Skip to main content

Special Notice #400: BF Cyg observations requested

March 13, 2015: Dr. George Wallerstein (University of Washington) informed us that the symbiotic variable BF Cygni has brightened considerably over the past few weeks, and he is currently obtaining spectroscopy of it.  

He is interested in correlating the spectral evolution with the optical light curve, and has asked for more coverage by the AAVSO community. Both visual and CCD (filtered, preferably V) observations are useful and are requested, particularly by observers who have already been observing BF Cyg recently (so that we can establish your visual zero-point).

Especially if BF Cygni is one of your usual targets, please keep it in your observing program and observe it every few days during the current episode and throughout the 2015 observing season.

Observations submitted to the AAVSO International Database include:
2014 Nov. 20.67361 UT, 10.8 (VGK, G. Vithoulkas, Athens, Greece);
21.02153, 10.8 (SLH, L. Shotter, Uniontown, PA);
22.02000, 11.0 (SFS, S. Schiff, Middleburg, VA);
23.75069, 10.7 (SJZ, J. Speil, Walbrzych, Poland);
24.98264, 10.6 (KRAA, R. King, Gainsville, VA);
25.00000, 10.8 (BRJ, J. Bortle, Stormville, NY);
26.79790, 10.9 (GZN, F. Glez-Herrera, Ferrol, Spain);
29.96786, 10.492 V +/-0.008 (DKS, S. Dvorak, Clermont, FL);
Dec. 04.76389, 10.7 (Speil);
08.71250, 10.8 (Speil);
12.81000, 10.3 (TPS, I. Tepliczky, Budapest, Hungary);
12.96828, 10.328 V +/-0.008 (Dvorak);
13.79380, 10.1 (ACO, C. Allen, Farjestaden, Sweden);
14.80490, 10.8 (Glez-Herrera);
17.96759, 10.15 V +/-0.01 (Dvorak);
17.97200, 10.5 (Schiff);
20.75600, 10.01 TG +/-0.05 (MEV, E. Morelle, Lauwin-Planque, France);
20.80690, 10.7 (Glez-Herrera);
23.68960, 10.4 (Allen);
23.70000, 10.6 (PPS, S. Papp, Kecskemet, Hungary);
26.67057, 10.028 V +/-0.064 (LMJ, M. Luostarinen, Pikkala, Finland);
26.69000, 10.4 (Papp);
26.95486, 10.2 (ONJ, J. O'Neill, Topsfield, MA);
28.72290, 10.5 (Allen);
29.74300, 9.91 TG +/-0.05 (Morelle);
30.77780, 10.6 (Glez-Herrera);
2015 Jan. 04.68000, 10.1 (Papp);
04.71740, 10.4 (Allen);
05.71180, 10.1 (Allen);
06.70000, 10.2 (HCS, C. Hadhazi, Hajduhadhaz, Hungary);
Feb. 03.47168, 9.519 V +/-0.007 (Dvorak);
06.47114, 9.495 V +/-0.007 (Dvorak);
07.72780, 9.6 (BHS, H. Bengtsson, Hisings Backa, Sweden);
11.47065, 9.532 V +/-0.008 (Dvorak);
15.15900, 9.5 (DPV, P. Dubovsky, Kolonica, Slovakia);
15.47218, 9.413 V +/-0.007 (Dvorak);
22.42092, 9.52 V +/-0.08 (Dvorak);
27.18750, 9.5 (KWO, W. Kriebel, Schierling/Walkenstetten, Germany);
Mar. 09.38666, 9.47 V +/-0.01 (Dvorak);
13.35417, 9.6 (O'Neill);

Coordinates: R.A. 19 23 53.51  Dec. +29 40 29.2 (2000.0)

Charts with sequence for BF Cyg may be created using the AAVSO Variable Star Plotter (VSP).

Please submit your observations to the AAVSO using the name BF CYG.

This AAVSO Special Notice was compiled by Matthew R. Templeton and Elizabeth O. Waagen.

----------------------------------
SUBMIT OBSERVATIONS TO THE AAVSO

Information on submitting observations to the AAVSO may be found at:
http://www.aavso.org/webobs

SPECIAL NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

A Special Notice archive is available at the following URL:
http://www.aavso.org/special-notice-archive

Subscribing and Unsubscribing may be done at the following URL:
http://www.aavso.org/observation-notification#specialnotices

-------------------------------------------------

Please support the AAVSO and its mission -- Join or donate today:
http://www.aavso.org/apps/donate/

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484