J/PAZh/42/831 V1027 Cygni UBV and JHKLM photometry (Arkhipova+, 2016)
Photometric and spectroscopic study of the supergiant with an infrared excess
V1027 Cygni.
Arkhipova V.P., Taranova O.G., Ikonnikova N.P., Esipov V.F.,
Komissarova G.V., Shenavrin V.I., Burlak M.A.
<Pis'ma Astron. Zh. 42, 831 (2016)>
=2016PAZh...42..831A 2016PAZh...42..831A (SIMBAD/NED BibCode)
=2016AstL...42..756A 2016AstL...42..756A
ADC_Keywords: Stars, variable ; Stars, supergiant ; Photometry, UBV ;
Photometry, infrared
Keywords: post-AGB stars - photometric observations - photometric variability -
spectroscopic observations - spectral classification - evolution
Abstract:
We present the results of our UBV and JHKLM photometry for the
semiregular pulsating variable V1027 Cyg, a supergiant with an
infrared excess, over the period from 1997 to 2015 (UBV) and in
2009-2015 (JHKLM). Together with the new data, we analyze the
photometric observations of V1027 Cyg that we have obtained and
published previously. Our search for a periodicity in the UBV
brightness variations has led to several periods from P=212d to 320d
in different time intervals. We have found the period P=237d based on
our infrared photometry. The variability amplitude, the lightcurve
shape, and the magnitude of V1027 Cyg at maximum light change
noticeably from cycle to cycle.
Description:
We began the UBV observations of V1027 Cyg in 1991. The results of its
observations over 1991-1996 were published in Arkhipova et al.
(1991ATsir1551....7A 1991ATsir1551....7A, 1992PAZh...18..436A 1992PAZh...18..436A, 1997PAZh...23..794A 1997PAZh...23..794A). After
1996 we continued the observations of V1027 Cyg with a 60-cm Zeiss
reflector at the Crimean Station of the Sternberg Astronomical
Institute with a photon-counting photoelectric photometer
The IR photometry for V1027 Cyg was performed in 1991-2015 with a
1.25-m telescope at the Crimean Station of the Sternberg Astronomical
Institute using a photometer with a photovoltaic
liquid-nitrogen-cooled InSb detector.
Objects:
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RA (2000) DE Designation(s)
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20 02 27.38 +30 04 25.5 V1027 Cyg = HD 333385
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 491 UBV photometry for V1027 Cyg
table3.dat 34 32 JHKLM photometry for V1027 Cyg over the period
2009-2015
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See also:
J/PAZh/26/465 : IRAS 20004+2955 (V1027 Cyg) chemical comp. (Klochkova+, 2000)
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 Johnson V magnitude
15- 20 F6.3 mag Bmag Johnson B magnitude
22- 27 F6.3 mag Umag Johnson U magnitude
29- 33 F5.3 mag B-V Johnson B-V color index
35- 39 F5.3 mag U-B Johnson U-B color index
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 F9.1 d JD Julian date
11- 14 F4.2 mag Jmag Johnson J magnitude
16- 19 F4.2 mag Hmag Johnson H magnitude
21- 24 F4.2 mag Kmag Johnson K magnitude
26- 29 F4.2 mag Lmag Johnson L magnitude
31- 34 F4.2 mag Mmag ?=- Johnson M magnitude
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Acknowledgements:
Natalia Ikonnikova, ikonnikova(at)gmail.com
(End) Patricia Vannier [CDS] 06-Dec-2016