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J/A+A/385/884       BVRIJHK photometry of 27 post-AGB candidates  (Fujii+, 2002)

BVRIJHK photometry of post-AGB candidates. Fujii T., Nakada Y., Parthasarathy M. <Astron. Astrophys. 385, 884 (2002)> =2002A&A...385..884F
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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 12µm 33- 37 F5.2 Jy F25um ? Flux density at 25µm 39- 44 F6.2 Jy F60um ? Flux density at 60µm 46- 51 F6.2 Jy F100um ? Flux density at 1002µm 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)
Note (1): Flux density quality: 1 = upper limit 2 = moderate quality 3 = good quality.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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)
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.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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 --- r_SpType [A-K] References (3) 67- 92 A26 ---- Type Object type 98-107 A10 --- Name Name when no IRAS name (only for Seq 27)
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), Cat. III/76 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
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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 (MDust+gas*10-4M_☉/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) 47- 51 I5 pc DV Derived distances assuming MV=Mbol,8000{SUN}-B.C.
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq [1/24] Sequential number 4- 13 A10 --- IRAS IRAS designation 15- 78 A64 --- Note text of the note
Global notes: Note (G1): Seq 27, BD+39 4926, has no IRAS number
History: From electronic version of the journal
(End) Patricia Bauer [CDS] 08-Apr-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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