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J/PAZh/35/846   2000-2008 UBV observations of HD 179821       (Arkhipova+, 2009)
Photometric variability and evolutionary status of the supergiant with an
infrared excess HD 179821=V1427 aquilae.
    Arkhipova V.P., Esipov V.F., Ikonnikova N.P., Komissarova G.V.,
    Tatarnikov A.M., Yudin B.F.
   <Pis'ma Astron. Zh. 35, 846 (2009)>
   =2009PAZh...35..846A
   =2009AstL...35..764A
ADC_Keywords: Stars, variable ; Stars, supergiant ; Photometry, UBV

Keywords: post-AGB stars - spectroscopic and photometric observations -
          photometric variability - yellow hypergiants - evolution

Abstract:
    We present new results of our UBV photometry for HD 179821=V1427 Aql,
    an F supergiant with an infrared excess, from 2000 to 2008. The
    semiregular low-amplitude (Δ=0.05-0.20mag) photometric
    variability of the star with a cycle period from 130 to 200 days is
    caused by pulsations, along with the instability of a variable stellar
    wind. V1427 Aql also exhibits a long-term trend in the brightness and
    colors that is probably attributable to a change in the stellar
    temperature as a result of mass loss episodes, which cause variations
    in the continuum formation level. We present the results of our JHKLM
    photometry for V1427 Aql in 1992-2008.
Objects:
    -------------------------------------------------
       RA   (2000)   DE      Designation(s)
    -------------------------------------------------
    19 13 58.6   +00 07 32   V1427 Aql = HIP 94496
    -------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        25      278   UBV observations of HD 179821 in 2000-2008


See also:
   J/PAZh/27/187 : UBV observations of HD 179821 (Arkhipova+, 2001)


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

   Bytes Format Units   Label     Explanations

   1-  7  I7    d       JD        Julian date
   9- 13  F5.3  mag     Vmag      V magnitude
  15- 19  F5.3  mag     B-V       B-V colour index
  21- 25  F5.3  mag     U-B       U-B colour index


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    20-Nov-2009