J/ApJS/193/23 Fundamental stellar parameters in 47 Tucanae (McDonald+, 2011)
Fundamental parameters, integrated red giant branch mass loss, and dust
production in the galactic globular cluster 47 Tucanae.
McDonald I., Boyer M.L., van Loon J.T., Zijlstra A.A., Hora J.L.,
Babler B., Block M., Gordon K., Meade M., Meixner M., Misselt K.,
Robitaille T., Sewilo M., Shiao B., Whitney B.
<Astrophys. J. Suppl. Ser., 193, 23 (2011)>
=2011ApJS..193...23M 2011ApJS..193...23M
ADC_Keywords: Effective temperatures ; Stars, giant ; Clusters, globular
Keywords: circumstellar matter - globular clusters: individual (NGC 104) -
infrared: stars - stars: AGB and post-AGB - stars: mass-loss -
stars: winds, outflows
Abstract:
Fundamental parameters and time evolution of mass loss are
investigated for post-main-sequence stars in the Galactic globular
cluster 47 Tucanae (NGC 104). This is accomplished by fitting spectral
energy distributions (SEDs) to existing optical and infrared
photometry and spectroscopy, to produce a true Hertzsprung-Russell
diagram. We confirm the cluster's distance as d=4611+213-200pc and
age as 12±1Gyr. Horizontal branch models appear to confirm that no
more red giant branch mass loss occurs in 47 Tuc than in the more
metal-poor ω Centauri, though difficulties arise due to
inconsistencies between the models. Using our SEDs, we identify those
stars that exhibit infrared excess, finding excess only among the
brightest giants: dusty mass loss begins at a luminosity of
∼1000L☉, becoming ubiquitous above L=2000L☉. Recent claims
of dust production around lower-luminosity giants cannot be
reproduced, despite using the same archival Spitzer imagery.
Description:
The photometric data used in the SEDs come from a variety of different
sources covering different fields of view. These data are summarized
in Figure 1 and Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 128 7 Input photometric data and their coverage of the
cluster
table3.dat 47 47727 Stellar parameters as determined by SED fitting
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See also:
J/ApJS/166/249 : Stellar dynamics and proper motions in 47Tuc (McLaughlin+,
2006)
J/A+A/435/657 : Equivalent widths of 5 giants in 47 Tuc (Alves-Brito+, 2005)
J/AJ/123/855 : Magellanic Clouds Photometric Survey: the SMC (Zaritsky+,
2002)
J/A+A/372/85 : Detected sources at 12µm in 47 Tuc (Ramdani+, 2001)
J/ApJ/559/1060 : Variables in 47 Tuc (Albrow+, 2001)
J/A+AS/106/161 : (V,I) photometry in NGC 6356 and 47 Tuc (Bica+ 1994)
J/PASP/99/739 : BV photometry in 4 fields of 47 Tuc (Hesser+, 1987)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- lambda Wavelength
14 A1 --- f_lambda [ac] Spitzer/IRAC or MIPS for 24um (1)
16- 66 A51 --- Aut Source author
67 A1 --- f_Aut [b] Flag on Aut (2)
69- 87 A19 --- BibCode Bibcode
89-128 A40 --- Note Coverage
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Note (1): Flag as follows:
a = Spitzer IRAC at 3.6, 4.5, 5.8, and 8um; Fazio et al. (2004ApJS..154...10F 2004ApJS..154...10F)
c = Spitzer MIPS; Rieke et al. (2004ApJS..154...25R 2004ApJS..154...25R)
Note (2): We use the re-analyzed data of Boyer et al. (2010ApJ...711L..99B 2010ApJ...711L..99B).
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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- 5 I5 --- Seq Star sequence number
7- 15 F9.7 deg RAdeg Right Ascension in decimal degrees (J2000)
17- 27 F11.7 deg DEdeg Declination in decimal degrees (J2000)
29- 33 I5 K Teff Effective temperature
35- 47 F13.7 Lsun Lum Luminosity
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History:
From electronic version of the journal
References:
McDonald et al. Paper I (ω Centauri=NGC 5139) 2009MNRAS.394..831M 2009MNRAS.394..831M
Boyer et al. Paper II (NGC 362) 2009ApJ...705..746B 2009ApJ...705..746B
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-May-2011