[vsnet-id 288] Re: NSV 12041

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Dear all concerned,

  Thank you very much for the cooperations and sorry for my late
response.  Here is a summary for NSV 12041 up to now.  Please point
out if my understanding is incorrect.

a) The identification of NSV 12041

  The location of NSV 12041 (Ref. Bidelman and MacConnell (1973), AJ,
78, 687, on the Table VIII, page 728) is of 0.04 Min. *west* of 
BD -21 5395.  The USNO-A2.0 catalog has 2 candidates for this
constraint: 

USNO-A2.0 0675-33182874  19h27m53s.53 -21o35'53".6  r=15.7 b=16.0
USNO-A2.0 0675-33182704  19h27m53s.37 -21o35'40".6  r=17.9 b=17.2

The latter, however, is not so bright on 2MASS image (can be hidden in
the glare of the former, which is a bright IR source), so would not be
a extreme red star.  Also the former clearly shows the variability on
DSS images.  Then, the identification of NSV 12041 with the former
star seems to be confident.

# The latter star is the "north" star mentioned by J. Greaves
# (vsnet-chat 3581).

  USNO-A2.0 0675-33182874 is actually a stellar complex constructed by
at least 6 stars.  It lies like (see with the constant-width font):

            E
          C              North
       A     F           |
      B   D       East --+

The USNO-A2.0 position seems to be coincident with the star "C", which
shows the variability and is the brightest one on every DSS images.  

  T. Scarmato, who had first pointed this star out, says that he will
continue the observation of this object to clarify the variability.

B) Identification with IR sources

  BD -21 5395 and NSV 12041 are both bright IR source.  On 2MASS
images, the former is the brighter.  The 2MASS catalog and IRAS
FSC/SSC contains these two as:

BD -21 5395:

GSC6309.1204 192756.06 -213541.7 (2000.0)  9.15 6
GSC6309.1204 192756.08 -213542.2 (2000.0) 10.62 0
USNO0675.20727787 192755.997 -213541.18 (2000.0) 10.7 11.7 * (USNO-A1.0)
USNO0675.33185742 192756.004 -213542.11 (2000.0) 8.6 11.3 (USNO-A2.0)
2MASS 192755.992 -213542.36 (2000.0)  0.000  0.000  0.000
192755.2 -213537 (2000.0) SD-21.5395 9.3
192755.3 -213548 (2000.0) CPD-21.7391 9.7
192755.9 -213542 (2000.0) 954 1.57 TYC6309.1204.1 plx=8.9(26.0) (0.04 0.14)
192755.9 -213542 (2000.0) 949 1.65 TYC2-6309.1204.1 (9.67 0.03) (11.61 0.10)
192755.1 -213546 (2000.0) FSC19249-2141 3.620 1.501 0.257L 1.570L

NSV 12041:

USNO0675.20725914 192753.630 -213553.43 (2000.0) 13.3 15.9 (USNO-A1.0)
USNO0675.33182874 192753.527 -213553.56 (2000.0) 15.7 16.0 (USNO-A2.0)
2MASS 192753.574 -213552.67 (2000.0)  6.498  5.616  5.113
IRAS19249-2142 192454.5 -214203 (1950.0)
    F12=3.63  F25=1.44  F60=0.40L F100=1.00L
    VAR= 6 LRS=-1
 possibly II: variable star with 'young' O-rich circumstellar shell
 or VII: variable star with more evolved C-rich circumstellar shell
192752.8 -213554 (2000.0) IRAS19249-2142 3.511 1.394 0.400L 1.000L 6%
192752.8 -213554 (2000.0) SSC19249-2142 3.511 1.394 0.400L 1.000L

  The offset between the 2MASS position and USNO-A2.0 position of NSV
12041 can possibly be explained by the effect of the northern star
(USNO-A2.0 0675-33182704) on IR images, as J. Greaves pointed out.  

  Again, thank you very much for the discussions.

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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