Astronomické fórum

Vazeni pozorovatele, venujte prosim svou pozornost symbioticke hvezd BF Cygni, ktera je v programu MEDUZY. Podle zpravy z VSNETu vzplanula a to o 1.5 - 2 mag nad svou klidovou jasnost.

Svetelnou krivku MEDUZY (jeste bez vzplanuti) naleznete zde
http://var.astro.cz/cgi-bin/brat/light- ... F&size=0.8

S pozdravem
Lubos Brat



VSNET-ALERT ----------------------------------------------------------------------------
According to Stanislaw Swierczynski and M. J. Gainsford
(BAA-VSS alert), the symbiotic variable BF Cyg has undergone
an outburst. The rise should have taken less than two weeks;
reporting (if exist) observations between July 29 and August 15
are welcomed. As we have seen in Z And, rising of symbiotic
variables are much more quicker than has been generally supposed.
Frequent observations (once per night as in DNe) are recommended.

YYYYMMDD(UT) mag observer
20050613.581 114 (Tomohito Ohshima)
20050625.533 116 (Tomohito Ohshima)
20050717.569 117 (Masashi Nakatani)
20050728.597 117 (Masashi Nakatani)
20050730.660 126 (Tomohito Ohshima)
20050805.572 117 (Masashi Nakatani)
20050806.521 117 (Masashi Nakatani)
20050812.044 119: (Marian Legutko)
20050829.544 117 (Masashi Nakatani)
20050830.849 117 (Marian Legutko)
20050901.853 119 (Marian Legutko)
20050912.533 117 (Masashi Nakatani)
20050928.540 117 (Masashi Nakatani)
20050929.541 117 (Masashi Nakatani)
20051007.867 125 (Stanislaw Swierczynski)
20051016.526 117 (Masashi Nakatani)
20051028.769 129 (Stanislaw Swierczynski)
20051030.512 117 (Masashi Nakatani)
20051108.540 117 (Masashi Nakatani)
20051110.528 117 (Masashi Nakatani)
20051117.731 130 (Stanislaw Swierczynski)
20051219.682 128 (Stanislaw Swierczynski)
20060703.909 116 (Marian Legutko)
20060728.901 116 (Marian Legutko)
20060729.015 120 (Stanislaw Swierczynski)
20060815.956 103 (Stanislaw Swierczynski)
20060817.903 103 (M. J. Gainsford)

Zde je vyhledávací mapka pro vizuální pozorovatele:
ftp://astro.sci.muni.cz/meduza/finding- ... /bfcyg.pdf

a její náhled (gif):
http://var.astro.cz/meduza/mapky/small/bfcyg_m.gif

Ještě pár vět z VSNETu....


The following description by Munari et al. (CBET 596)
"It took a whole century for BF Cyg to return toward quiescence
following the outburst that peaked at B = 9.7 in 1894 ...
The last time that BF Cyg was seen this bright in the blue was
around 1925, during its decline from the 1898 eruption"
might be slightly misleading. BF Cyg has not been on monotonous
decline from the 1898 outburst, but experienced symbiotic
outbursts. The most recent one was around 1989-1990, reaching
mv=10. The early 1989 rise was quite rapid (as in the present
outburst), preceded by smaller brightening (notably in 1986 and
1987).

See e.g.
http://www.kusastro.kyoto-u.ac.jp/vsnet ... CYGBF.html

http://www.kusastro.kyoto-u.ac.jp/vsnet ... CYGBF.html

The object has been calm since then.

Regards,
Taichi Kato