) ST/P00041X/1 EU - European Union 676036 |
Depositing User: | Symplectic Publications |
Date Deposited: | 25 Apr 2022 10:07 |
Last Modified: | 25 Jun 2023 22:57 |
Status: | Published |
Publisher: | IOP Publishing |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:186039 |