V4742 Sgr: Nova Sgr 2002 No.2
CCD image taken by B. Monard
W. Liller discovered a new stellar object of about 8.5mag on September
15. Nothing brighter than mag 11.5 appears on two photos taken at September
11 (vsnet-campaign-nova
976, vsnet-campaign-news
172). The probable optical counterpart of this IR source is very
dim even on DSS 2 red plate (r=17.93)(vsnet-campaign-nova
980). C. Buil performed spectroscopy and reported H-alpha emission line
(FWHM=1100km) with a very deep P-Cygni profile, which indicated a young
nova (vsnet-campaign-nova
984). The spectrum taken by M. Fujii on September 17 showed Balmer
lines and Fe II series emission lines, which indicated V4742 Sgr is an
Fe II-class nova (vsnet-campaign-nova
1007, 1008).
H. Yamaoka reported a position of the nova through precise astrometry, which
suggested that no source can be seen on every DSS images within 3" from
the position (vsnet-campaign-nova
993, 1006).
This finding makes a lower limit of the outburst amplitude of ~12 (or
possibly 13) mag. T. Kato commented that this large outburst amplitude
possibly qualifies this object as a fast nova (vsnet-campaign-nova
994).
The fading rate became more gradual with time (vsnet-campaign-nova
1088).
D. West performed BVR photometry and reported that the large B-V indicates
the nova was highly reddened (vsnet-campaign-nova
999). Nova Sgr 2002 No. 2 discovered by W. Liller has been given
the above official permanent designation (V4742 Sgr) in IAUC 7972 (vsnet-campaign-nova
1002).
Other articles:
vsnet-campaign-nova
977, 978,
979,
981,
982,
983,
986,
987,
990,
992,
991,
995,
996,
997,
998,
1000,
1001,
1003,
1004,
1005,
1009,
1010,
1012,
1039,
1040,
1044,
1051,
1058,
1060,
1054,
1064,
1067,
1070,
1075,
1077,
1082,
1079,
1084,
1087,
1090,
1093,
1099,
1104,
1115,
1142
Links:
Spectrum taken by C. Buil:
http://astrosurf.com/buil/us/nsgr2/nsgr2.htm
[vsnet-campaign-nova
984] [vsnet-campaign-nova
1011]
Spectrum taken by M. Fujii:
http://www1.harenet.ne.jp/~aikow/v4742_sgr_20020917.gif
[vsnet-campaign-nova
1007]
Chart presented by R. Bouma:
http://www.shopplaza.nl/astro/vs-charts/nova2002SGE.htm
[vsnet-campaign-nova
985]
CCD image taken by B. Monard:
/vsnet/ftpfile/Novae/nova_sgr02-2/mon16.gif
[vsnet-campaign-nova
987]
Chart presented by the AAVSO:
http://charts.aavso.org/SGR/N_SGR_02_2/
[vsnet-campaign-nova
988]
V4742 Sgr Spectra observed by C. Buil:
http://astrosurf.com/buil/us/nsgr2/nsgr2.htm
[vsnet-campaign-nova
1085]
VSNET special page for this object:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Novae/nsgr02-2.html