J/A+A/403/943 Mass-loss rates of galactic AGB stars (Le Bertre+, 2003)
Galactic mass-losing AGB stars probed with the IRTS. II.
Le Bertre T., Tanaka M., Yamamura Y., Murakami H.
<Astron. Astrophys. 403, 943 (2003)>
=2003A&A...403..943L 2003A&A...403..943L
ADC_Keywords: Stars, carbon ; Mass loss ; Infrared sources ; Stars, distances
Keywords: stars: carbon - stars: mass-loss - stars: AGB and post-AGB -
ISM: evolution - galaxy: solar neighbourhood - infrared: stars
Abstract:
We are using the 2002 data-release from the Japanese space experiment
IRTS to investigate the spatial distribution of galactic mass-losing
(>2x10^-8M☉_/yr) AGB stars and the relative contribution of
C-rich and O-rich ones to the replenishment of the ISM. Our sample
contains 126 C-rich and 563 O-rich sources which are sorted on the
basis of the molecular bands observed in the range 1.4-4.0µm, and
for which we estimate distances and mass loss rates from near-infrared
photometry (K and L'). There is a clear dependence on galactocentric
distance, with O-rich sources outnumbering C-rich ones for
τGC<8kpc, and the reverse for τGC>10kpc. The contribution
to the replenishment of the ISM by O-rich AGB stars relative to C-rich
ones follows the same trend. Although they are rare (∼10% in our
sample), sources with 10-6M☉/yr<dM/dt<10-5M☉/yr
dominate the replenishment of the ISM by contributing to ∼50% of the
total of the complete sample. We find 2 carbon stars at more than 1kpc
from the Galactic Plane, that probably belong to the halo of our
Galaxy.
Description:
We use the 2002 data release described in Yamamura et al. (2003,
Exploiting the ISO Data Archive Infrared Astronomy in the Internet
Age, ed. C. Gry, S. Peschke, J. Matagne, et al., ESA SP 511, 35).
The IRTS data and explanatories are available via DARTS archive,
at URL http://www.darts.isas.ac.jp/
The supplementary tables (table3s.dat and table4s.dat), not included
in the original paper, contain more accurate positions essentially
gathered by B. Skiff (Lowell Obs.)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 84 126 Properties of the 126 C-rich sources
table3s.dat 147 126 *Additional positions and cross-identifications
table4.dat 84 563 Properties of the 563 O-rich sources
table4s.dat 135 563 *Additional positions and cross-identifications
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Note on table3s.dat, table4s.dat: positional data and cross-identifications
added by B. Skiff (Lowell Obs.). These data, not existing in the
original paper, were added mainly from a comparison with the 2MASS
images and catalog (Cat. II/246)
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See also:
http://www.darts.isas.ac.jp/irts/ : InfraRed Telescope in Space
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/A+A/376/997 : Galactic mass-losing AGB stars. I. (Le Bertre+, 2001)
J/A+A/314/896 : IR fluxes and photometry of O-rich stars (Le Sidaner+ 1996)
J/A+A/324/1059 : C-rich stars IR and UBVRI photometry (Le Bertre 1997)
J/A+A/334/609 : Carbon stars IR photometry (Guglielmo+ 1998)
J/A+AS/97/729 : JHKL'M Observations of O-rich late-type star (Le Bertre 1993)
J/A+AS/99/31 : Identification of C stars in IRAS (Guglielmo+ 1993)
Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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2- 11 A10 --- NIRS NIRS PSC name (IRAS conventions, B1950)
13 A1 --- n_NIRS [NS] N for North-scan, S for South-scan
17- 26 A10 --- IRAS IRAS name of associated source
30- 31 I2 --- N Number of events used for this entry
35- 39 F5.2 mag Kmag K magnitude in the ESO system
43- 47 F5.2 mag K-L' K-L' colour index
51- 56 F6.0 pc Dist Heliocentric Distance
60- 65 F6.0 pc Zdist Distance to the Galactic Plane
69- 74 F6.2 kpc Rdist Distance to the Galactic Center
(projected on the Galactic Plane)
78- 84 F7.3 [solMass/Myr] logdM/dt ? logarithm of the mass loss rate
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Byte-by-byte Description of file: table3s.dat table4s.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- NIRS NIRS designation, [LTY2003] NIRS HHMMm+DDMM
12 A1 --- f_NIRS [a] a when two identifications proposed
(in table4s.dat only)
13- 23 A11 --- IRAS IRAS designation
25- 26 I2 h RAh Right ascension (J2000)
28- 29 I2 min RAm Right ascension (J2000)
31- 35 F5.2 s RAs Right ascension (J2000)
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 47 F4.1 arcsec DEs Declination (J2000)
49 A1 --- rPos [MTUS] Position source (1)
51- 59 A9 --- GSC GSC designation
61- 77 A17 --- MSX6C MSX6C designation
79- 82 F4.1 mag Vmag ? V magnitude, from various sources
84- 87 F4.1 mag Imag ? I magnitude, from various sources
90- 92 F3.1 mag Ksmag ? Ks magnitude, from 2MASS (II/246)
94- 98 F5.2 mag Kmag ? K magnitude, as in table3
100-104 F5.2 mag K-L' ? K-L' colour index, as in table3
107-147 A41 --- Remarks Other cross-identifications and remarks
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Note (1): Position source, with the following definitions:
M = 2MASS (Cat. II/246),
T = Tycho-2 (Cat. I/259),
U = UCAC2 (Cat. I/289);
S = Simbad, for IRAS sources of table4.dat.
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Acknowledgements:
Thibaut Le Bertre
History:
* 28-Mar-2003: Original version
* 12-Oct-2004: Positions added by B. Skiff.
(End) Patricia Bauer, Francois Ochsenbein [CDS] 12-Oct-2004