|Proposer||(18541) Joshua Pepper (email@example.com) obscode: PJOA|
|Assigned To||(3865) Elizabeth Waagen|
|Date Submitted||July 2, 2019|
We propose AAVSOnet observations of the bright variable star Zeta Andromedae. We are planning observations of the star to directly measure differential rotation on the star’s surface by resolving individual spot patterns on the disk of the star interferometrically with the CHARA observatory, which has never been done before. Those observations are being planned to overlap with the time that the star will be observed by the NASA TESS mission from 7 Oct 2019 through 2 Nov 2019. In order to obtain long time-baseline measurements of the spot evolution of the star, we are also conducting ground-based photometric observations of the star from Fairborn Observatory in Arizona with the APT telescopes for several months before and after the TESS and CHARA observations. Although the TESS photometry will provide much higher precision, it is limited to the 27-day duration of the TESS sectors, less than 2 rotational cycles, which is why the ground-based photometry will be so useful. These observations will clarify whether the spots evolution timescale is shorter than expected, which will add reliability to the interferometric results. However, our monitoring facilities will be offline in July and August 2019 for the annual monsoon season, and we are looking for other facilities to conduct monitoring.
|Target||RA (H.HH)||Dec (D.DD)||Magnitude||Telescope||Observation Frequency||Expiration Date||Proprietary Term|
<These 3 comps should be ok, given that you need to stack anyway to remove scintillation from zet And. The redder comps would be ok for Ic , and match the K1 spectral type of zet And reasonably well. Also, if you offset slightly to the west, you pick up NSV 258, which only has a possible 0.02mag P-P variation at 6th magnitude. So: I would not worry too much about the photometry.
If accepted, I would do the following:
B 6 seconds x 10
V 3 seconds x 20
I 1 second x 60
and use both BSM_NM and BSM_NH2. If nightly cadence, that might mean 2x/night results, which might be ok for Josh. Or better, do two observations per site per night.
Once accepted, Plan will perform two observations per night (HourAngle=-2 -1, HourAngle=1 2) with Priority set to 70 - Mike
Project archived per request.
We failed to notice that it should have been done 11/2019!
Comments on this proposal are closed.