J/ApJ/697/1993 Spitzer study of AGB stars. III. (Boyer+, 2009)
A Spitzer study of asymptotic giant branch stars.
III. Dust production and gas return in Local Group dwarf irregular galaxies.
Boyer M.L., Skillman E.D., van Loon J.T., Gehrz R.D., Woodward C.E.
<Astrophys. J., 697, 1993-2014 (2009)>
=2009ApJ...697.1993B 2009ApJ...697.1993B
ADC_Keywords: Galaxies, nearby ; Stars, giant ; Photometry, infrared
Keywords: galaxies: dwarf - galaxies: irregular - stars: AGB and post-AGB -
stars: carbon - stars: mass loss
Abstract:
We present the third and final part of a census of asymptotic giant
branch (AGB) stars in Local Group dwarf irregular (dIrr) galaxies.
Papers I (Jackson et al. 2007ApJ...656..818J 2007ApJ...656..818J) and II (Jackson et al.
2007ApJ...667..891J 2007ApJ...667..891J) presented the results for WLM and IC 1613.
Included here are Phoenix, LGS 3, DDO 210, Leo A, Pegasus dIrr, and
Sextans A. Spitzer photometry at 3.6, 4.5, 5.8, and 8um are presented,
along with a more thorough treatment of background galaxy
contamination than was presented in Papers I and II. We find that at
least a small population of completely optically obscured AGB stars
exists in each galaxy, regardless of the galaxy's metallicity, but
that higher metallicity galaxies tend to harbor more stars with slight
infrared excesses.
Description:
Table 2 summaries the observations obtained with IRAC from 2003-12-06
to 2007-08-16, for Phoenix, LGS 3, DDO 210, Leo A, Pegasus dIrr, and
Sextans A.
For WLM (Paper I) and IC 1613 (Paper II), Spitzer/IRAC data were
obtained in two separate AORs on 2003 December UT and 2005 December 23
UT (AORKEYs: r5051136 and r15892480, respectively). Both AORs of WLM
were done as part of a larger guaranteed time observing program (PID:
128, PI: R. D. Gehrz).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 74 16 Observation details
table3.dat 72 21922 Sample table: IRAC point-source magnitudes
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See also:
J/A+A/493/1075 : JKs photometry of C stars in 2 nearby galaxies (Battinelli+
2009)
J/MNRAS/385/1045 : JHKsIc photometry of AGB in Phoenix dwarf gal. (Menzies+,
2008)
J/A+A/466/501 : JKs photometry of WLM galaxy carbon stars (Valcheva+, 2007)
J/AJ/127/2723 : Abundances of 3 supergiants in Sextans A (Kaufer+, 2004)
J/AJ/119/2780 : C stars in IC 1613 (Albert+, 2000)
J/AJ/120/1801 : C stars in Pegasus, DDO 210 and Tucana (Battinelli+, 2000)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Gal Galaxy identification
13- 20 I8 --- AOR AOR Key
22- 23 I2 h RAh Hour of right ascension (J2000)
25- 26 I2 min RAm Minute of right ascension (J2000)
28- 32 F5.2 s RAs Second of right ascension (J2000)
34 A1 --- DE- Sign of declination (J2000)
35- 36 I2 deg DEd Degree of declination (J2000)
38- 39 I2 arcmin DEm Arcminute of declination (J2000)
41- 44 F4.1 arcsec DEs Arcsecond of declination (J2000)
46- 50 I5 --- PID Program identification
52- 61 A10 "YYYY/MM/DD" Date Date of observation (UT)
63- 65 F3.1 um lam1 ? Wavelength minimum range
67- 69 F3.1 um lam2 ? Wavelength maximum range
71- 73 I3 s Depth ? Exposure depth
74 I1 --- Ref [1/2]? Observation reference (1)
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Note (1): Data for WLM and IC 1613 added by CDS with references as follows:
1 = Data from Paper I: Jackson et al., 2007ApJ...656..818J 2007ApJ...656..818J
2 = Data from Paper II: Jackson et al., 2007ApJ...667..891J 2007ApJ...667..891J
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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- 11 A11 --- Gal Galaxy identification
13- 16 A4 --- --- [SSTU]
18- 36 A19 --- SSTU Source identification (JHHMMSS.ss+DDMMSS.s) (1)
38- 41 F4.1 mag 3.6mag ? Spitzer/IRAC apparent 3.6 micron band magnitude
43- 45 F3.1 mag e_3.6mag ? Uncertainty in 3.6mag
47- 50 F4.1 mag 4.5mag ? Spitzer/IRAC apparent 4.5 micron band magnitude
52- 54 F3.1 mag e_4.5mag ? Uncertainty in 4.5mag
56- 59 F4.1 mag 5.8mag ? Spitzer/IRAC apparent 5.8 micron band magnitude
61- 63 F3.1 mag e_5.8mag ? Uncertainty in 5.8
65- 68 F4.1 mag 8.0mag ? Spitzer/IRAC apparent 8.0 micron band magnitude
70- 72 F3.1 mag e_8.0mag ? Uncertainty in 8.0mag
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Note (1): The source ID follows the standard Spitzer naming convention,
giving the truncated (J2000) coordinates.
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History:
From electronic version of the journal
References:
Jackson et al. Paper I. 2007ApJ...656..818J 2007ApJ...656..818J
Jackson et al. Paper II. 2007ApJ...667..891J 2007ApJ...667..891J
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 31-May-2011