discov_num |
notes |
refcode |
A 2592 |
AB: Malkov et al. (2012) derive dynamical, photometric, and |
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|
spectroscopic masses 20.39 +/- 12.95, 4.49, 1.13 Msun, respectively. |
Mlk2012 |
|
AB + TOK 53Ba,Bb: This is the triple system HIP 84430. We computed |
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|
the first orbit of the secondary subsystem Ba,Bb which was discovered |
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|
at SOAR in 2009 and has just completed one full revolution since. Its |
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|
separation is always close to the diffraction limit. Adopting a mass |
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|
sum of 2.6 Msun for Ba,Bb, the resulting dynamical parallax is |
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|
7.6+/-1.5mas, while the HIP2 parallax is 4.9+/-0.9mas. The latest |
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|
orbit of the outer pair A 2592 AB published in Tokovinin et al. (2014) |
[Tok2014 |
|
does not account for the fact that the speckle measurements at SOAR |
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|
refer to A,Ba and not to AB. Here we give a more accurate solution |
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|
that uses the positions of AB computed from the measures of A,Ba under |
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|
the assumption that Ba and Bb have equal masses. After this correction |
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|
and orbit adjustment, the weighted residuals are 4.3mas in separation |
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|
and 1.3deg in angle. Interestingly, there were a considerable number |
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|
of speckle-interferometry measures of this pair obtained in the 1980's |
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|
and 1990's at 4-m telescopes, but none of them recognized the |
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|
subsystem Ba,Bb, despite its small dm. |
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|
Ignoring the multiplicity, the spectroscopic survey of Guillout et al. |
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|
(2009 A&A 504, 829) determined a moderate axial rotation V sin i = |
|
|
10.8km/s and detected the lithium line of 52.8mA equivalent width |
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|
which, together with the X-ray detection by ROSAT (RasTyc 1715-0948), |
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|
normally indicates youth. These authors do not mention this star in |
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|
particular, but discuss a group of active lithium-rich giants in their |
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|
sample, to which this system apparently belongs. Even with the larger |
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|
dynamical parallax (instead of the HIP2 parallax), all three resolved |
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|
components of HIP 84430 are located above the main sequence in the |
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|
color-magnitude diagram. This multiple system is peculiar and merits |
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|
further study. |
Tok2015c |
refcode |
metd |
author |
reference |
Mlk2012 |
not - |
Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. |
2012A&A...546A..69M |
Mlk2012 |
|
A&A 546, A69, 2012 |
|
Tok2015c |
orb+j |
Tokovinin, A., Mason, B.D., Hartkopf, W.I., Mendez, R.A., & Horch, E.P. |
2015AJ....150...50T |
Tok2015c |
+St |
AJ 150, 50, 2015 (some measures corrected in Tok2017b) |
2017AJ....154..110T |
Tok2021b |
orb |
Tokovinin, A. |
2021AJ....161..144T |
Tok2021b |
|
AJ 161, 144, 2021 |
|