[vsnet-chat 530] Re: some more on V4074 Sgr

[Taichi Kato <tkato>]

>      Indeed IRAS 18129-3053 = MWC 288 = HD 167362 according to SIMBAD, but
> this is evidently not V4074 Sgr, which listed as being ~7 tsec west and 
> about 1' south.  The HD star is a planetary nebula, by the way, and the
> IRAS flux "colors" suggest this ID is correct.

   Actually, "Allen's star" coincides with PK 1-6.2 = SwSt 1 marked in the
findng chart of Perek and Kohoutek's PN catalogue.  This catalogue classified
the PN as class I (stellar appearance).  According to Allen's description,
his finding chart apparently followed Perek and Kohoutek.  However, Allen
gave his own spectrogram of AS 295B, which apparently shows emission lines
(including forbidden lines) superimposed on M-type continuum -- apparent
symbiotic spectrum.  If Allen took his labelled star, it is difficult to
reconcile with the simple PN interpretation of this star.  Or he mistook
the finding chart only?

   In AS catalog, AS 295 was listed as MHalpha 304-41, 2' n.p. HD 167362.
This description agrees with Duerbeck's identification, but it seems
a little strange there was no mentioning about the emission-line nature of
HD 167362.  In Henize's catalog, only the position (18h 09m.6 -30o 54'
1900.0) was given for Hen1641.  Again there is no entry for HD 167362,
though this catalog seems to bear the nature of compilation.

   Wouldn't it be the fact there is only one emission line star, which
was at times classified as a planetary nebula, and at times a variable
(symbiotic) star?

   Anyway, please avoid using the VSNET chart for V4074 Sgr.  Hipparcos
stars in this field being almost certainly of peculiar nature, this chart
would require independent calibration.

Regards,
Taichi Kato

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