[vsnet-alert 4493] Recovery of NSV 24062

[Seiichi Yoshida <comet@aerith.net>]

Dear colleagues,

I am Seiichi Yoshida working on the MISAO Project.

Seiichi Yoshida and KenIchi Kadota recovered a possible symbiotic star
discovered by Yukio Sakurai in 1994 (cf. IAUC 6051), NSV 24062. Here
is the report. Everything is made clear by public discussion on the
VSOLJ (Variable Star Observers' League in Japan) mailing list. Thanks
so much for the contributors.

In the course of variable star survey based on the MISAO Project
observations, Seiichi Yoshida discovered a variable star at
R.A. 17h59m39s.58, Decl. -25o13'30".0 (2000.0) with a range of 10.8 -
12.4 mag from unfiltered CCD variable star survey images taken by
Kadota between 1999 April and 2000 February, being supported by the
semi-automated variable star detection by a software, the PIXY
system. Here is the photometry:

1999 Apr  8.75186	11.4C
1999 Apr  8.75242	11.4C
1999 Apr 30.74588	10.8C
1999 Apr 30.74631	10.9C
1999 Sep 23.42939	11.6C
1999 Sep 23.42981	11.5C
2000 Feb 24.83137	12.4C

The position and magnitude are measured with USNO-A1.0 catalog. 

Taichi Kato pointed out that this object is probably identified with 
NSV 24062, a possible symbiotic star discovered by Yukio Sakurai in
1994 (cf. IAUC 6051). The position of NSV 24062 is R.A. 17h56m35s.54,
Decl. -25o13'15".7 (1950.0), R.A. 17h59m40s.6, Decl. -25o13'24"
(2000.0). Kato also pointed out that no observations have been
reported since 1994 August.

The angular distance between these two stars is 15 arcsec. Therefore,
we must have recovered the outburst of this star. And the position in
IAUC 6051 is probably inaccurate.

Here is the magnitude reported in IAUC 6051. 

1950 Jul		19B
1976 May		14-15B
1977 Jun		12R
1994 May 20		[12.5p
1994 Jun 17		[11.5p
1994 Jul  3		[11:p
1994 Jul 28.520		11.4p
1994 Aug  8.548		11.4p
1994 Aug 10.161		12.41V

There is no data recorded in the IRAS Point Source Catalog, therefore
it must be faint in IR-band in 1983.

At the position of the star discovered in the MISAO Project, there is
a bright star USNO-A2.0 0600.29859229, however, no data is recorded in
the USNO-A1.0 catalog.

USNO-A2.0 0600.29859229  17 59 39.613  -25 13 30.30  12.1R  14.2B

Hitoshi Yamaoka investigated the DSS-1 and the DSS-2 images and found
this star on them. On the DSS-1 blue UK Schmidt plate taken on
Sept. 15, 1987, it was as bright as USNO-A1.0 0600.14859958, 15.2
mag(R), 16.8 mag(B). On the DSS-2 red UK Schmidt plate taken on
Sept. 7, 1991, it was very bright, brighter than USNO-A1.0
0600.14861605, 11.7 mag(R), 15.0 mag(B), as bright as (or a bit
brighter than) USNO-A1.0 0600.14850922, 11.2 mag(R), 11.8 mag(B), and 
a bit fainter than USNO-A1.0 0600.14874588, 10.9 mag(R), 12.2 mag(B).
At the position of NSV 24062 described in IAUC 6051, there is no data
recorded in the USNO-A1.0 and USNO-A2.0 catalogs, and no star was
found on the DSS-1 and the DSS-2 images. But 10 arcsec from the
position, there is a star USNO-A1.0 0600.14859811, 13.3 mag(R), 15.0
mag(B) = USNO-A2.0 0600.29861167, 12.5 mag(R), 15.3 mag(B).

The finding chart of this star based on the Kadota's images is
available at:

  http://vsnet.aerith.net/pub/NSV24062.gif

Best regards,

--
Seiichi Yoshida
comet@aerith.net
http://vsnet.aerith.net/

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