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(vsnet-alert 236, 1995 Sep. 15, J. Bortle)
The Z And-type star 1848-19a FN Sgr is undergoing an outburst, as indicated by the following observations made by the undersigned:
date UT Mag
------- -----
FN Sgr Aug 14.1 13.0
Aug 20.1 12.9
Aug 29.1 12.9
Sep 3.1 12.9
Sep 12.1 12.4
Sep 15.1 11.8
This star last experienced an outburst in May/June 1994.
John E. Bortle (AAVSO)
(vsnet-alert 249, J. Bortle)
I also note that the Z And-type star 1848-19a FN Sgr, which recently began an outburst phase, has brightened further during October.
Sep. 28.1 UT 11.8 (RASNZ/AAVSO Sequence)
29.1 11.8
30.0 11.9
Oct. 1.0 11.9
3.1 11.8
10.1 11.5
12.1 11.5
13.0 11.5
14.0 11.5
John E. Bortle (AAVSO)
(from AAVSO NEWS FLASH No. 27)
FN SAGITTARII
The symbiotic star FN Sgr is fading from the outburst that began in the fall of 1995 (see AAVSO Alert Notice 215) as indicated by the following observations:
AAVSO Observer AAVSO Observer
UT Mag. Initials UT Mag. Initials
APR 18.3 11.8 BRJ APR 28.0 12.0 OB
APR 21.0 12.0 OB MAY 14.9 11.9 MLF
APR 22.0 12.0 OB MAY 24.4069 13.1 SQN
APR 23.0 12.0 OB MAY 30.101 <13.0 OB
APR 24.383 12.1 MRV MAY 30.2042 13.8 BRJ
APR 27.0 12.0 OB
(vsnet-alert 433, T. Kato)
Dear colleagues,
The symbiotic variable FN Sgr is showing a dramatical fading from an outburst (cf. AAVSO NEWS FLASH Nos. 27, 29). Available observations from postings:
1996 Apr. 2.810 11.9 Has.VSOLJ (N. Hasegawa)
3.786 11.8 Has.VSOLJ
11.736 12.0 Has.VSOLJ
18.3 11.8 BRJ (J. Bortle *1)
21.0 12.0 OB (D. Overbeek *1)
22.0 12.0 OB
23.0 12.0 OB
24.383 12.1 MRV (R. Medic *1)
27.0 12.0 OB
28.0 12.0 OB
May 14.9 11.9 MLF (B. Monard)
24.407 13.1 SQN (L. Shaw)
30.101 <13.0 OB
30.204 13.8 BRJ
31.162 <13.0 OB
Jun. 5.656 13.7 Has.VSOLJ
6.163 14.5 BRJ
(*1 from issues of AAVSO NEWS FLASH)
The object stayed at mv~11.8 since last September ( vsnet-alert 236, J. Bortle; vsnet-obs 1188, M. Moriyama; vsnet-obs 1273, S. Kiyota; vsnet-alert 249, J. Bortle).
The current rapid fading may represent an eclipse of the outbursting component by the red giant secondary star, a phenomenon which was most dramatically observed during the latest outbursts of AX Per, V1413 Aql (=AS 338) and FG Ser(=AS 296). Although I am not aware of any orbital ephemeris of this symbiotic binary (does anyone know?), I would like urge observers to closely monitor the object to see if any egress may occur in a month or so. Since evolvement of the eclipse in AX Per was quite rapid, nightly observations would help.
Regards,
Taichi Kato
Observer : Gabriel Hickel
(e-mail: hickel@das.inpe.br)
Inst. : 60cm Zeiss reflector + Fast Photometer (Hamamatsu R943-02)
LNA Observatory - Brasopolis - Brazil
Date Object Magnitude Colour Index
1996 V U-B B-V V-R R-I
(July/UT) error error error error error
26.95268 FN Sgr 13.179 -0.733 1.160 1.250 1.300
0.071 0.252 0.156 0.071 0.030
26.95981 FN Sgr 13.252 -0.755 1.241 1.233 1.337
0.075 0.266 0.170 0.075 0.030
27.05160 FN Sgr 12.970 -0.638 1.210 1.092 1.267
0.052 0.186 0.112 0.051 0.023
27.11263 FN Sgr 13.334 -0.696 0.947 1.269 1.270
0.086 0.231 0.153 0.090 0.060
27.12113 FN Sgr 12.929 -0.306 0.961 0.998 1.224
0.059 0.223 0.115 0.059 0.031
27.12286 FN Sgr 12.828 -0.441 1.053 0.950 1.201
0.054 0.213 0.110 0.054 0.029
27.12465 FN Sgr 12.884 -0.196 0.852 1.008 1.202
0.063 0.205 0.110 0.061 0.025
27.12646 FN Sgr 12.783 -0.369 0.963 0.919 1.177
0.052 0.215 0.110 0.053 0.030
27.12824 FN Sgr 12.793 -0.333 0.941 0.914 1.198
0.063 0.209 0.116 0.062 0.033
27.13234 FN Sgr 12.778 -0.034 0.822 0.904 1.161
0.054 0.201 0.101 0.053 0.025
27.13409 FN Sgr 12.743 -0.428 1.090 0.885 1.183
0.049 0.202 0.110 0.049 0.027
27.13580 FN Sgr 12.815 -0.350 0.867 0.937 1.238
0.058 0.181 0.099 0.057 0.027
27.13763 FN Sgr 12.819 -0.332 0.936 0.945 1.157
0.053 0.219 0.111 0.055 0.029
27.13946 FN Sgr 12.702 -0.178 0.895 0.863 1.198
0.050 0.197 0.095 0.049 0.027
27.14123 FN Sgr 12.741 -0.184 1.055 0.919 1.207
0.058 0.209 0.117 0.056 0.025
27.14305 FN Sgr 12.792 -0.094 1.150 0.951 1.201
0.059 0.274 0.121 0.060 0.033
27.14498 FN Sgr 12.861 -0.498 1.193 0.988 1.223
0.061 0.222 0.124 0.060 0.027
AAVSO NEWS FLASH No. 53 ( AAVSO ftp) reports a siginificant brighetening as cited below. Termination of an eclipse?
FN SAGITTARII
The symbiotic star FN Sgr is brightening as indicated by the following
observations:
AAVSO Observer AAVSO Observer
UT Mag. Initials UT Mag. Initials
JUL 17.1076 14.1 HAV AUG 16.1049 12.8 BRJ
JUL 20.1319 13.9 HAV AUG 19.1292 12.5 BRJ
JUL 21.1375 13.8 HAV AUG 22.1750 12.8: SQN
JUL 21.1382 14.3 BRJ AUG 23.1854 12.8 SQN
AUG 07.2785 12.3: SQN AUG 26.0694 12.1 BRJ
AUG 14.181 12.5 MRV
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