J/PAZh/32/48 UBV photometry of HD 331319 (Arkhipova+, 2006)
Study of the IR-Excess Supergiant HD 331319.
Arkhipova V.P., Ikonnikova N.P., Komissarova G.V., Esipov V.F.
<Pis'ma Astron. Zh. 32, 48 (2006)>
=2006PAZh...32...48A 2006PAZh...32...48A
=2006AstL...32...45A 2006AstL...32...45A
ADC_Keywords: Stars, supergiant - Photometry, UBV
Keywords: post-AGB supergiants - photometric and spectroscopic observations -
photometric variability
Abstract:
We report the discovery of brightness variability in the IR-excess
early F supergiant HD 331319, a candidate post-AGB star. Over three
years of systematic UBV observations, the star showed low-amplitude
(up to 0.17m in V) quasi-periodic brightness variations on a
time scale of 45 days. A preliminary analysis of our photometry
indicates that HD 331319 and other typical post-AGBF supergiants have
a similar pattern of variability. A study of the extinction toward HD
331319 leads us to conclude that the fraction of the circumstellar
extinction is small for this star. We present low-resolution
spectroscopy for HD 331319 and discuss the spectral classification of
post-AGB F supergiants using HD 331319, HD 161796, HD 187885, and
HD 56126 as examples.
Description:
We began our UBV observations of HD 331319 in 2002. From June 2002
through April 2005, we obtained 104 magnitude estimates for the star
with a photoelectric photometer attached to a 60cm Zeiss-600 telescope
at the Crimean Station of the Strenberg Astronomical Institute.
Objects:
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RA (2000) DE Designation(s)
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19 49 29.5 +31 27 16 HD 331319 = IRAS 19475+3119 = PN PM 2-42
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 40 132 UBV observations of HD 331319
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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 Umag U magnitude
15- 20 F6.3 mag Bmag B magnitude
22- 27 F6.3 mag Vmag V magnitude
29- 33 F5.3 mag U-B U-B color index
35- 39 F5.3 mag B-V B-V color index
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(End) Veta Avedisova [INASAN] 13-Apr-2006