AAVSO: American Association of Variable Star Observers

Proposal #87

Proposer (4593) David Dowhos (davedowh@tbaytel.net) obscode: DDJ
Assigned To(3663) Dirk Terrell
Date SubmittedSept. 13, 2018

Requester: David J Dowhos
Membership Status: Active
Obscode: DDJ
email: davedowh@tbaytel.net

I am interested in participating in Monitoring of LPVs for Maser Study as described in AAVSO'sAlert Notice 645 which states July 31, 2018: Michael Stroh (Ph.D. candidate, University of New Mexico) requests AAVSO assistance in monitoring 20 LPVs in support of a VLA campaign studying SiO masers. AAVSO monitoring begins now and goes through October 2019.

Stroh writes: "We have an approved Karl G. Jansky Very Large Array (VLA) monitoring campaign beginning in October of 2018 lasting for one year 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 will guide our interpretation of the radio observations.

"We selected our stars based on previous SiO observations of these sources but we also tried to select some that already had a history of good AAVSO coverage. These stars were previously observed as part of the Bulge Asymmetries and Dynamical Evolution survey and more information can be found at www.phys.unm.edu/~baade/index.html. All stars are also in the International Variable Star Index [VSX].

My data would be of great use for this study of SiO maser lines for educational research purposes.

My proposal includes the observing of 12 LPV's using the Stein telescope in New Mexico ( 32:54:43.7N / 105:31:28.7 W ) using the photometric V filter in order to process the digital images via VPHOT.

Images to be uploaded to VPHOT

Exposure time for each image to be 30 seconds

Imaging to begin in October 2018 and end Nov 15 2018

Images to be taken of each star of the 12 stars approximately every 2 weeks for a total of 4 sessions or 48 total images.

Photometric V filter to be used on all images.

Each Star Chart has comparison stars for all 12 targets.

Epoch 2000 is used for all target positions

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
SY Mon 6.625372 -1.39528 14.6–7.0 No
V349 Vul 19.519575 23.50931 15.2–11.4 No
RT Aql 19.633778 11.72172 14.5–7.6 No
SX Cyg 20.259314 31.07225 15.2–8.2 No
AU Cyg 20.309103 34.38903 15.3–9.5 No
V1655 Cyg 20.423339 38.70989 14.8–12.0 No
V1659 Cyg 20.484867 39.71272 15.4–12.1 No
NSVS J2041274+511326 20.690961 51.22497 13.3–11.0 No
DR Cyg 20.728058 38.16558 15.5–9.3 No
V750 Cyg 20.822547 50.53092 16.4–11.2 No
W Cep 22.607656 58.42611 8.05–7.02 No
AL Cep 22.821358 58.58531 14.5–10.9 No
VX Cep 22.847069 64.25131 15.5–11.4 No


(2911) Michael Nicholas — Sept. 24, 2018, 7:01 p.m.

Committed to NM - Mike

(2911) Michael Nicholas — Dec. 4, 2018, 10:22 p.m.

Dave has requested a change to a seven day cadence.

(2911) Michael Nicholas — Dec. 4, 2018, 11:04 p.m.

User requested adding a B filter observation to W Cep

Comments on this proposal are closed.