Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.2378t&link_type=abstract
The Astronomical Journal, Volume 127, Issue 4, pp. 2378-2381.
Astronomy and Astrophysics
Astronomy
12
Astrometry, Stars: Binaries: Visual, Stars: Individual: Constellation Name: T Tauri, Stars: Pre-Main-Sequence
Scientific paper
On the basis of 17 astrometric radio and infrared position measurements almost uniformly covering an arc of 270°, an improved orbit with a period of 33 years and semimajor axis of 0.104" (14.6 AU) for the T Tau Ba-Bb pair (also known as T Tau Sa-Sb) is calculated. A total system mass of 2.82+/-0.74 Msolar is obtained, leading to a first direct mass estimate for T Tau Ba, which is a known infrared companion (IRC), on the order of 2.2-2.3 Msolar. This estimate supports the model in which the IRC may be a young star coeval with T Tau A that suffers stronger extinction because it is experiencing an episode of enhanced accretion, possibly tied to its orbital phase. The obtained orbit is clearly distinguishable from the previous solution and therefore allows verification of the behavior of the system in the near future.
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