A<i>Spitzer</i>IRAC Census of the Asymptotic Giant Branch Populations in Local Group Dwarfs. II. IC 1613

Jackson, D. C.; Skillman, Evan D.; Gehrz, R. D.; Polomski, Elisha; Woodward, C. E.

doi:10.1086/520912

Cited by 24 publications

(15 citation statements)

References 31 publications

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“…When comparing their IR data to the optical data of Albert et al (2000), Jackson et al (2007b) found that Albert et al (2000) had detected only 50% of the AGB population. Furthermore, Jackson et al (2007b) estimated that as Albert et al (2000) applied a blue limit in (R − I) when selecting AGB candidates they actually used only 18% of the AGB population when calculating the global C/M ratio. The poor AGB detection rate reported for Albert et al (2000) was repeated when comparing the IRAC data to other optical data sets in IC 1613 and in other dwarf galaxies (Jackson et al 2007a;Boyer et al 2009).…”

Section: Albert Et Al (2000)mentioning

confidence: 99%

The AGB population in IC 1613 usingJHKphotometry

Sibbons

Ryan

Irwin

et al. 2014

A&A

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Context. A member of the Local Group, IC 1613 is a gas rich irregular dwarf galaxy that appears to have formed stars continuously over the last 10 Gyr and is relatively independent of external influences from other galaxies. Aims. This paper aims to study the spatial distribution of the asymptotic giant branch (AGB) population in IC 1613 and its metallicity. Methods. Using WFCAM on UKIRT, high quality JHK photometry of an area of 0.8 deg 2 centered on IC 1613 was obtained. The data have been used to isolate the C-and M-type components of the AGB population and using their number ratio, C/M, a global mean metallicity has been derived. The metallicity and the tip of the red giant branch magnitude (TRGB) have been studied as a function of distance from the galactic centre and as a function of azimuthal angle. Results. The TRGB has been found to be at K 0 = 18.25 ± 0.15 mag. The colour separation between the C-and M-type components of the AGB population has been located at (J − K) 0 = 1.15 ± 0.05 mag, giving a global C/M ratio of 0.52 ± 0.04 and from this an iron abundance of [Fe/H] = −1.26 ± 0.07 dex has been calculated. Conclusions. The AGB population has been detected out to a radial distance of 4.5 kpc in the de-projected plane of the galaxy. The measured TRGB is consistent with previous measurements and no significant variation is detected in the TRGB or in metallicity either with galactocentric distance or azimuthal angle.

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Section: Albert Et Al (2000)mentioning

confidence: 99%

The AGB population in IC 1613 usingJHKphotometry

Sibbons

Ryan

Irwin

et al. 2014

A&A

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“…The reason for this is still not clear, but is possibly due to the underestimation of the mass-loss rates at low metallicities. As a concurring factor, the circumstellar extinction presently assumed in the models may be somewhat underestimated, as suggested by the Spitzer observations of nearby dwarf irregulars by Jackson et al (2007aJackson et al ( , 2007b and Boyer et al (2009a). Regardless, it is likely that the problem is limited to low metallicities, since the MG07 TP-AGB models have been calibrated in the intermediate-metallicity Magellanic Clouds.…”

Section: Introductionmentioning

confidence: 99%

The Acs Nearby Galaxy Survey Treasury. Ix. Constraining Asymptotic Giant Branch Evolution With Old Metal-Poor Galaxies

Girardi

Williams

Gilbert

et al. 2010

ApJ

338

458

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In an attempt to constrain evolutionary models of the asymptotic giant branch (AGB) phase at the limit of low masses and low metallicities, we have examined the luminosity functions and number ratios between AGB and red giant branch (RGB) stars from a sample of resolved galaxies from the ACS Nearby Galaxy Survey Treasury. This database provides Hubble Space Telescope optical photometry together with maps of completeness, photometric errors, and star formation histories for dozens of galaxies within 4 Mpc. We select 12 galaxies characterized by predominantly metal-poor populations as indicated by a very steep and blue RGB, and which do not present any indication of recent star formation in their color-magnitude diagrams. Thousands of AGB stars brighter than the tip of the RGB (TRGB) are present in the sample (between 60 and 400 per galaxy), hence, the Poisson noise has little impact in our measurements of the AGB/RGB ratio. We model the photometric data with a few sets of thermally pulsing AGB (TP-AGB) evolutionary models with different prescriptions for the mass loss. This technique allows us to set stringent constraints on the TP-AGB models of low-mass, metalpoor stars (with M < 1.5 M , [Fe/H] −1.0). Indeed, those which satisfactorily reproduce the observed AGB/RGB ratios have TP-AGB lifetimes between 1.2 and 1.8 Myr, and finish their nuclear burning lives with masses between 0.51 and 0.55 M . This is also in good agreement with recent observations of white dwarf masses in the M4 old globular cluster. These constraints can be added to those already derived from Magellanic Cloud star clusters as important mileposts in the arduous process of calibrating AGB evolutionary models.

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“…Several dwarf galaxies in and around the Local Group are suitable, but their large distances make IR observations difficult. A few studies (Jackson et al 2007a(Jackson et al , 2007bBoyer et al 2009;Davidge 2014;Jones et al 2014) have statistically inferred the presence of dust-producing AGB stars in several star-forming dwarf galaxies, but were unable to identify individual dusty stars due both to confusion with unresolved background galaxies and to substantial circumstellar extinction at optical wavelengths. At these distances, additional information is necessary to confidently identify individual dusty AGB stars.…”

Section: Introductionmentioning

confidence: 99%

An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). IV. Discovery of High-redshift AGB Analogs^*

Boyer¹,

McQuinn

Groenewegen

et al. 2017

ApJ

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The survey for DUST in Nearby Galaxies with Spitzer (DUSTiNGS) identified several candidate Asymptotic Giant Branch (AGB) stars in nearby dwarf galaxies and showed that dust can form even in very metal-poor systems (~ Z Z 0.008 ). Here, we present a follow-up survey with WFC3/IR on the Hubble Space Telescope (HST), using filters that are capable of distinguishing carbon-rich (C-type) stars from oxygen-rich (M-type) stars: F127M, F139M, and F153M. We include six star-forming DUSTiNGS galaxies (NGC 147, IC 10, Pegasus dIrr, Sextans B, Sextans A, and Sag DIG), all more metal-poor than the Magellanic Clouds and spanning 1dex in metallicity. We double the number of dusty AGB stars known in these galaxies and find that most are carbon rich. We also find 26 dusty M-type stars, mostly in IC 10. Given the large dust excess and tight spatial distribution of these M-type stars, they are most likely on the upper end of the AGB mass range (stars undergoing Hot Bottom Burning). Theoretical models do not predict significant dust production in metal-poor M-type stars, but we see evidence for dust excess around M-type stars even in the most metal-poor galaxies in our sample ( + = ( ) -12 log O H 7.26 7.50). The low metallicities and inferred high stellar masses (up to ∼10  M ) suggest that AGB stars can produce dust very early in the evolution of galaxies (∼30 Myr after they form), and may contribute significantly to the dust reservoirs seen in high-redshift galaxies.

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ASpitzerIRAC Census of the Asymptotic Giant Branch Populations in Local Group Dwarfs. II. IC 1613

Cited by 24 publications

References 31 publications

The AGB population in IC 1613 usingJHKphotometry

The AGB population in IC 1613 usingJHKphotometry

The Acs Nearby Galaxy Survey Treasury. Ix. Constraining Asymptotic Giant Branch Evolution With Old Metal-Poor Galaxies

An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). IV. Discovery of High-redshift AGB Analogs^*

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ASpitzerIRAC Census of the Asymptotic Giant Branch Populations in Local Group Dwarfs. II. IC 1613

Cited by 24 publications

References 31 publications

The AGB population in IC 1613 usingJHKphotometry

The AGB population in IC 1613 usingJHKphotometry

The Acs Nearby Galaxy Survey Treasury. Ix. Constraining Asymptotic Giant Branch Evolution With Old Metal-Poor Galaxies

An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). IV. Discovery of High-redshift AGB Analogs*

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Product

Resources

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An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). IV. Discovery of High-redshift AGB Analogs^*