[vsnet-chat 369] Re: More on V485 Cen

[Bj|rn H}kon Granslo <b.h.granslo@astro.uio.no>]

On Thu, 5 Jun 1997, Taichi Kato wrote:

>   Regarding the V485 Cen thread, I would like to know if anyone could
>help finding and summarizing Huruhata's discovery report in Harvard
>Bulletin 913 (1940) -- according to Glasby's reference -- and lacking
>in our library.
>   This literature would help understanding the seeming discrepancy
>between the cataloged and recently observed activity (cf. Jan Hers'
>comment in vsnet-chat 359) of this star.

This publication is available at our library (Astrophysical Institute,
University of Oslo). The discovery of this star was announced in
Masaaki Huruhata's paper "New Variable Stars in High Latitude Field
356" (Harv. Bull. 913 (1940), p. 14-17). Relevant parts of this paper
is quoted below:

    "As a part of the study of variable stars in high latitudes,
    HLF 356, centered at R.A. 12h 40m, Dec. -32 deg, and covering
    about 80 square degrees, is reported upon in the present note.
    Galactic coordinates for the field are lambda = 270 deg,
    beta = +31 deg. The following plates, taken between March 1935
    and July 1938, were used:
          No. of                                 Plate
          Plates             Telescope           Series
           102        10-in. Metcalf triplet      MF
            14        24-in. Bruce doublet        A

    In the search for the variables, positives of four MF and two
    A plates were intercompared with twenty-eight MF and ten A
    plates, respectively; and it is believed that the work of
    discovery has been carried out as completely as the present
    plate material justifies.
    ...
    One hundred and eight new variable stars are listed in the
    usual form in Table I; and in Table II, eighteen stars with
    ranges of less than than half of a magnitude that are
    suspected of variability.
    
    The sequence was determined by the star-count method.
    Measurements of the magnitudes of the short-period stars were
    made in thirty MF plates, but when the type was doubtful more
    plates were used. ... For the three SS Cygni type variables,
    magnitude estimates were made on recent region plates in
    addition to the MF and A plates. "

V485 Centauri is apparently identical to the object identified as
Harvard Variable no. 10231. The following entry for this star
was listed in table 1:

    "H.V.   R.A. (1900) Decl.  Max.   Min.  Type   Approx.   Remarks
            h  m  s    o   '    m      m           Period
    10231  12 51 55  -32 40.7 13.0  [16.3  SS Cyg  10: days  Note 10

    Note 10: SS Cygni type variable with frequently recurring maxima
    of a duration of about four days. On the MF plates, there are 60
    negative observations, five observations under 15 mag., and nine
    well-observed maxima, as follows:
         J.D.             J.D.             J.D.
         242+    Mag.     242+    Mag.     242+    Mag.
         8257    14.5     8604    14.5     8722    14.9
         8315    13.2     8640    13.3     8743    14.5
         8357    14.7     8714    14.4     9019    15.0

    There is a slight indication of a period of approximately ten
    days."

Hope this helps.
                                   Yours sincerely,
                                   Bjoern H. Granslo

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Bjorn H. Granslo            Telephone: +47 22 85 75 21 / +47 22 85 65 18
Postboks 1029, Blindern                     Email: bgranslo@astro.uio.no
N-0315 Oslo, Norway          WWW: http://vsnet.uio.no/~bgranslo/index.html
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