AAVSO: American Association of Variable Star Observers

Proposal #127

Proposer (4593) David Dowhos (davedowh@tbaytel.net) obscode: DDJ
Assigned To(3663) Dirk Terrell
Date SubmittedJan. 2, 2020

Proposer: David J Dowhos
Obscode: DDJ
email: davedowh@tbaytel.net

Date of submission: Jan 2, 2020

I am interested in participating in the extended study of Monitoring of LPVs for Maser Study as requested by D .Stroh.
I participated in the first year of this study and contributed over 430 observations using AAVSO's BSM telescopes and VPhot during that time period. I would like to continue to do this until October of 2020.

My data would be of great value in helping to conclude the data for this study.
My proposal would require the use of the BSM telescopes which I already have experience with using the photometric V and B filters in order to process the digital images via VPhot.

Target locations are given using Epoch 2000.
Concerning tis extension, Dr. Stroh writes: "Our approved Karl G. Jansky Very Large Array (VLA) monitoring campaign [that began] in October of 2018 is continuing through October 2020 and observations from AAVSO would be invaluable. In particular, we believe that the strengths of the SiO maser lines we observe at 43 GHz in the radio are correlated with the phase of the stars in our sample and may allow us to probe the density in the stellar envelopes. Our VLA observations will likely occur about once every 3 weeks, thus AAVSO sampling of targets ranging from 2 to 4 weeks through October 2020] will guide our interpretation of the radio observations."

However, the usual cadence for LPVs is one observation every 10 days, and this cadence is requested by the AAVSO. It is asked that more frequent observations not be made.

Stroh continues: "We prefer Johnson V photometry for all stars to standardize our measurements. If this is not possible, redder filters are preferred (if possible), and are considered a bonus if performed in addition to observations in V since these are very red stars." Visual observations are welcomed and encouraged.

Please see Alert Notice 645 for more details on the campaign.

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
TY CAS 0.616506 63.13381 19.0–10.1 BSM_NH2 July 22, 2020 1 Year
FI Per 3.915764 48.60053 17.8–14.0 BSM_NH2 July 22, 2020 1 Year
SY MON 6.625372 -1.39528 14.6–7.0 BSM_NH2 July 22, 2020 1 Year
FX MON 6.751556 9.03847 18.0–11.0 BSM_NH2 July 22, 2020 1 Year
NSVS 12572573 6.754153 -2.44308 17.0–13.5 BSM_NH2 July 22, 2020 1 Year
V349 VUL 19.519575 23.50931 15.2–11.4 BSM_NH2 July 22, 2020 1 Year
RT AQL 19.633778 11.72172 14.5–7.6 BSM_NH2 July 22, 2020 1 Year
V353 VUL 19.822794 22.62772 15.5–13.0 BSM_NH2 July 22, 2020 1 Year
AU CYG 20.309103 34.38903 15.3–9.5 BSM_NH2 July 22, 2020 1 Year
V1655 CYG 20.423339 38.70989 14.8–12.0 BSM_NH2 July 22, 2020 1 Year
J2041274+51132 20.690958 51.22497 13.3–11.0 BSM_NH2 July 22, 2020 1 Year
DR CYG 20.728058 38.16558 15.5–9.3 BSM_NH2 July 22, 2020 1 Year
V750 CYG 20.822547 50.53092 16.4–11.2 BSM_NH2 July 22, 2020 1 Year
SX CYG 20.259314 31.07225 15.2–8.2 BSM_NH2 July 22, 2020 1 Year
W CEP 22.607656 58.42611 7.02–8.5 BSM_NH2 July 22, 2020 1 Year
AL CEP 22.821358 58.58531 14.5–10.9 BSM_NH2 July 22, 2020 1 Year
VX CEP 22.847069 64.25131 15.0–11.4 BSM_NH2 July 22, 2020 1 Year
V CAS 23.194644 59.69972 13.4–6.9 BSM_NH2 July 22, 2020 1 Year
V850 CAS 23.627711 58.84617 15.2–12.9 BSM_NH2 July 22, 2020 1 Year
V657 CAS 23.868033 61.80347 19.0–13.9 BSM_NH2 July 22, 2020 1 Year


(3663) Dirk Terrell — Jan. 7, 2020, 6:40 p.m.

From Arne:

Elizabeth says that she was mostly thinking of visual observers, and trying to keep from saturating CCD observers since there are so many targets. I'd probably just re-use the prior project's rtml/csv with whatever cadence Dowhos was using last year, and add V_Cas.

On Thu, Jan 2, 2020 at 5:08 PM Arne Henden <arne@aavso.org> wrote:

We did this proposal last year without too much difficulty. However, I question the Alert Notice #687 statement about observing every 10 days. I've got an email in with Elizabeth to see if this is a mistake, as I doubt the AAVSO would restrict CCD observers to such a coarse cadence.

That being said, I don't see any equipment restrictions. In fact, with the E180 at BSM_Hamren and probably at NH2 and NM before the campaign is over, we should be able to handle the fainter LPVs in this program.

You might ask the proposer if he intends to submit the data to the AID after the requested 1-year proprietary period ends. Because of this requested proprietary period, I'd suggest leaving any existing plan for any of these targets in place, and just add David's additional monitoring.

(4726) Kenneth Menzies — Jan. 24, 2020, 12:27 p.m.

Plan created and committed to BSM_NM. NM down at moment. David you need to find an alias in VSX for J2041274+51132.

(4726) Kenneth Menzies — Jan. 24, 2020, 3:15 p.m.

Plan created and committed to NH2 and Hamren with adjusted exposure and binning.

Comments on this proposal are closed.