Infrared dust emission from globular clusters

Angeletti, L.; Blanco, A.; Bussoletti, E.; Capuzzo-Dolcetta, Roberto; Giannone, P.

doi:10.1093/mnras/199.2.441

Cited by 11 publications

(9 citation statements)

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“…Detailed calculation by Hopwood (2000) suggests that T d 50 K for silicate dust in NGC 7078 (see also Angeletti et al 1982). The ISOPHOT colour corrections (Laureijs et al 2002) for this temperature are listed in Table 2, together with the corresponding colour-corrected flux densities; we use these values in what follows.…”

Section: Resultsmentioning

confidence: 99%

Far infra-red emission from NGC 7078: First detection of intra-cluster dust in a globular cluster

Evans

Stickel

Loon

et al. 2003

A&A

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Abstract. Improved data analysis of far infrared imaging data of the globular cluster NGC 7078 obtained with the ISO instrument ISOPHOT at 60 µm, 70 µm and 90 µm has detected the thermal emission from dust in its core, the first secure detection of intra-cluster dust in a globular cluster. The amount of dust is broadly consistent with mass-loss from evolved, metal-deficient stars in NGC 7078 in the time since it last crossed the Galactic plane.

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Section: Resultsmentioning

confidence: 99%

Far infra-red emission from NGC 7078: First detection of intra-cluster dust in a globular cluster

Evans

Stickel

Loon

et al. 2003

A&A

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“…The expected mass loss is about 0.2 M along the RGB and about 0.1 M along the AGB (e.g., Fusi Pecci & Renzini 1976). As a consequence of such mass-loss processes, dust and gas should be present in the intracluster medium as diffuse clouds (see, e.g., Angeletti et al 1982) or concentrated in circumstellar envelopes. If no cleaning mechanism is at work between two Galactic plane crossings, a few tens of solar masses of intracluster matter should be accumulated in the central regions of the most massive clusters (i.e., those with large central escape velocity).…”

Section: Introductionmentioning

confidence: 99%

ISOCAM Observations of Galactic Globular Clusters: Mass Loss along the Red Giant Branch

Origlia

Ferraro

Pecci

et al. 2002

ApJ

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Deep images in the 10 lm spectral region have been obtained for five massive Galactic globular clusters, NGC 104 (=47 Tuc), NGC 362, NGC 5139 (=! Cen), NGC 6388, NGC 7078 (=M15), and NGC 6715 (=M54) in the Sagittarius Dwarf Spheroidal using the ISOCAM on board the Infrared Space Observatory in 1997. A significant sample of bright giants have an ISOCAM counterpart, but only fewer than 20% of these have a strong mid-IR excess indicative of dusty circumstellar envelopes. From a combined physical and statistical analysis we derive mass-loss rates and frequency. We find that (1) significant mass loss occurs only at the very end of the Red Giant Branch evolutionary stage and is episodic, (2) the modulation timescales must be greater than a few decades and less than a million years, and (3) mass-loss occurrence does not show a crucial dependence on the cluster metallicity.

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“…The frequencies become imaginary when ρ is sufficiently low, and Chan-drasekhar interprets this as the onset of instability. A somewhat similar approach was taken by Angeletti, Capuzzo-Dolcetta, & Giannone (1983), who studied orbits in the nearly constantdensity core of a cluster. They used Floquet analysis to determine the stability limit and were thus able to extend results to the case of a cluster on a non-circular galactic orbit.…”

Section: Tidal Stabilitymentioning

confidence: 99%

Problems of collisional stellar dynamics

Heggie

2011

Fluid Flows to Black Holes

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Abstract.The discovery of dynamical friction was Chandrasekhar's best known contribution to the theory of stellar dynamics, but his work ranged from the few-body problem to the limit of large N (in effect, galaxies). Much of this work was summarised in the text "Principles of Stellar Dynamics" (Chandrasekhar, 1942(Chandrasekhar, , 1960, which ranges from a precise calculation of the time of relaxation, through a long analysis of galaxy models, to the behaviour of star clusters in tidal fields. The later edition also includes the work on dynamical friction and related issues. In this review we focus on progress in the collisional aspects of these problems, i.e. those where fewbody interactions play a dominant role, and so we omit further discussion of galaxy dynamics.2 But we try to link Chandrasekhar's fundamental discoveries in collisional problems with the progress that has been made in the 50 years since the publication of the enlarged edition.

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Infrared dust emission from globular clusters

Cited by 11 publications

References 0 publications

Far infra-red emission from NGC 7078: First detection of intra-cluster dust in a globular cluster

Far infra-red emission from NGC 7078: First detection of intra-cluster dust in a globular cluster

ISOCAM Observations of Galactic Globular Clusters: Mass Loss along the Red Giant Branch

Problems of collisional stellar dynamics

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