J/MNRAS/394/795 AGB stars in Fornax dwarf spheroidal galaxy (Whitelock+, 2009)
Asymptotic giant branch stars in the Fornax dwarf spheroidal galaxy.
Whitelock P.A., Menzies J.W., Feast M.W., Matsunaga N., Tanabe T., Ita Y.
<Mon. Not. R. Astron. Soc., 394, 795-809 (2009)>
=2009MNRAS.394..795W 2009MNRAS.394..795W
ADC_Keywords: Galaxies, nearby ; Stars, giant ; Photometry, infrared
Keywords: stars: AGB and post-AGB - stars: carbon - stars: late-type -
stars: variables: other - galaxies: individual: Fornax - Local Group
Abstract:
We report on a multi-epoch study of the Fornax dwarf spheroidal
galaxy, made with the Infrared Survey Facility, over an area of
about 42x42arcmin2. The colour-magnitude diagram shows a broad
well-populated giant branch with a tip that slopes downwards from red
to blue, as might be expected given Fornax's known range of age and
metallicity. The extensive asymptotic giant branch (AGB) includes
seven Mira variables and 10 periodic semiregular variables. Five of
the seven Miras are known to be carbon rich. Their pulsation periods
range from 215 to 470d, indicating a range of initial masses. Three of
the Fornax Miras are redder than typical Large Magellanic Cloud (LMC)
Miras of similar period, probably indicating particularly heavy
mass-loss rates. Many, but not all, of the characteristics of the AGB
are reproduced by isochrones from Marigo et al. (2008A&A...482..883M 2008A&A...482..883M)
for a 2Gyr population with a metallicity of Z=0.0025.
Description:
Observations were made with the SIRIUS camera on the Japanese-SAAO
Infrared Survey Facility (IRSF) at Sutherland.
Observations were made at about 15 epochs spread over 3yr in the
central 4x4 grid
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 92 120 Non-variable (σ(J)σ(H)σ(Ks)<0.11)
upper AGB candidates
table2.dat 120 17 Periodic red variables
table3.dat 108 38 Variables without periods
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/PASP/110/533 : BR photometry of Fornax bright stars (Stetson+ 1998)
J/AJ/123/840 : VI photometry of variable stars in Fornax (Bersier+, 2002)
J/A+A/459/423 : VI and [Fe/H] of Fornax dSph RGB stars (Battaglia+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 I1 h RAh Right ascension (J2000)
3- 4 I2 min RAm Right ascension (J2000)
6- 9 F4.1 s RAs Right ascension (J2000)
11 A1 --- DE- Declination sign (J2000)
12- 13 I2 deg DEd Declination (J2000)
15- 16 I2 arcmin DEm Declination (J2000)
18- 21 F4.1 arcsec DEs Declination (J2000)
23- 27 I5 --- [WMF2009] Running number unique to the star within
our system, [WMF2009] F NNNNN in Simbad
29- 33 F5.2 mag Jmag J magnitude
35- 39 F5.2 mag Hmag H magnitude
41- 45 F5.2 mag Ksmag Ks magnitude
47- 50 F4.2 mag J-Ks J-Ks colour index
52- 67 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs)
69- 73 A5 --- SpType Spectral type
75- 92 A18 --- ONames Other names (G1)
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Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- VType Variable type (table2 only)
13- 17 I5 --- [WMF2009] Running number unique to the star within
our system, [WMF2009] F NNNNN in Simbad
19- 21 I3 d Per ? Period (table2 only)
23- 27 F5.2 mag Jmag J magnitude
29- 32 F4.2 mag Jamp ? Amplitude in J band
34- 38 F5.2 mag Hmag H magnitude
40- 43 F4.2 mag Hamp ? Amplitude in H band
45- 49 F5.2 mag Ksmag Ks magnitude
51- 54 F4.2 mag Kamp ? Amplitude in Ks band
56- 60 F5.2 mag mbol ? Bolometric magnitude (table2 only)
62- 66 F5.2 mag Mbol ? Absolute bolometric magnitude (table2 only)
68- 71 F4.2 mag J-Ks ? J-Ks colour index (table3 only)
73 A1 --- S [CM- ] Spectral type (Carbon or M-type)
75- 90 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs)
92-120 A29 --- ONames Other names (G1)
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Global notes:
Note (G1): Other names are from:
S = Stetson, Hesser & Smecker-Hane (1998, Cat. J/PASP/110/533),
SNN, [SHS98] NNN in Simbad
DK = Demers & Kunkel (1979PASP...91..761D 1979PASP...91..761D),
DKNN, DK NN in Simbad
DI = Demers & Irwin (1987MNRAS.226..943D 1987MNRAS.226..943D),
DINN, [DI87] VNN in Simbad
BW = Bersier & Wood (2002, Cat. J/AJ/123/840),
BWNN (where NN is the "recno" of Vizir),
FBW JHHMMSS.s+DDMMSS in Simbad
WEL = Westerlund et al. (1987A&A...178...41W 1987A&A...178...41W),
WEL-ANN, WEL ANN in Simbad
DDB = Demers et al. (2002AJ....123.3428D 2002AJ....123.3428D),
DDBNN, [DDB2002] NN in Simbad
GLM = Groenewegen et al. (2009A&A...504.1031G 2009A&A...504.1031G),
GLMNN, internal designation, not in Simbad
ET = Battaglia et al. (2006, Cat. J/A+A/459/423),
ETNNN, [BTH2006] ETNNN in Simbad
M = Mauron et al. (2004A&A...418...77M 2004A&A...418...77M)
MNN, [MAG2004] NN in Simbad
(NN-NNN) = Mastuura et al., 2007MNRAS.382.1889M 2007MNRAS.382.1889M,
NN-NNN, [BTH2006] fnx-NN NNN in Simbad
for = Battaglia et al. (2006, Cat. J/A+A/459/423),
forNN_NNN, [BTH2006] fnx-NN NNN in Simbad
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History:
* 03-Dec-2009: From electronic version of the journal
* 05-May-2010: one correction in table2
(End) Patricia Vannier [CDS] 27-Oct-2009