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[vsnet-obs 2388] (fwd) Article about ZZ Dra

From vsnet-adm-request@kusastro.kyoto-u.ac.jp Fri Mar 15 07:04:31 1996
From: Ole.Klinting@53611928.da.diatel.dk
Date: 14 Mar 96 22:57 GMT+0100
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Subject: Article about ZZ Dra
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ZZ Dra. Improved elements.

Summary:

   The mira variable ZZ Dra has been observed by members of ASTRONOMISK
   SELSKAB, Denmark. From observations covering the years 1947-1994 I have
   derived 25 maxima, and these have been compared to the elements given
   in GCVS 4 (Max=41209, P=267,9), see the table below.

   As the residuals are rather great I made a trend line analysis, which
   gave as result the following elements:

   Max= 41222       P=269.42

   as the best expression of the stars variation in the nearly 50 years.

   The residuals when compared to my new elements are also given in the
   table.


Maxima:

                                 GCVS4    new
         JD      Magn.     E      O-C     O-C

max     32312             -33     -56     -19
max     32587             -32     -49     -14
max     32861             -31     -43      -9
max     33418             -29     -22       9
max     33687             -28     -21       9
max     33965             -27     -11      17
max     34227             -26     -17      10
max     34509             -25      -3      23
max     37999             -12       5      10
max     39047              -8     -19     -20
max     43908      8,9     10      20      -8
max     44165      9,0     11       9     -21
max     44718      9,8     13      26      -6
max     44976     10,4     14      16     -18
max     45265      8,8     15      38       2
max     45799      9,6     17      36      -3
max     46075      9,2     18      44       3
max     46332      8,7     19      33      -9
max     46886      9,8     21      51       6
max     47427      9,1     23      56       8
max     47700      9,1     24      61      12
max     47961      8,5     25      55       4
max     48231      8,4     26      57       4
max     48504      9,4     27      62       8
max     49581      9,0     31      67       7


Ole Klinting

e-mail: ole.klinting@53611928.da.diatel.dk