J/A+A/227/82 JHKLM photometry of 'IRAS-discovered' stars (Epchtein+, 1990)
Carbon star envelopes: near-IR photometry, mass loss and evolutionary status of
a sample of IRAS stars.
Epchtein N., Le Bertre T., Lepine J.R.D.
<Astron. Astrophys. 227, 82 (1990)>
=1990A&A...227...82E 1990A&A...227...82E
ADC_Keywords: Stars, carbon ; Infrared sources ; Photometry, infrared
Keywords: infrared radiation - stars: carbon - stars: circumstellar -
stars: evolution of - stars: mass loss
Abstract:
This paper presents results of JHKLM photometry data analysis of 249
southern 'IRAS-discovered' stars, which exhibit an emission feature at
11.3 microns in their low-resolution spectra (class 4n stars). The
method of Epchtein et al. (1987A&AS...71...39E 1987A&AS...71...39E) is used to separate
oxygen-rich and carbon-rich stars on the basis of their sole NIR and
IRAS broad-band fluxes. It is shown that NIR data are necessary to
calculate the total IR energy received from IRAS stars and such
fundamental parameters as individual mass loss rates. An evolutionary
model is developed to match the sequence of stars in color diagrams.
It is suggested that the sequence of increasing optical depths might
not be an evolutionary sequence, but would rather reflect the
termination of a process in which the near-IR index increases very
quickly at the beginning and is strongly dependent on the mass loss
rate.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1a.dat 62 249 JHKLM photometry
table3.dat 82 249 IRAS photometry
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
II/177 : Near IR Photometry of IRAS point sources sample (Fouque+ 1992)
III/197 : IRAS Low Resolution Spectra (IRAS team, 1987)
J/A+A/334/609 : Carbon stars IR photometry (Guglielmo+ 1998)
J/A+AS/99/31 : Identification of C stars in IRAS (Guglielmo+ 1993)
J/A+AS/122/489 : New infrared carbon stars in IRAS PSC (Guglielmo+ 1997)
Byte-by-byte Description of file: table1a.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [ELL90] Sequential number
5- 14 A10 --- IRAS IRAS Number
16- 21 F6.2 deg GLON Galactic longitude
23- 28 F6.2 deg GLAT Galactic latitude
30 I1 --- Ep [1/5] Epoch of observation (1)
32- 36 F5.2 mag Jmag ? J magnitude (1.2um)
38- 42 F5.2 mag Hmag ? H magnitude (1.6um)
44- 48 F5.2 mag Kmag K magnitude (2.2um)
50- 54 F5.2 mag Lmag ? L magnitude (3.5um)
56- 60 F5.2 mag Mmag ? M magnitude (5.0um)
62 A1 --- ID [*] *: Object previously reported (2)
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Note (1): Epochs of observations:
1: September 1985
2: January 1986
3: April 1986
4: March 1987
5: June 1986
Note (2): Object previously reported in an optical or an infrared catalog
(IRC, AFLG or EIC) or recently optically identified.
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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- 3 I3 --- [ELL90] Sequential number
5- 14 A10 --- IRAS IRAS number
16- 20 F5.2 mag K0mag Dereddened K magnitude
22- 25 F4.2 mag (K-L)0 ? Dereddened K-L colour index
27- 30 F4.2 mag L0-[12] ? L0-[12] colour index
32- 36 F5.2 mag [12] IRAS magnitude at 12um (6)
38- 42 F5.2 mag [12-25] ? IRAS [12-25] colour index (6)
44- 48 F5.2 mag [25-60] ? IRAS [25-60] colour index (6)
50- 53 F4.1 kpc Dist ? Bolometric distance
55- 59 F5.1 --- BCK ? Bolometric correction the flux at K (7)
61- 65 F5.1 --- BC12 ? Bolometric correction the flux at 12um (7)
67- 68 I2 --- LRS [41/49] LRS code (see Cat. III/197)
70- 71 A2 --- Type [Cabc o23] Code which refers to the
classification of Epchtein et al.
(1987A&AS...71...39E 1987A&AS...71...39E) (1)
73 A1 --- Id [OI] Object identification (2)
75- 77 A3 --- Note (+:N) Note (3)
79 I1 --- CO ? Reference to position detection in a
CO millimetre line (4)
81- 82 A2 --- Var [OV ?] Variability (5)
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Note (1): Code:
a: star located around K-L=0.2 and L-[12um]=0.5 and defined by L-[12um]<0.8
b: star defined by 0.2<K-L<0.7 and 0.8<L-[12um]<2
c: carbon-rich star
o2: star with K-L<1.4
o3: oxygen-rich star (K-L>1.4)
Note (2): Objects identified with an optical or a previously known IR star
are indicated with letters "O" or "I", respectively
Note (3): Notes:
- indicates that the star is probably not a carbon star for
various reasons detailed in the notes.
1: The LRS has a low signal to noise ratio, Unless they are
identified with an optical carbon star or classified in our "c"
type (then in both cases, the note is preceded by a sign "+"),
such stars are eliminated of our purified sample
2: IRAS 07568-3226 (=IRC-30108) has a LRS which shows a definite
SiC feature, although it is identified by IRAS and the TMSS with
SAO 198658 (=CD-324654), a star classified (probably by error
or confusion) as of spectral type A0
3: Planetary nebula (PK 174+2.1), the LRS exhibits emission lines
4: The LRS shows a 18µm feature probably due to silicate grain
emission, the dip at 9.6µm is more likely to be due to a
silicate absorption rather than to an adjacent SiC emission
at 11.6µm. These objects are more probably oxygen-rich
stars and are eliminated of our purified sample of carbon stars.
5: IRAS 15163-5325 has an unusual LRS
6: Spike in the LRS (see case of IRAS 17599-4556 in de Muizon et al.
1988A&A...203..207J 1988A&A...203..207J), IRAS 13595-5254 is probably a true carbon star.
7: Detected in the 2.2µm Valinhos survey (Epchtein et al.,
1987A&AS...71...39E 1987A&AS...71...39E). IRAS 16103-4929 is not optically identified
in the PSC although it coincides with (CD-49 10420), which is
classified as a M star
8: OH/IR source detected in the Arecibo survey
(Eder et al., 1988ApJS...66..183E 1988ApJS...66..183E)
9: S star
Note (4): References:
1: Nguyen-Quang-Rieu et al., 1987A&A...180..117N 1987A&A...180..117N
2: Zuckerman & Dick, 1986ApJ...311..345Z 1986ApJ...311..345Z
3: Lehay et al., 1987ApJ...320..825L 1987ApJ...320..825L
4: Olofsson et al., 1988, Space Sci. Rev. 47, 145
5: Olofsson et al., 1987A&A...183L..13O 1987A&A...183L..13O
6: Knapp et al., 1989ApJ...336..822K 1989ApJ...336..822K
Note (5): Information on the variability of the star as reported
in the IRAS PSC.
(V, ?, ?? and 0) are used for IRAS variability larger than 80%,
between 80 and 10%, between 10 and 0 (excluded) and 0, respectively.
Note (6): The zero magnitude fluxes at 12, 25 and 60um are 28.3, 6.73
and 1.19Jy, respectively.
Note (7): The bolometric correction are defined following van der Veen and
Breukers, 1989A&A...213..133V 1989A&A...213..133V, BC(nu)=F/(nu*Fnu)
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Acknowledgements: Nicolas Epchtein
(End) Patricia Bauer [CDS] 23-Oct-2003