J/PAZh/36/281 Variability of 3 protoplanetary nebulae (Arkhipova+, 2010)
Pulsations and long-term photometric variability of three candidates
for protoplanetary nebulae
Arkhipova V.P., Ikonnikova N.P.
<Pis'ma Astron. Zh., 36, 281 (2010)>
=2010PAZh...36..281A 2010PAZh...36..281A
=2010AstL...36..269A 2010AstL...36..269A
ADC_Keywords: Stars, supergiant; Photometry, UBV
Abstract:
We present new photometric data and analyze long-term UBV observations
of three candidates for protoplanetary nebulae - F supergiants with
infrared excesses at high Galactic latitudes -IRAS 18095+2704,
IRAS 19386+0155, and IRAS 19500-1709. All these stars exhibit
quasi-periodic low-amplitude variations caused by pulsations against
the background of long-term brightness trends. For IRAS 18095+2704 =
V887 Her, we have found a pulsation period of 109 days and revealed a
linear brightness trend - the star brightens at constant (within the
limits of the measurement errors) yearly mean color indices. The light
curve of IRAS 19386+0155 = V1648 Aql in 2000-008 is represented by a
wave with a fundamental period of 102 days whose modulation with a
close period of 98 days leads to variations with a variable amplitude.
V1648 Aql also shows a systematic rise in V brightness along with a
reddening. IRAS 19500-1709 = V5112 Sgr exhibits irregular pulsations
with periods of 39 and 47 days. The long-term variability component of
V5112 Sgr may indicate that the star is binary.
Objects:
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RA (2000) DE Designation(s) (file)
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18 11 30.7 +27 05 16 V887 Her = V* V887 Her (table2.dat)
19 41 08.3 +02 02 31 V1648 Aql = V* V1648 Aql (table3.dat)
19 52 52.7 -17 01 50 V5112 Sgr = V* V5112 Sgr (table4.dat)
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File Summary:
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File Name Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 28 211 V887 Her UBV-observations in 2000-2008
table3.dat 28 160 V1648 Aql UBV-observations in 2000-2008
table4.dat 28 161 V5112 Sgr UBV-observations in 2000-2008
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Table1: Program objects
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IRAS HD GCVS b SpType Teff logg [Fe/H]
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18092+2704 - V887 Her +20.2 F3Ib (1) 6600 (2) 1.05 (2) -0.78 (2)
19386+0155 - V1648 Aql -10.1 F5I (3) 6800 (4) 1.4 (4) -1.1 (4)
19500-1709 187885 V5112 Sgr -21.0 F0I (3) 8000 (5) 1.0 (5) -0.6 (5)
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Notes:
(1): Hrivnak et al. (1988ApJ...331..832H 1988ApJ...331..832H)
(2): Klochkova (1995MNRAS.272..710K 1995MNRAS.272..710K)
(3): Suarez et al. (2006, Cat. J/A+A/458/173)
(4): Pereira et al. (2004A&A...422..637P 2004A&A...422..637P)
(5): Van Winckel and Reyniers (2000A&A...354..135V 2000A&A...354..135V)
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Byte-by-byte Description of file: table[234].dat
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Bytes Format Units Label Explanations
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1- 7 I7 d JD Julian date
9- 14 F6.3 mag Vmag V magnitude
17- 21 F5.3 mag B-V B-V color index
24- 28 F5.3 mag U-B U-B color index
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Table5: Pulsation periods of V5112 Sgr
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Year P,days(ASAS) P,days(our data)
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2001 47.6,39.0 47.0
2002 46.1 -
2003 39.1 38.6
2004 39.1 -
2005 - 38.5
2006-2008 - 38.0
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(End) Veta Avedisova [INASAN] 20-Oct-2011