AAVSO: American Association of Variable Star Observers

Proposal #299

Proposer (45802) Mikhail Ashchepkau (ashchepkau@gmail.com) obscode: AMIF
Assigned To(3663) Dirk Terrell
Date SubmittedDec. 11, 2022

Very specific (UGWZ+E+ZZ/GWLIB) cataclysmic variable EZ Lyn does not have reliable AAVSO data about one year; a lot of points give just "less than 14m" values. Last short serial oservation has been made at JD 2458955 and shown brightness 17.9v. Probable supercycle of EZ Lyn is 4 year, but this dwarf nova does not have superburst during 11 years. The presence of the small eclipse in the optical light curve was confirmed, but the contribution of the disk and intensities of emission lines are strongly varied, the double-humped orbital modulation in the light curve was found. Proposed 90-min timeserie photometry will refine period of accretion disc oscillations near probable outburst.

Field: there are 16 comparison stars 8.7-18.0 in the field of 20 min

Requested observation: V observation of EZ Lyn during 90 min with step 5-10 min, telescope BSM-NH2

Observer code: AMIF

Note: I am inexperiensed observer and kindly ask to send me images for photometry learning and training

Link: Period Bouncer Cataclysmic Variable EZ Lyn in Quiescence, https://iopscience.iop.org/article/10.3847/1538-4357/ac0e36

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
EZ Lyn 8.076170 51.06372 18.2–12.0 BSM_NH2 0 June 13, 2023 No


(3663) Dirk Terrell — Dec. 14, 2022, 8:04 p.m.

From Arne:

"...it would be interesting to see how deep a BSM system could go, and you might get lucky. What I think I'd recommend is one or two nights with BSM_NH2 for 2hrs with 3minute exposures for stacking. Then do a 3-hour time series with MPO61 and 3-minute exposures to get better data."

(4726) Kenneth Menzies — Dec. 15, 2022, 5:51 p.m.

Committed to NH and mpo61 for one night, 3 hours @ 180s

(45802) Mikhail Ashchepkau — Jan. 28, 2023, 3:31 p.m.

Please, if possible, continue observations with MPO each 1-3 months. Serial shooting of 60 x 180 sec in V band will help to check EZ Lyn behaviour well as its neighbor EA Linear 154606.

Comments on this proposal are closed.