[vsnet-id 12] On RX Mon ID

[Taichi Kato <tkato>]

On RX Mon ID

  Moved from vsnet-obs to this forum:

From: "G.Comello" <comello@astro.rug.nl>
Date: Mon, 21 Dec 1998 16:38:51 +0100 (MET)
Subject: [vsnet-obs 18486] RX Mon [vsnet-mira 3520]

Dear Dr. Kato,

About your comment on RX Mon I suppose that Mr. Hirosawa estimated the bright
star close to RX. The position of this bright star is not correct. RX Mon is
quite faint and higher powers are needed to estimate it now. 
-- 
Georg Comello                           | Tel.  : (31)-50-3634050
Kapteyn Laboratorium                    | Fax   : (31)-50-3636100
University of Groningen                 | E-mail: comello@astro.rug.nl
P.O. Box 800,  9700 AV Groningen        |
The Netherlands                         |

Date: Tue, 22 Dec 1998 02:38:58 +0900 (JST)
From: Taichi Kato <tkato>
Subject: [vsnet-obs 18487] RX Mon previous data

RX Mon previous data

Re: [vsnet-obs 18486] RX Mon [vsnet-mira 3520]

Georg Comello wrote:

> About your comment on RX Mon I suppose that Mr. Hirosawa estimated the bright
> star close to RX. The position of this bright star is not correct. RX Mon is
> quite faint and higher powers are needed to estimate it now. 

  There have been apparent discrepancies between reported magnitudes:

  YYMMDD(UT)   mag  observer
  970403.860   127  (G. Comello)
  971031.160   128  (G. Comello)
  971108.119   127  (G. Comello)
  971225.573    94  (K. Kanatsu)
  980203.940   126  (G. Comello)
  980321.800   128  (G. Comello)
  981205.833    85  (K. Hirosawa)
  981217.826    85  (K. Hirosawa)
  981220.969   128  (G. Comello)

  The object has been observed either bright or faint, none between.

  I have identified RX Mon with the following Hipparcos variable; observers
please check the chart used.

GSC4825.1462 072921.26 -041643.9 (2000.0) 11.52 0
USNO0825.04991802 072921.329 -041643.88 (2000.0)  8.8 11.8
IRAS07268-0410 072652.4 -041028 (1950.0)
    F12=14.45  F25=5.25  F60=1.00  F100=1.00L
    VAR=34 LRS=14
    blue featureless, spec.index=2.0
    II: variable star with 'young' O-rich circumstellar shell
072921.1 -041657 (2000.0) RAFGL4603S
072921.1 -041657 (2000.0) TMSS00156
072921.5 -041643 (2000.0) IRAS07268-0410 14.040 5.038 0.955 1.000L 34% 2(LRS)
072921.5 -041643 (2000.0) SSC07268-0410 14.040 5.038 0.955 1.000L
072921.3 -041643 (2000.0) 1234 TYC4825.1462.1
072921.3 -041643 (2000.0) 1234HV3 1.50 HIP036394 plx=4.01(3.39) (0.00 0.51) P 9.01-13.22
072921.2 -041643 (2000.0) MONRX * M 9.6 <13.0 P 35800 345.7 - M6e-M9 R1/MON1

From: "G.Comello" <comello@astro.rug.nl>
Subject: Re: [vsnet-obs 18487] RX Mon previous data
Date: Tue, 22 Dec 1998 13:40:51 +0100 (MET)

Dear Dr. Kato,

I checked the position of RX Mon on both O- and E-type POSS-charts. In my
opinion there can be no doubt of the position of RX Mon. On these charts there
is a brighter star of m=9-10 (?) at 60" NE of RX. That star is brighter than
RX on the E-type POSS-chart, this suggests that it is a reddish star also. 
The Millennium Star Atlas shows both stars. It strengths my opinion that the 
Japanese observers have estimated the wrong star, and did not see RX Mon=
#Hipparcos 36394 at all. I think that there is no reason for any confusion-
problems. Also the AAVSO e-chart gives both stars in the right situation. 

-- 
Georg Comello                           | Tel.  : (31)-50-3634050
Kapteyn Laboratorium                    | Fax   : (31)-50-3636100
University of Groningen                 | E-mail: comello@astro.rug.nl
P.O. Box 800,  9700 AV Groningen        |
The Netherlands                         |

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