# Dynamical Masses of Low Mass Stars in the Taurus and Ophiuchus Star Forming Regions

3 AMOR 2017
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
Abstract : We report new dynamical masses for 5 pre-main sequence (PMS) stars in the L1495 region of the Taurus star-forming region (SFR) and 6 in the L1688 region of the Ophiuchus SFR. Since these regions have VLBA parallaxes these are absolute measurements of the stars' masses and are independent of their effective temperatures and luminosities. Seven of the stars have masses $<0.6$ solar masses, thus providing data in a mass range with little data, and of these, 6 are measured to precision $< 5 \%$. We find 8 stars with masses in the range 0.09 to 1.1 solar mass that agree well with the current generation of PMS evolutionary models. The ages of the stars we measured in the Taurus SFR are in the range 1-3 MY, and $<1$ MY for those in L1688. We also measured the dynamical masses of 14 stars in the ALMA archival data for Akeson~\&~Jensen's Cycle 0 project on binaries in the Taurus SFR. We find that the masses of 7 of the targets are so large that they cannot be reconciled with reported values of their luminosity and effective temperature. We suggest that these targets are themselves binaries or triples.
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Type de document :
Article dans une revue
Astronomy and Astrophysics - A&A, EDP Sciences, 2017, pp.submitted 2017 A&A

https://hal.archives-ouvertes.fr/hal-01538699
Contributeur : Marie-Paule Pomies <>
Soumis le : mercredi 14 juin 2017 - 08:38:06
Dernière modification le : vendredi 16 juin 2017 - 01:10:14

### Citation

M. Simon, S. Guilloteau, E. Di Folco, Anne Dutrey, N. Grosso, et al.. Dynamical Masses of Low Mass Stars in the Taurus and Ophiuchus Star Forming Regions. Astronomy and Astrophysics - A&A, EDP Sciences, 2017, pp.submitted 2017 A&A. <hal-01538699>

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