Resumo

VILLA, A. M.; TRINIDAD, M. A.; FUENTE, E. de la  e  RODRIGUEZ-ESNARD, T.. Proper Motions of L1551 IRS 5 Binary System Using 7 mm VLA Observations. Rev. mex. astron. astrofis [online]. 2017, vol.53, n.2, 00025.  Epub 21-Out-2019. ISSN 0185-1101.

We analyzed high angular resolution observations of the Very Large Array archive at a wavelength of 7 mm made for the L1551 IRS 5 binary system. Six sets of observations, five with the A configuration and one with the B configuration, were used, covering a time span of about 15 years. With these multi-epoch data, we estimated the absolute and relative proper motions of the binary system, which are about 25.1 mas yr−1 (≈ 16.7 km s−1 considering a distance of 140 pc) and 4.2 mas yr−1, respectively. Finally, based on the relative proper motion, we estimated a total mass for the L1551 IRS 5 binary system of 1.7 M⊙ and an orbital period of 246 years.

Palavras-chave : astrometry; binaries: general; circumstellar matter; ISM: individual (L1551 IRS 5); stars: formation.

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