Masses and Implications for Ages of Low-Mass Pre-Main Sequence Stars in Taurus and Ophiuchus - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2019

Masses and Implications for Ages of Low-Mass Pre-Main Sequence Stars in Taurus and Ophiuchus

S. Guilloteau
Tracy L. Beck
  • Fonction : Auteur
E. Chapillon
  • Fonction : Auteur
Anne Dutrey
  • Fonction : Auteur
E. Di Folco
  • Fonction : Auteur
Gregory A. Feiden
  • Fonction : Auteur
N. Grosso
L. Prato
  • Fonction : Auteur
Gail. H. Schaefer
  • Fonction : Auteur

Résumé

The accuracy of masses of pre-main sequence (PMS) stars derived from their locations on the Hertzsprung-Russell Diagram (HRD) can be tested by comparison with accurate and precise masses determined independently. We present 29 single stars in the Taurus star-forming region (SFR) and 3 in the Ophiuchus SFR with masses measured dynamically to a precision of at least $10 \%$. Our results include 9 updated mass determinations and 3 that have not had their dynamical masses published before. This list of stars with fundamental, dynamical masses, M$_{dyn}$, is drawn from a larger list of 39 targets in the Taurus SFR and 6 in the Ophiuchus SFR. Placing the stars with accurate and precise dynamical masses on HRDs that do not include internal magnetic fields underestimates the mass compared to M$_{dyn}$ by about $30 \%$. Placing them on an HRD that does include magnetic fields yields mass estimates in much better agreement with M$_{dyn}$, with an average difference between M$_{dyn}$ and the estimated track mass of $0.01\pm0.02$~\msun. The ages of the stars, 3--10 MY on tracks that include magnetic fields, is older than the 1--3 MY indicated by the non-magnetic models. The older ages of T Tauri stars predicted by the magnetic models increase the time available for evolution of their disks and formation of the giant gas exoplanets. The agreement between our M$_{dyn}$ values and the masses on the magnetic field tracks provides indirect support for these older ages.

Dates et versions

hal-02282440 , version 1 (10-09-2019)

Identifiants

Citer

Michal Simon, S. Guilloteau, Tracy L. Beck, E. Chapillon, Anne Dutrey, et al.. Masses and Implications for Ages of Low-Mass Pre-Main Sequence Stars in Taurus and Ophiuchus. The Astrophysical Journal, 2019, 884 (1), pp.id. 42. ⟨10.3847/1538-4357/ab3e3b⟩. ⟨hal-02282440⟩
65 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More