AAVSO: American Association of Variable Star Observers

Proposal #253

Proposer (42873) Dan Glomski (daglom3109@gmail.com) obscode: GDAG
Assigned To(3663) Dirk Terrell
Date SubmittedJan. 23, 2022

My name is Dan Glomski (observer code GDAG) I propose to observe and submit observations of the VY Scl type cataclysmic variable V704 And, discovered in 1999 (1), with the observations taken from the Faint Star Monitor's SRO station.

Observations of this star and 14 other VY Scl CVs were recently requested in Alert Notice 754 (2). I was able to obtain at least two V-band observations of V704 And during fall of 2021, but since then cold, cloudy weather (typical of Michigan winters) has prevented me from obtaining further data. In addition, the star apparently entered a low state in December 2021, though this has not been confirmed (3). Regardless, the current faintness (mv ~ 17.5) places it outside the range of my personal equipment and those of the Bright Star Monitor telescopes. Though some observations of V704 And have been submitted by others (4), recent temporal coverage has diminished somewhat and some magnitude estimates appear to be in error.

I would like to take at least two and up to four sets of calibrated V-band images of V704 And per week as telescope time and weather permit, starting immediately and running through approximately March 1 (very rough date when star altitude approaches 30 degrees and declining at the end of twilight). Each set consists of approximately 15 1-minute images; I would submit data either as individual estimates (from an image stack) or as a short time series, depending on S/N ratio of the individual images. Should the star return to high state (and clouds break), I will also submit observations with my own equipment (regardless of whether this proposal is accepted).

1 https://arxiv.org/pdf/1810.01472.pdf
2 https://www.aavso.org/aavso-alert-notice-754
3 https://www.aavso.org/vy-scl-stars-too-campaign
4 https://app.aavso.org/webobs/results/?star=000-BDC-688&num_results=200

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
V704 And 23.749308 43.52286 19.5–12.6 TMO61 Aug. 8, 2022 No


(3663) Dirk Terrell — Jan. 25, 2022, 8:38 p.m.

Hi Dan,

The LCG shows coverage of this star and confirms the drop to minimum:


We're not averse to observing this system, but would like to confirm that you still want to do so given the data shown above.

(42873) Dan Glomski — Jan. 26, 2022, 2:27 a.m.

Hello Dirk,

Thank you for the response.

Yes, I would like to observe V704 And - if there is astrophysical value in monitoring its return to high state, in addition to watching for any unusual behavior. (The literature also refers to an intermediate state for this star.)

Some personal reasons for choosing this star: it's relatively easy to locate with a non-Go To mount (which I have), and should the system return to high state within the next month or two, I would love to compare data from the SRO scope to that from my own modest system - whenever skies allow here. As a recent graduate of Ken Menzies's VPhot CHOICE course, I have been unable to use that software over two months. Given that V704 And has some coverage, I don't need to observe the star twice a week; I would be happy with a few image sets between now and early March - whatever time the SRO has to spare - just to keep my own skills up while contributing some data and waiting for Michigan's dismal winter skies to finally break.

I appreciate the consideration.

Best Wishes,

(3663) Dirk Terrell — Jan. 26, 2022, 4 a.m.

Ok, we will put it in the queue. Twice a week shouldn't be too difficult and would give good coverage for variability beyond just the broad rise to a high state, as you say. Right now SRO is down (being moved) and Arne is going to see if there are any issues with the other big telescopes.

(42873) Dan Glomski — Jan. 26, 2022, 12:17 p.m.

Thank you Dirk! Greatly appreciated. Will wait to hear from you or Arne regarding the status of the other scopes.


(4726) Kenneth Menzies — Feb. 9, 2022, 2:47 p.m.

Committed to mpo61. Check exposures. Long and short exposure sets included.

(42873) Dan Glomski — Feb. 12, 2022, 1:31 p.m.

Just in case this wasn't seen: https://www.aavso.org/aavso-alert-notice-769
Great timing!

Dan (GDAG)

Comments on this proposal are closed.