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[vsnet-campaign 1270] Possible nova or a unique variable object in Monoceros = GSC 4822.39

Possible nova or a unique variable object in Monoceros = GSC 4822.39

   Takashi Iijima (Asiago) relays the discovery report of a possible nova
by N. J. Brown (details unknown).

   The existence of the object has been confirmed by Iijima, Seiichiro
Kiyota (Tsukuba, Japan), Akira Takao (Kitakushu, Japan), Makoto Uemura
(Ouda Station, Kyoto University).

   H. Yamaoka, Kyushu University, measured a precise position of this 
object using the V-band CCD image (with 0.25-m SCT) taken on Jan.
9.496 UT by S. Kiyota, Tsukuba, Ibaraki, Japan, as: R. A. =
7h04m04s.801, Decl. = -03o50'50".77 (equinox 2000.0, 29 Tycho-2 stars,
uncertainty ~ 0".3). It suggests that this object is identical to IRAS
07015-0346, or 2MASS source whose position end figures are 4s.82,
50".5.

   According to Iijima's report, the spectrum is dominated by a very
red continuum, but without Balmer feature (neither in emission nor
absorption).  Several weak metal lines are seen in emission.
Neither H-alpha emission nor prominent TiO absorption bands are seen
on a low-resolution spectrum taken by Kiyota.

   The corresponding 2MASS object is:

07:04:04.82 -03:50:50.5  J=13.905 H=13.480 K=13.347

   The IR color (and also V-J color) excludes the possibility of a
long-period variable.  The IRAS color (of the liklely far IR counterpart)
is very unusual for a stellar object:

070405.0 -035046 (2000.0) IRAS07015-0346 0.250L 0.250L 1.398 4.582 -1%

   Although the object seems to be some sort of an eruptive object or
a peculiar nova, the nature of the object is still unknown.  It may be
possible the phenomenon is related to a flash in hydrogen-poor environment.

   H. Maehara (Saitama, Japan) reports the following visual observation:

object         YYYYMMDD(UT)   mag  code
GSC4822.39     20020109.625   107  Mhh.VSOLJ

(GSC name tentatively given here)

   Follow-up observations of this peculiar object is strongly needed.

Regards,
Taichi Kato
VSNET

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