J/A+A/387/129 IR observations of S stars (Wang+, 2002)
Near-infrared observations of candidate extrinsic S stars.
Wang X.-H., Chen P.-S.
<Astron. Astrophys. 387, 129 (2002)>
=2002A&A...387..129W 2002A&A...387..129W
ADC_Keywords: Stars, late-type ; Stars, S ; Infrared sources ;
Photometry, infrared
Keywords: stars: AGB and post-AGB - stars: evolution -
stars: circumstellar matter - infrared: stars
Abstract:
Photometric observations in the near infrared for 161 S stars,
including 18 Tc-rich (intrinsic) stars, 19 Tc-deficient (extrinsic)
ones and 124 candidates for Tc-deficient S stars, are presented in
this paper. Based on some further investigations into the infrared
properties of both Tc-rich and Tc-deficient S stars, 104 candidates
are identified as very likely Tc-deficient S stars. The large number
of infrared-selected Tc-deficient S stars provides a convenient way to
study the physical properties and the evolutionary status of this
species of S stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 34 81 α12 values of the S stars whose Tc
contents are well known.
table2.dat 99 40 Observed S stars whose Tc contents have been
well known.
table3.dat 101 131 Observed candidates for Tc-deficient S stars
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See also:
III/168 : General Catalog of S Stars, second edition (Stephenson 1984)
III/197 : IRAS Low Resolution Spectra (IRAS team, 1987)
J/AZh/76/604 : Spectrophotometry of S and carbon stars (Tereshchenko, 1999)
J/A+A/333/952 : BVRI photometry of HR 1105 (Adelman 1998)
J/A+AS/113/51 : Catalogue of associations IRAS and S stars (Chen+, 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- TcType [ab] a: Tc-deficient S stars (extrinsic)
b: Tc-rich S stars (intrinsic)
3- 11 A9 --- Name Star name (G1)
13- 22 A10 --- IRAS IRAS designation
23 A1 --- Note [a] a: In a region of the sky not surveyed
by IRAS
24- 27 F4.2 --- alpha12 ? Spectral slope between the 12 and 25µm (1)
29- 33 A5 --- LRS LRS classification
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Note (1): Spectral slope between the 12 and 25µm:
alpha12 = log(25F12/12F25)/log(25/12), where
F12 and F25 are fluxes in Jy at 12 and 25µm respectively.
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1 A1 --- TcType [abc] a: Tc-deficient S star
b: Tc-rich S star
c: candidates for Tc-deficient S star
3- 11 A9 --- Name Star name (G1)
13- 22 A10 --- IRAS IRAS designation
23 A1 --- Note [a] a: In a region of the sky not surveyed by
IRAS.
25- 34 A10 "YYYY/MM/DD" Date Observation date
36- 39 F4.1 mag Vmag ? V or B magnitude
40 A1 --- n_Vmag [BIv] B: B magnitude in Vmag
I: I magnitude in Vmag
v: variable
42- 46 F5.2 mag Jmag J magnitude
48- 52 F5.2 mag Hmag H magnitude
54- 58 F5.2 mag Kmag K magnitude
60- 66 F7.3 Jy F12um ? Flux at 12µ
68- 74 F7.3 Jy F25um ? Flux at 25µ
76- 81 F6.3 Jy F60um ? Flux at 60µ
83- 88 F6.3 Jy F100um ? Flux at 100µ
90- 94 A5 --- LRS LRS classification
96- 98 A3 --- f_CIO JHK flags (1)
100-101 A2 --- Tc [n:? ] Tc deficient status for candidates (2)
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Note (1): Catalog of Infrared Observations (Gezari et al., 1993, see
Cat. II/225) set of symbols for J, H and K band respectively.
*: there is no observation appearing in CIO catalog
v: there is a difference of more than 0.2 between the present
measurement and one of the previous data in CIO
JHK: the CIO magnitudes at the corresponding band do not differ by
more than 0.2 from the value here
Note (2): Judgement on a star as a Tc-deficient S star:
n - the star should be Tc-deficient as judged by
the (K-[12])-([12]-[25]) diagram
n: - states that judgement for Tc-deficiency is made only by the
K-[12] histogram due to the lack of the flux at 25µm
n? - star that has the proper K-[12] color as a Tc-deficient S star
but does not lie in the area populated by Tc-deficient stars in
the (K-[12])-([12]-[25]) plot and should not taken as a good
candidate of Tc-deficient S stars.
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Global notes:
Note (G1): Names:
SNNNN: CSS NNNN in Simbad, Stephenson, 1984, Cat. III/168
SfNN : CSS2 NN in Simbad, Stephenson, 1990AJ....100..569S 1990AJ....100..569S
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History:
Prepared via OCR at CDS.
* 02-Dec-2002: Tables 1 and 2, name of star IRAS 19323+4909
corrected to V1743 Cyg (instead of V1743 Peg)
References:
Chen et al., Paper I 1998A&A...333..613C 1998A&A...333..613C
(End) James Marcout, Patricia Bauer [CDS] 30-May-2002