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T Tauri stars in the SuperWASP and NSVS surveys II. Spectral modelling

Hambálek, L’; Krushevska, V; Pribulla, T; Vaňko, M; Budaj, J; Fiorucci, M; Garai, Z; Guenther, E; Komžík, R; Kundra, E; Munari, U; Smalley, B

Authors

L’ Hambálek

V Krushevska

T Pribulla

M Vaňko

J Budaj

M Fiorucci

Z Garai

E Guenther

R Komžík

E Kundra

U Munari



Abstract

We present results from long-term spectroscopic monitoring of 21 T-Tauri stars located in the Taurus–Auriga star-forming region (SFR). We combine medium and high-dispersion Echelle spectroscopy obtained at the Stará Lesná, Skalnaté Pleso (both in Slovakia), and Tautenburg (Germany) observatories with low-resolution flux-calibrated spectra from Asiago (Italy) observatory all taken between 2015 and 2018. We extend the coverage by additional medium-resolution spectra from Stará Lesná obtained in 2022. In the previous paper, we measured photometric periods of these targets in a range of 0.7–3.1 d, which could be due to the rotation of a spotted surface or binarity. Here, we use the broadening-function technique to determine the radial and projected rotational velocities to reveal any close binary companion. Our analysis concludes that no such companion is present with an orbital period equal to the photometric period. We focus our analysis primarily on determining atmospheric parameters such as surface gravity log g, effective temperature Teff, and metallicity [Fe/H]. Additionally, we measure the equivalent width of H α, Li i, and interstellar Na i lines. We also investigate the effect of possible reddening on individual targets and construct the HR diagram of our sample. Using pre-main-sequence evolutionary models, we determine the age of our targets. This analysis hints at ages younger than 50 Myr with mean age 5 ± 3 Myr, masses between 0.75 and 2.10 M⊙, and minimum radii in the range 0.60–3.17 R⊙. Altogether, the results are consistent with expected young stars with larger radii than those of main-sequence stars.

Journal Article Type Article
Acceptance Date Jul 13, 2023
Online Publication Date Jul 17, 2023
Publication Date Jul 24, 2023
Deposit Date Aug 7, 2023
Publicly Available Date Aug 7, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 524
Issue 3
Pages 3582-3595
DOI https://doi.org/10.1093/mnras/stad2133
Keywords Space and Planetary Science, Astronomy and Astrophysics

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