J/ApJ/766/116 Variability in proto-PNe. II. (Hrivnak+, 2013)
Studies of variability in proto-planetary nebulae.
II. Light and velocity curve analyses of IRAS 22272+5435 and 22223+4327.
Hrivnak B.J., Lu W., Sperauskas J., Van Winckel H., Bohlender D., Zacs L.
<Astrophys. J., 766, 116 (2013)>
=2013ApJ...766..116H 2013ApJ...766..116H
ADC_Keywords: Stars, giant ; Stars, carbon ; Planetary nebulae ;
Photometry, VRI ; Radial velocities
Keywords: planetary nebulae: general; stars: AGB and post-AGB;
stars: individual (IRAS 22223+4327, IRAS 22272+5435);
stars: oscillations; stars: variables: general
Abstract:
We have carried out a detailed observational study of the light,
color, and velocity variations of two bright, carbon-rich
proto-planetary nebulae, IRAS 22223+4327 and 22272+5435. The light
curves are based upon our observations from 1994 to 2011, together
with published data by Arkhipova and collaborators. They each display
four significant periods, with primary periods for IRAS 22223+4327 and
22272+5435 being 90 and 132 days, respectively. For each of them, the
ratio of secondary to primary period is 0.95, a value much different
from that found in Cepheids, but which may be characteristic of
post-asymptotic giant branch (AGB) stars. Fewer significant periods
are found in the smaller radial velocity data sets, but they agree
with those of the light curves. The color curves generally mimic the
light curves, with the objects reddest when faintest. A comparison in
seasons when there exist contemporaneous light, color, and velocity
curves reveals that the light and color curves are in phase, while the
radial velocity curves are ∼0.25 P out of phase with the light curves.
Thus they differ from what is seen in Cepheids, in which the radial
velocity curve is 0.50 P out of phase with the light curve. Comparison
of the observed periods and amplitudes with those of post-AGB
pulsation models shows poor agreement, especially for the periods,
which are much longer than predicted. These observational data,
particularly the contemporaneous light, color, and velocity curves,
provide an excellent benchmark for new pulsation models of cool stars
in the post-AGB, proto-planetary nebula phase.
Description:
New differential photometric observations were carried out at the
Valparaiso University Observatory (VUO) during the four seasons from
2008-2009 to 2011-2012. These complement the earlier observations
carried out at the VUO from 1994 through 2007 (Paper I: Hrivnak+,
2010, Cat. J/ApJ/709/1042).
Arkhipova et al. (1993AstL...19..169A 1993AstL...19..169A, 2000, J/PAZh/26/705) have
published photometric studies of IRAS 22272+5435 from 1991 to 1999 and
made their UBV data available publicly, which consist of 89
observations in each filter.
Arkhipova et al. (2003AstL...29..480A 2003AstL...29..480A, 2011, J/PAZh/37/691) have
published photometric studies of IRAS 22223+4327 from 1999 to 2002,
consisting of 56 observations in each of the UBV filters, and from
2003 to 2010, consisting of 134 observations in each filter.
The radial velocity observations for this program were initially made
at the Dominion Astrophysical Observatory (DAO) with the 1.2m
telescope used at the Coude focus. Observations were made in two
observing intervals: 1991 to 1995 with the radial velocity
spectrometer (RVS, from 4000 to 4600Å), and 2007 to 2011 from
high-resolution CCD spectra in the wavelength interval from 4350 to
4500Å.
Radial velocity observations of IRAS 22272+5435 were initiated in 2005
using the CORAVEL spectrometer of Vilnius University. Additional
observations of IRAS 22223+4327 were initiated in 2008 with the
CORAVEL spectrometer mounted on the 1.65m telescope at the Moletai
Observatory (Lithuania) over the spectral interval 3850-6400Å with
a with a ∼0.6-0.7km/s precision.
Additional radial velocity observations for both objects were also
made from 2009 to 2011 with the fiber-fed echelle spectrograph Hermes
on the 1.2m Flemish Mercator telescope at La Palma in 3900-9000Å
with a spectral resolution of R∼85000.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 45 2 Program objects
table3.dat 34 177 Differential standard magnitudes for IRAS 22223+4327
table4.dat 34 179 Differential standard magnitudes for IRAS 22272+5435
table5.dat 27 178 Radial velocity observations of IRAS 22223+4327
table6.dat 27 202 Radial velocity observations of IRAS 22272+5435
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See also:
J/ApJS/211/15 : SiO & H2O maser survey toward AGB+post-AGB stars (Yoon+, 2014)
J/PAZh/37/691 : V340 Ser and V448 Lac light curves (Arkhipova+, 2011)
J/AZh/88/34 : Long-term (1984-2008) JHKLM phot. of stars (Shenavrin+, 2011)
J/ApJ/709/1042 : Variability in C-rich proto-PNe. (Hrivnak+, 2010)
J/PAZh/36/281 : Variability of 3 protoplanetary nebulae (Arkhipova+, 2010)
J/other/PZ/29.1 : UBV light curves of V354 Lac (Arkhipova+, 2009)
J/A+A/469/799 : Torun catalog of post-AGB & related objects (Szczerba+, 2007)
J/A+A/458/173 : Optical spectroscopy of 253 IRAS sources (Suarez+, 2006)
J/A+A/431/565 : Evolved stars in the MSX survey (Ortiz+, 2005)
J/PAZh/26/705 : UBV observations of post-AGB supergiants (Arkhipova+, 2000)
J/A+A/323/469 : Optical spectra of post-AGB stars (Bakker+ 1997)
J/A+A/299/755 : Stellar evolution. II. Post-AGB (Bloecker+, 1995)
J/A+A/267/515 : Very cold C-rich circumstellar envelopes (Omont+ 1993)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- IRAS IRAS identifier (HHMMm+DDMM; B1950)
12- 14 F3.1 mag Vmag [8.6/9.8] V-band magnitude (variable)
16- 19 F4.2 mag V-Rc [0.5/1.1] V-Rc color index (variable) (1)
21- 25 A5 --- SpT MK spectral type
27- 30 I4 K Teff [5750/6500] Effective temperature
32- 34 F3.1 [cm/s2] logg [0.5/1] Surface gravity
36- 39 F4.1 [Sun] [Fe/H] [-0.8/-0.3] Abundance [Fe/H]
41- 43 F3.1 --- C/O [1.2/1.6] C/O abundance ratio
45 I1 --- Ref [1/2] Reference number (2)
--------------------------------------------------------------------------------
Note (1): Includes circumstellar and interstellar reddening.
Note (2): References for the spectroscopic analyses as follows:
1 = Van Winckel & Reyniers 2000A&A...354..135V 2000A&A...354..135V
2 = Reddy et al. 2002ApJ...564..482R 2002ApJ...564..482R
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Byte-by-byte Description of file: table[34].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d HJD Heliocentric Julian Date; HJD-2400000 (1)
13- 18 F6.3 mag dBmag ? Differential Magnitude in B
21- 26 F6.3 mag dVmag ? Differential Magnitude in V
29- 34 F6.3 mag dRmag ? Differential Magnitude in R; Cousins
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Note (1): The time represents the mid-time of the V observations.
The times for the B and Rc observations differ from this by
approximately +0.0034 and -0.0020 day, respectively for IRAS
22223+4327; and by approximately +0.0025 and -0.0010 day,
respectively for IRAS 22272+5435.
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Byte-by-byte Description of file: table[56].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Inst Instrument
9 A1 --- n_Inst [a] a=Observations made by R. D. McClure
using a K-star mask
11- 20 F10.4 d HJD Heliocentric Julian Date; HJD-2400000
22- 27 F6.2 km/s HRV [-47.4/-33.7] Radial velocity
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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 This catalog
Hrivnak et al. Paper III. 2015ApJ...805...78H 2015ApJ...805...78H
Hrivnak et al. Paper IV. 2015AJ....149..184H 2015AJ....149..184H Cat. J/AJ/149/184
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], Emmanuelle Perret [CDS] 13-Nov-2014