| discov_num |
notes |
refcode |
| USN 2 |
LHS 3236 = WD1639+153 = NLTT 43383. |
|
|
Harris et al. (2013) derive a distance of 30.86 +/- 0.25pc (parallax |
|
|
31.67 +/- 0.25mas), which is larger than the spectroscopically- |
|
|
determined distance of 21-22pc and yields a nearly normal mass for |
|
|
this pair. LHS 3236 is a double-degenerate binary, which eliminates |
|
|
the possibility of a substellar companion. Temperature of both |
|
|
components are 7700 +/- 60K. Astrometric analysis favors a DA+DA pair, |
|
|
with mass sum 1.84 +/- 0.03 Msun, while spectroscopic analysis |
|
|
suggests DA + DC, with a combined mass of 1.68 +/- 0.05 Msun. Age of |
|
|
the system is about 3.3 Gyr. |
USN2013b |
|
The Harris et al. orbit finds a photocentric semi-major axis of 4.37 |
|
|
+/- 0.25 mas. Matches to 2008 and 2010 Keck AO observations yield |
|
|
dilution factors of 23.0 and 22.2, respectively. The mean of these two |
|
|
dilution factors gives the semimajor axis value of 98.76 +/- 5.65 mas |
|
|
listed in the Sixth Orbit Catalog. |
|
| refcode |
metd |
author |
reference |
| USN2013b |
A+ j |
Harris, H.C., Dahn, C.C., Dupuy, T.J., Canzian, B., Guetter, H.H., Hartkopf, W.I., |
2013ApJ...779...21H |
| USN2013b |
+X |
Ireland, M.J., Leggett, S.K., Levine, S.E., Liu, M.C., Luginbuhl, C.B., |
|
| USN2013b |
+Z |
Monet, A.K.B., Stone, R.C., Subasavage, J.P., Tilleman, T., & Walker, R.L. |
|
| USN2013b |
+orb |
ApJ 779, 21, 2013 |
|
