V4744 Sgr: Nova Sgr 2002 No.4
Left: CCD image taken by A. Miyashita. Right: Spectrum taken by M. Fujii.
A possible nova (red mag 9.7) in Sagittarius was discovered by V. Tabur
on CCD images taken on October 25. W. Liller confirmed it to be V=9.98
on October 27 (vsnet-campaign-nova
1117, 1118).
This object in Sgr was given the permanent GCVS designation, V4744 Sgr
(vsnet-campaign-nova
1129). No variable star at this location was reported by OGLE II team.
Together with the lack of a bright 2MASS counterpart, the object was proposed
to be most likely a nova (vsnet-campaign-nova
1119). Multi-color observations by S. Kiyota showed that the possible
nova seemed to be relatively reddened (vsnet-campaign-nova
1121). In the spectrum taken by M. Fujii on October 29, a weak and narrow
H-alpha emission line, associated with a prominent P Cyg profile, was detected.
V4744 Sgr hence turned out to be a fourth nova in Sgr in 2002. The NaD
absorption line was strong. M. Fujii commented that the overall appearance
of the spectrum resembles those of V838 Mon taken around 2002 Feb. to Mar.
(vsnet-campaign-nova
1131). Even in the deepest DSS image (limiting Rmag about 21.0) and
2MASS infrared image, no object can be found within 5" of this position
(vsnet-campaign-nova
1137, 1138).
Tha lack of a bright 2MASS counterpart seems to preclude the possibility
of a symbiotic nova (vsnet-campaign-nova
1139). M. Fujii obtained a spectrum on November 4, in which stronger
H-alpha (FWHM 950 km/s), H-beta emission lines, and stronger P Cyg-type
profile of the Na D line were seen. The spectrum clearly showed Fe II series
emission, indicating that the object is most likely an Fe II-class nova
caught in an early stage of its evolution (vsnet-campaign-nova
1143). This nova almost remained at the bright state over one week,
which implies a slow nova (vsnet-campaign-nova
1140).
Other articles:
vsnet-campaign-nova
1122, 1123,
1124,
1126,
1127,
1128,
1130,
1132,
1133,
1134,
1136
Links:
CCD image taken by S. Kiyota:
http://www.milky.ne.jp/~meineko/CCD/nvSgr2002-4.jpg
[vsnet-campaign-nova
1125]
Spectrum taken by M. Fujii:
http://www1.harenet.ne.jp/~aikow/v4744_sgr.gif
[vsnet-campaign-nova
1131]
V4744 Sgr Spectrum on November 4 by M. Fujii:
http://www1.harenet.ne.jp/~aikow/v4744sgr_20021104.gif
[vsnet-campaign-nova
1143]
VSNET special page for this object:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Novae/nsgr02-4.html