J/PAZh/33/679 UBV phot. and equivalent widths of V886 Her (Arkhipova+, 2007)
Variability and rapid evolution of the protoplanetary object
IRAS 18062+2410 = V886 Her.
Arkhipova V.P., Esipov V.F., Ikonnikova N.P., Komissarova G.V., Noskova R.I.
<Pis'ma Astron. Zh. 33, 604 (2007)>
=2007PAZh...33..679A 2007PAZh...33..679A
=2007AstL...33..604A 2007AstL...33..604A
ADC_Keywords: Stars, supergiant; Photometry, UBV
Abstract:
We present our long-term photometric and spectroscopic observations of
a high-latitude B supergiant with an infrared excess - the
protoplanetary nebula IRAS 18062+2410. Our UBV observations in
2000-2006 have confirmed the rapid irregular photometric variability
of the star with a maximum amplitude as high as 0.4m in V that we
found previously. The B-V and U-B color indices vary with amplitudes
as high as 0.10m and 0.25m, respectively, and show no clear
correlation with the brightness. Our V-band CCD observations on 11
nights in 2006 have revealed brightness trends during the night. The
variability of IRAS 18062+2410 is similar in pattern to the light
variations in other hot post-AGB objects and some of the nuclei of
young planetary nebulae. We assume that pulsations and a variable
stellar wind can be responsible for the variability of these stars. In
addition to the rapid variability, our 12-year-long observations have
revealed a systematic decline in the mean brightness of
IRAS 18062+2410.
Objects:
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RA (2000) DE Designation(s)
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18 08 20.086 +24 10 43.36 V886 Her = IRAS 18062+2410 = HD 341617
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 220 UBV observations of IRAS18062+2410 in 2000-2006
table4.dat 23 40 Equivalent widths of Hβ, Hα, and
[NII] 6584 lines
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See also:
J/PAZh/25/30 : UBV photometry of IRAS 18062+2410 (Arkhipova+, 1999)
J/PAZh/26/705 : UBV observations of post-AGB supergiants (Arkhipova+, 2000)
J/PAZh/27/187 : UBV observations of HD 179821 (Arkhipova+, 2001)
J/PAZh/27/841 : UBV and line identification of V1853 Cyg (Arkhipova+, 2001)
J/PAZh/29/858 : FG Sagittae: new observations (Arkhipova+, 2003)
J/PAZh/30/297 : BVRI + fluxes if HM Sge in 1986-2000 (Arkhipova+, 2004)
J/PAZh/30/855 : UBV light curves of IRAS 19200+3457 (Arkhipova+, 2004)
J/PAZh/32/48 : UBV photometry of HD 331319 (Arkhipova+, 2006)
J/PAZh/32/662 : Photometric Variability of HD 51585 (Arkhipova+, 2006)
J/PAZh/32/737 : UBV light curve and spectroscopy of StHa62 (Arkhipova+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JD Julian date
13- 18 F6.3 mag Umag U magnitude
20- 25 F6.3 mag Bmag B magnitude
27- 32 F6.3 mag Vmag V magnitude
34- 39 F6.3 mag U-B U-B color index
41- 46 F6.3 mag B-V B-V color index
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 7 I7 d JD Julian date
10- 12 F3.1 0.1nm EW(Hb) ? Equivalent widths of Hβ
15- 18 F4.1 0.1nm EW(Ha) ? Equivalent widths of Hα
21- 23 F3.1 0.1nm EW(NII) ? Equivalent widths of [NII] 6584
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(End) Veta Avedisova [INASAN] 30-Dec-2007