| discov_num |
notes |
refcode |
| JNN 79 |
The two targets 2MASS J12173945-6409418 and J12174012-6409389 are |
|
|
physically bound, as shown by common proper motion analysis. However, |
|
|
this means that one of the targets likely has an error in the Riaz et |
|
|
al. (2006) spectral type determination, since J12174012-6409389 is |
Ria2006 |
|
classified as M2 but is fainter than J12174012-6409389, which is |
|
|
classified as M3.5. The fact that J12174012-6409389 is fainter holds |
|
|
true both in 2MASS and in the AstraLux images. Both components are |
|
|
resolved as close binaries with AstraLux, so we consider it a strong |
|
|
candidate for a quadruple system, with J12173945-6409418A as the |
|
|
primary. Concerning which spectral type determination is incorrect, we |
|
|
consider that it is more likely that J12174012-6409389 is mis- |
|
|
classified, as the flux ratio to the close companion is closer to |
|
|
unity than in the J12174012-6409389 case. We thus set the spectral |
|
|
type of J12174012-6409389A to M3+/-1, and determine the other spectral |
|
|
types on the basis of flux ratios. Component Bb is not visible in the |
|
|
i' data, but becomes visible in z' thanks to the higher Strehl ratio |
|
|
and intrinsic brightness of the component. A fifth object is visible |
|
|
in the field, but its color reveals it to be a likely background star. |
Jnn2012 |
| refcode |
metd |
author |
reference |
| Jnn2012 |
Cl j |
Janson, M., Hormuth, F., Bergfors, C., Brandner, W., Hippler, S., Daemgen, S., |
2012ApJ...754...44J |
| Jnn2012 |
+E2 |
Kudryavtseva, N., Schmalzl, E., Schnupp, C., & Henning, T. |
|
| Jnn2012 |
|
ApJ 754, 44, 2012 (some recalibrated measures published in Jnn2014b) |
2014ApJS..214...17J |
| Ria2006 |
not - |
Riaz, B., Gizis, J., & Harvin, J. |
2006AJ....132..866R |
| Ria2006 |
|
AJ 132, 866, 2006 |
|
