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 2009PAZh...35..846A
=2009AstL...35..764A 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:
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RA (2000) DE Designation(s)
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19 13 58.6 +00 07 32 V1427 Aql = HIP 94496
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 25 278 UBV observations of HD 179821 in 2000-2008
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See also:
J/PAZh/27/187 : UBV observations of HD 179821 (Arkhipova+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Nov-2009