| discov_num |
notes |
refcode |
| CHR 74 |
A well-known speckle binary whose first interferometric observations |
|
|
date from the CHARA speckle program in the mid-1980's, this object |
|
|
went unobserved from 1996 until the present work. The new data suggest |
|
|
that nearly half an orbit has been completed since the first speckle |
|
|
observation. The primary is probably close to an A0V star, and with a |
|
|
magnitude difference of perhaps 2-2.5, we estimate that the secondary |
|
|
is an F2V star. This would suggest a mass sum in the range 4-5 Msun, |
|
|
which is lower than what is implied by the value of P and a we derive, |
|
|
together with the Hipparcos parallax of 5.04 +/- 0.39 mas. We expect |
|
|
that the next decade will provide an opportunity to improve upon the |
|
|
orbit presented here since the separation will be above 0.1 arcsec and |
|
|
the position angle is expected to cover about 30deg. We encourage |
|
|
other observers to put this object back on their observing lists for |
|
|
the next few years. |
Hor2015b |
