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Even better, the new nebula is reported now to be
getting brighter!!, the 'new' or variable star that's illuminating it is
definitely erupting! It
might even be visible soon , who
knows.
Keith...
----- Original Message -----
Sent: Tuesday, February 10, 2004 6:57
PM
Subject: [APML] A new Nebula discovered
in M78!!!
Dear friends, I want to suggest you to check all
your recent images of M78, since a new *bright* nebula has been just
discovered near there with a 3" refractor! Here is an abstract of Central
Bureau for Astronomical Telegrams #8284
Circular No. 8284
Central Bureau for Astronomical
Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian
Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX
617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL
http://cfa-www.harvard.edu/iau/cbat.html
ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use
only)
IRAS 05436-0007
A report was
received from J. W. McNeil, Paducah, KY, of the
appearance of a new nebula
in a dense region of the Lynds 1630
cloud in Orion, and apparently
associated with IRAS 05436-0007, on
his unfiltered CCD images taken with a
7.6-cm refractor on Jan. 23
UT. The object, which is located at R.A.
= 5h46m14s, Decl. =
-0o05'.8 (equinox 2000.0), was then of total mag about
15-16 (with
his CCD camera's sensitivity peaking at 575 nm), but it is
not
present on seven Digitized Sky Survey images from 1951 to 1991.
B.
Reipurth, University of Hawaii (UH), confirms that a faint
optical
counterpart to IRAS 05436-0007 has gone into outburst and
has
produced a large reflection nebulosity, based on
preliminary
examination of red broadband CCD images obtained with K. Meech
at
the UH 2.2-m telescope on Jan. 31. Reipurth adds that this is
a
very rare event, apparently similar to that involving IRAS
05380-0728
(cf. Reipurth and Bally 1986, Nature 320, 336). The
outburst may be
an EX-Lup-type or FU-Ori-type eruption, driven by a
sudden increase of
accretion through a circumstellar disk, and thus
in urgent need of
observation (see Herbig 1977, Ap.J. 217, 693;
Lehmann et al. 1995, A.Ap.
300, L9; Hartmann and Kenyon 1996, ARAA
34, 207). Reipurth also notes
that HH 22 is in the line-of-sight
of this new nebula but is not physically
involved with the nebula
(Eisloeffel and Mundt 1997, A.J. 114,
280).
Some images of the discover are visible on McNeil's
site:
There are traces of this nebula on images back to
2001, I checked on one of my shot taken in 1999 and there is no hint of it.
Unbelievable but sometime something in the
universe changes :-)
Marco
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