J/AJ/149/184 Long-term photometry for 4 O-rich PPne (Hrivnak+, 2015)
Variability in proto-planetary nebulae. IV. Light curve analysis of four
oxygen-rich, F spectral type objects.
Hrivnak B.J., Lu W., Nault K.A.
<Astron. J., 149, 184 (2015)>
=2015AJ....149..184H 2015AJ....149..184H
ADC_Keywords: Planetary nebulae ; Stars, giant ; Photometry, UBVRI
Keywords: planetary nebulae: general - stars: AGB and post-AGB -
stars: oscillations - stars: variables: general
Abstract:
We present new light curves covering 14-19years of observations of
four bright proto-planetary nebulae (PPNs), all oxygen-rich and of F
spectral type. They each display cyclical light curves with
significant variations in amplitude. All four were previously known to
vary in light. Our data were combined with published data and searched
for periodicity. The results are as follows: IRAS 19475+3119
(HD331319; 41.0days), 17436+5003 (HD161796; 45.2days), 19386+0155
(101.8days), and 18095+2704 (113.3days). The two longer periods are in
agreement with previous studies while the two shorter periods each
reveal for the first time a dominant period over these long observing
intervals. Multiple periods were also found for each object. The
secondary periods were all close to the dominant periods, with
P2/P1 ranging from 0.86 to 1.06. The variations in color reveal
maximum variations in Teffof 400-770K. These variations are due to
pulsations in these post-asymptotic giant branch objects. Maximum
seasonal light variations are all less than 0.23mag (V), consistent
for their temperatures and periods with the results of Hrivnak et al.
for 12 C-rich PPNs. For all of these PPNs, there is an inverse
relationship between period and temperature; however, there is a
suggestion that the period-temperature relationship may be somewhat
steeper for the O-rich than for the C-rich PPNs.
Description:
Photometric observations for our four objects (IRAS17436+5003,
IRAS18095+2704, IRAS19386+0155, and IRAS19475+3119) were carried out
at the Valparaiso University Observatory (VUO) using the 0.4m
telescope and a CCD detector. They began in 1994 and continue through
the present time; those reported in this study run through 2012,
except for IRAS19386+0155, for which we stopped observations in 2007.
Initial observations were made primarily through the V filter, with
some occasionally through the RC filter, but the frequency of RC
observations increased and since 2000 they they have been made
together. Unfortunately a problem developed with the V filter which
caused us to reject the V data from the 2000 and 2001 seasons and part
of 2002. This led to a gap in each of the V light curves. Beginning in
2007, B observations were also made for all of the sources except
IRAS19386+0155. In 2008 we upgraded from a Photometric Star I CCD,
with a field of view of 8.6'*5.7', to an SBIG 6303 CCD, with a field
of view of 17.9'*11.9'. Filter sets were used with each to match the
standard Johnson B and V and Cousins Rc systems.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 84 955 Differential standard VRc magnitudes and colors
for the four Proto-Planetary Nebulae (PPNs) from
1994 to 2007
table5.dat 47 811 Differential standard BVRc magnitudes for the
four proto-planetary nebulae (PPNs) from 2007-2012
table8.dat 85 4 Results of the period and light curve study of
four oxygen-rich Proto-Planetary Nebulae (PPNs)
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See also:
J/ApJ/766/116 : Variability in proto-PNe. II. (Hrivnak+, 2013; Paper II)
J/ApJ/709/1042 : Variability in C-rich proto-PNe. (Hrivnak+, 2010; Paper I)
J/PAZh/32/48 : UBV photometry of HD 331319 (Arkhipova+, 2006)
J/A+A/458/173 : Optical spectroscopy of 253 IRAS sources (Suarez+, 2006)
J/A+AS/126/479 : NIR photometry of IRAS sources. III (Garcia-Lario+, 1997)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [IRAS]
6- 15 A10 --- IRAS IRAS name of the program star (17436+5003,
18095+2704, 19386+0155, or 19475+3119) (1)
21- 30 F10.4 d HJD-V V-band Heliocentric Julian Date (HJD-2400000)
33- 38 F6.3 mag DVmag Differential V-band magnitude (2)
44- 53 F10.4 d HJD-R ? Rc-band Heliocentric Julian Date (HJD-2400000)
56- 61 F6.3 mag DRmag ? Differential Rc-band magnitude (2)
67- 76 F10.4 d HJD-V-R ? V-Rc Heliocentric Julian Date (HJD-2400000)
79- 84 F6.3 mag D(V-R) ? Differential (V-Rc) color index (2)
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Note (1): The 2007 observations that contain all three BVRc filters are listed
instead in Table 5.
Note (2): Average uncertainties in the brightness are DVmag=±0.006,
DRmag=±0.005 and D(V-R)=±0.004, with maximum uncertainties ∼2 times as
great. A problem developed with the V filter which caused us to reject the
V data from the 2000 and 2001 seasons and part of 2002. This led to a gap
in each of the V light curves.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [IRAS]
6- 15 A10 --- IRAS IRAS name of the program star (17436+5003,
18095+2704, or 19475+3119) (1)
17- 26 F10.4 d HJD Heliocentric Julian Date (HJD-2400000) (2)
28- 33 F6.3 mag DBmag ? Differential B band magnitude (3)
35- 40 F6.3 mag DVmag ? Differential V band magnitude (3)
42- 47 F6.3 mag DRmag ? Differential Rc band magnitude (3)
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Note (1): The 2007 observations that contain only VRc filters are listed
instead in Table 4.
Note (2): The time represents the mid-time of the V observations. The times
for the B and Rc observations differ from this by approximately:
IRAS 17436+5003: +0.0011 and -0.0012 days, respectively;
IRAS 18095+2704: +0.0027 and -0.0018 days, respectively;
IRAS 19475+3119: +0.0021 and -0.0017 days, respectively.
Note (3): Average uncertainties in the brightness are DBmag=±0.005,
DVmag=±0.005 and DRmag=±0.004, with maximum uncertainties ∼2 times as
great.
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- IRAS IRAS name of the program star
12- 16 F5.1 d Per1 [41/114] Main Period
18- 21 F4.2 --- P2/P1 [0.8/1.1] The period 2 to period 1 ratio
23 A1 --- r_Pprev Reference for Pprev (1)
25- 30 A6 d Pprev Previously published period(s)
32- 36 A5 --- SpT Spectral type
38- 41 I4 K Teff1 Effective temperature (2)
42 A1 --- --- [,]
43- 46 I4 K Teff2 ? Second effective temperature (2)
48- 51 F4.2 mag DVmag ΔV-band magnitude (3)
53- 57 F5.3 mag D(V-R) Δ(V-Rc) color index (2)
59- 63 F5.3 mag D(B-V) Δ(B-V) color index (2)
65- 67 I3 K DTeff ΔTeff with previous values (2)
69- 85 A17 --- Com Comments
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Note (1): Reference codes are defined as follows:
1 = Fernie, series of papers (1983ApJ...265..999F 1983ApJ...265..999F, 1986ApJ...306..642F 1986ApJ...306..642F,
1989PASP..101..171F 1989PASP..101..171F, 1990PASP..102..442F 1990PASP..102..442F, 1990PASP..102.1143F 1990PASP..102.1143F,
1991PASP..103.1087F 1991PASP..103.1087F);
2 = Arkhipova et al. 2010 (cat. J/PAZh/36/281);
3 = Arkhipova et al. 2006 (cat. J/PAZh/32/48).
Note (2): Determined from model atmosphere analyses as cited in Table 1
(see the paper).
Note (3): The maximum brightness and color range observed in a season and the
corresponding maximum temperature change based on Δ(B-V) and
color-temperature calibration of Cox (2000S&T...100a..72C 2000S&T...100a..72C, Table 15.7).
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History:
From electronic version of the journal
References:
Hrivnak et al. Paper I. 2010ApJ...709.1042H 2010ApJ...709.1042H Cat. J/ApJ/709/1042
Hrivnak et al. Paper II. 2013ApJ...766..116H 2013ApJ...766..116H Cat. J/ApJ/766/116
Hrivnak et al. Paper III. 2015ApJ...805...78H 2015ApJ...805...78H
Hrivnak et al. Paper IV. 2015AJ....149..184H 2015AJ....149..184H This catalog
Hrivnak et al. Paper V. 2018AJ....156..300H 2018AJ....156..300H Cat. J/AJ/156/300
Hrivnak et al. Paper VI. 2020AJ....159...21H 2020AJ....159...21H Cat. J/AJ/159/21
Hrivnak et al. Paper VII. 2020ApJ...901....9H 2020ApJ...901....9H Cat. J/ApJ/901/9
Hrivnak et al. Paper VIII. 2021AJ....162..248H 2021AJ....162..248H
Hrivnak et al. Paper IX. 2022ApJ...939...32H 2022ApJ...939...32H Cat. J/ApJ/939/32
Hrivnak et al. Paper X. 2024AJ....167...30H 2024AJ....167...30H Cat. J/AJ/167/30
(End) Greg Schwarz [AAS] Sylvain Guehenneux [CDS] 17-Jun-2015