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J/PAZh/38/183       IRAS 19336-0400 UBV light curves          (Arkhipova+, 2012)
Variability of hot supergiant IRAS 19336-0400 in the early phase of planetary
nebula ionization.
    Arkhipova V.P., Burlak M.A., Esipov V.F., Ikonnikova N.P., Komissarova G.V.
   <Pis'ma Astron. Zh. 38, 183 (2012)>
   =2012PAZh...38..183A
   =2012AstL...38..157A
ADC_Keywords: Stars, supergiant ; Photometry, UBV

Keywords: proto-planetary nebulae - photometric and spectral observations -
          light variability

Abstract:
    We present photoelectric and spectral observations of a hot candidate
    proto-planetary nebula early B-type supergiant with emission lines in
    spectrum-IRAS 19336-0400. The light and color curves display fast
    irregular brightness variations with maximum amplitudes
    {Detla}V=0.30m, {Detla}B=0.35m, {Detla}U=0.40m and color-brightness
    correlations. By the variability characteristics IRAS 19336-0400
    appears similar to other hot proto-planetary nebulae

Description:
    In 2006 we started systematic photometric observations of IRAS
    19336-0400. Measurements were carried out on the 60-cm telescope
    Zeiss-1 at SAI Crimean Station with the use of photoelectric UBV
    photometer constructed by Lyuty (1971, Soobshch. GAISh 172, 30).
Objects:
    ---------------------------------------------------------------
       RA   (2000)   DE        Designation(s)
    ---------------------------------------------------------------
    19 36 17.52  -03 53 25.3   IRAS 19336-0400  = PN G034.5-11.7
    ---------------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        24      155   UBV observations of IRAS 19336-0400 in 2006-2011


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  7  I7    d       JD        Julian date
   9- 13  F5.2  mag     Vmag      V magnitude
  15- 18  F4.2  mag     B-V       B-V colour index
  20- 24  F5.2  mag     U-B       U-B colour index


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    18-Apr-2012