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J/A+A/385/884 BVRIJHK photometry of 27 post-AGB candidates (Fujii+, 2002)
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BVRIJHK photometry of post-AGB candidates.
Fujii T., Nakada Y., Parthasarathy M.
<Astron. Astrophys. 385, 884 (2002)>
=2002A&A...385..884F (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, giant ; Infrared sources ; Photometry, UBVRI ;
Photometry, infrared
Keywords: stars: AGB and post-AGB - stars: circumstellar matter -
stars: evolution - stars: mass-loss - infrared: stars -
ISM: planetary nebulae: general
Abstract:
BVRIJHK photometric observations are presented for 27 post-AGB
candidates. Almost all objects show a double peaked spatial energy
distribution (SED) curve in the optical to far-infrared wavelengths.
Seventeen objects were classified as post-AGB stars on the basis of
their spectral type, location in the IRAS color-color diagram and SED.
The physical parameters of the observed post-AGB stars, the inner
radius of the detached shell, the mass of the shell and the distance
were derived using the simple dust shell model. We compared our
observational sequence of post-AGB objects to the theoretical
evolutionary sequence (Schoenberner, 1983ApJ...272..708S; Bloecker,
1995, Cat. <J/A+A/299/755>) in the stellar temperatures versus age
diagram. We found that two post-AGB stars, IRAS 05040+4820 and
08187-1905, have low stellar temperature with a large dynamical age of
the dust shell. They appear to provide the first observational
evidence that some low-mass stars bypass the planetary nebulae stage
because of their slow increase in stellar temperature.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 82 27 Infrared properties of candidates from IRAS-PSC
table2.dat 89 34 Photometric observations of Post-AGB candidates
table3.dat 107 27 Central star's properties and extinction
properties
table4.dat 51 16 Derived fitting parameters of each Post-AGB
candidate
notes.dat 78 132 Individual notes
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
J/ApJS/92/125 : Post-AGB evolution (Vassiliadis+, 1994)
J/A+A/299/755 : Stellar evolution. II. Post-AGB (Bloecker+, 1995)
J/A+A/323/469 : Optical spectra of post-AGB stars (Bakker+ 1997)
J/PAZh/26/705 : UBV observations of post-AGB supergiants (Arkhipova+, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/27] Sequential number
3 A1 --- n_Seq [*] *: note in notes.dat file
5- 14 A10 --- IRAS IRAS designation (G1)
16- 25 A10 --- OName SAO or HD name of associated optical object
27- 31 F5.2 Jy F12um ? Flux density at 12{mu}m
33- 37 F5.2 Jy F25um ? Flux density at 25{mu}m
39- 44 F6.2 Jy F60um ? Flux density at 60{mu}m
46- 51 F6.2 Jy F100um ? Flux density at 1002{mu}m
53- 54 I2 --- VAR ? Percent likelihood of variability
56- 60 F5.1 deg GLON Galactic longitude
62- 66 F5.1 deg GLAT Galactic latitude
68 I1 --- q_F12um ? Quality index for F12um (1)
69 I1 --- q_F25um ? Quality index for F25um (1)
70 I1 --- q_F60um ? Quality index for F60um (1)
71 I1 --- q_F100um ? Quality index for F100um (1)
73- 82 A10 --- Name Name of the object (only for Seq 27)
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Note (1): Flux density quality:
1 = upper limit
2 = moderate quality
3 = good quality.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/27] Sequential number
4- 13 A10 --- IRAS IRAS name (G1)
15- 19 F5.2 mag Bmag ? B magnitude (1)
21- 25 F5.2 mag Vmag ? V magnitude (1)
27- 31 F5.2 mag Rcmag ? Cousins R magnitude (1)
33- 37 F5.2 mag Icmag ? Cousins I magnitude (1)
39- 43 F5.2 mag Jmag ? J magnitude (1)
45- 49 F5.2 mag Hmag ? H magnitude (1)
51 A1 --- l_Kmag Limit flag on Kmag
52- 56 F5.2 mag Kmag ? K magnitude (1)
58- 67 A10 "DD/MM/YYYY" DateO Optical observation date
69- 78 A10 "DD/MM/YYYY" DateIR NearIR observation date
80- 89 A10 --- Name Name when no IRAS name (only for Seq 27)
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Note (1): Erros of magnitude:
The errors of magnitude are +/-0.08mag for B,
+/-0.05mag for V, RC and IC,
+/-0.06mag for J,
+/-0.04mag for H,
+/-0.20mag for K.
On Oct. 19/1997, the errors of JHK are
+/-0.18mag, +/-0.12mag and +/-0.38mag, respectively.
On Feb. 26/1997 and Mar. 24/1997, they are
+/-0.15mag, +/-0.06mag and +/-0.20mag, respectively.
The errors were determined by the magnitude deviations of standard
stars.
The large errors of near infrared is due to bad sky conditions.
The large error in K band may be due to the thermal emission from
inside of Schmidt telescope.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/27] Sequential number
4- 13 A10 --- IRAS IRAS name (G1)
15- 22 A8 --- SpType Spectral type
26 A1 --- n_SpType [e] e: Assumption
28 A1 --- ChemType [C] Chemical type, C: carbon-rich object
30- 34 I5 K Tstar ? Stellar temperature
36- 40 F5.2 mag (B-V)0 ? Dereddened (B-V) colour index
42- 46 F5.2 mag (B-V)obs ? Observed (B-V) colour index
48- 52 F5.2 mag E(B-V) ? Reddening
54- 57 F4.2 mag AV1 ? Interstellar extinction derived from
intrinsic and observed B-V (1)
58 A1 --- n_AV1 [f] Note on AV1 (2)
60- 63 F4.2 mag AV2 ? Interstellar extinction derived from
interstellar extinction maps
65 A1 --- Ref [A-K] References (3)
67- 92 A26 ---- Type Object type
98-107 A10 --- Name Name when no IRAS name (only for Seq 27)
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Note (1): Absorption, derived from intrinsic and observed B-V, it contains
interstellar and circumstellar extinction
Note (2): f: We assumed AV=0.0, since (B-V)obs < (B-V)0
Note (3): References for spectral types
A: Meixner et al., 1999, Cat. <J/ApJS/122/221>
B: Hrivnak, 1995ApJ...438..341H
C: Hardorp et al., 1959, in Luminous Stars in the Northern
Milky Way (Hamburg-Bergedorf)
D: Zuckerman et al., 1995Natur.373..494Z
E: Reddy and Parthasarathy, 1996AJ....112.2053R
F: Parthasarathy, 1993, ASP Conf. Ser. 45, 173
G: SIMBAD database
H: van den Ancker et al., 1998A&A...330..145V
I: Scarrott et al., 1990MNRAS.245..484S
J: Vijapurkar et al., 1998BASI...26..487V
K: Hrivnak and Kwok, 1999ApJ...513..869H
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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- 2 I2 --- Seq Sequential number
4- 13 A10 --- IRAS IRAS name
15- 19 I5 K Tstar Stellar temperature
21- 23 I3 K Tdust Dust temperature
25- 28 I4 yr tdyn Dynamical time
30- 34 F5.3 solMass dM/dt Dust+gas mass-loss rate
(M_Dust+gas_*10^-4^M_{sun}/yr)
36- 39 F4.2 mag AV3 Interstellar extinction derived from the
model fitting.
41- 45 I5 pc Dfit Derived distances using the model fitting
(L=8000L_{sun}_)
47- 51 I5 pc DV Derived distances assuming
M_V_=M_bol,8000{SUN}_-B.C.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/24] Sequential number
4- 13 A10 --- IRAS IRAS designation
15- 78 A64 --- Note text of the note
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Global notes:
Note (G1): Seq 27, BD+39 4926, has no IRAS number
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History:
From electronic version of the journal
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(End) Patricia Bauer [CDS] 08-Apr-2002