The Alexandria Digital Library Tesbed

Frew, James; Freeston, Michael; Kemp, Randall B.; Simpson, Jason R.; Smith, Terence R.; Wells, Alex; Zheng, Qi

doi:10.1045/july96-frew

Cited by 24 publications

(18 citation statements)

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“…We therefore adopt an alternative distance-dependent approach that estimates the luminosity of the central star following Sect. 9.4.5 of Frew (2008). We adopt a weighted mean distance of 3092 ± 507 pc, which incorporates distance estimates of 3342 ± 668 pc (Stanghellini & Haywood 2010) and 2750 ± 780 pc (Frew et al 2016), along with an apparent magnitude m V = 14.9 mag (Sahai et al 1999), T eff = 50 ± 10 kK and a reddening of A V = 2.63 mag (Tsamis et al 2003).…”

Section: Periodic Variability and Orbital Parametersmentioning

confidence: 99%

“…9.4.5 of Frew (2008). We adopt a weighted mean distance of 3092 ± 507 pc, which incorporates distance estimates of 3342 ± 668 pc (Stanghellini & Haywood 2010) and 2750 ± 780 pc (Frew et al 2016), along with an apparent magnitude m V = 14.9 mag (Sahai et al 1999), T eff = 50 ± 10 kK and a reddening of A V = 2.63 mag (Tsamis et al 2003). We determine using Considering the uncertainties in this distance-dependent method, we adopt M 1 = 0.6 ± 0.1 M after making comparisons with post-AGB evolutionary tracks (Miller Bertolami et al 2016).…”

Section: Periodic Variability and Orbital Parametersmentioning

confidence: 99%

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SALT HRS Discovery of the Binary Nucleus of the Etched Hourglass Nebula MyCn 18

Miszalski¹,

Manick

Mikołajewska³

et al. 2018

Publ. Astron. Soc. Aust.

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The shaping of various morphological features of planetary nebulae (PNe) is increasingly linked to the role of binary central stars. Identifying a binary within a PN offers a powerful tool with which to directly investigate the formation mechanisms behind these features. The Etched Hourglass Nebula, MyCn 18, is the archetype for several binary-linked morphological features, yet it has no identified binary nucleus. It has the fastest jets seen in a PN of 630 km s −1 , a central star position offset from the nebula centre, and a bipolar nebula with a very narrow waist. Here we report on the Southern African Large Telescope (SALT) High Resolution Spectrograph (HRS) detection of radial velocity variability in the nucleus of MyCn 18 with an orbital period of 18.15 ± 0.04 days and a semi-amplitude of 11.0 ± 0.3 km s −1 . Adopting an orbital inclination of 38 ± 5 deg and a primary mass of 0.6 ± 0.1 M yields a secondary mass of 0.19 ± 0.05 M corresponding to an M5V companion. The detached nature of the binary rules out a classical nova (CN) as the origin of the jets or the offset central star as hypothesised in the literature. Furthermore, scenarios that produce the offset central star during the AGB and that form narrow waist bipolar nebulae result in orbital separations 80-800 times larger than observed in MyCn 18. The inner hourglass and jets may have formed from part of the common envelope ejecta that remained bound to the binary system in a circumbinary disk, whereas the offset central star position may best be explained by proper motion. Detailed simulations of MyCn 18 are encouraged that are compatible with the binary nucleus to further investigate its complex formation history.

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Section: Periodic Variability and Orbital Parametersmentioning

confidence: 99%

Section: Periodic Variability and Orbital Parametersmentioning

confidence: 99%

SALT HRS Discovery of the Binary Nucleus of the Etched Hourglass Nebula MyCn 18

Miszalski¹,

Manick

Mikołajewska³

et al. 2018

Publ. Astron. Soc. Aust.

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“…In pursuit of this objective the project developed three successive versions of the Alexandria Digital Library (ADL) architecture: a "rapid prototype" [7] system comprising a relational database of map and imagery metadata, accessed through a desktop geographic information system (GIS); a "web prototype" [10] system which replaced the stand-alone GIS with an HTTP server, generating an HTML forms-based user interface accessible via the World Wide Web; and the "ADL-3" [8] system which extended the HTTP server into full-fledged middleware, supporting HTTP interfaces to multiple clients, and connections to multiple catalog databases.…”

Section: Introductionmentioning

confidence: 99%

The ADEPT digital library architecture

Janée

Frew

2002

Proceedings of the 2nd ACM/IEEE-CS Joint Conference on Digital Libraries

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The Alexandria Digital Earth ProtoType (ADEPT) architecture is a framework for building distributed digital libraries of georeferenced information. An ADEPT system comprises one or more autonomous libraries, each of which provides a uniform interface to one or more collections, each of which manages metadata for one or more items. The primary standard on which the architecture is based is the ADEPT bucket framework, which defines uniform client-level metadata query services that are compatible with heterogeneous underlying collections. ADEPT functionality strikes a balance between the simplicity of Web document delivery and the richness of Z39.50. The current ADEPT implementation runs as servlet-based middleware and supports collections housed in arbitrary relational databases.

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“…During the last ten years Digital Libraries (DLs) have become an important and diffused information technology, with particular attention to book DLs and scientific document collections (see e.g, [16,2,8,17,14,7,15,13,18]). …”

Section: Introductionmentioning

confidence: 99%

The multilingual thesaurus of LAURIN

Calvanese

Catarci

Lenzerini

et al. 2002

Proceedings of the 14th International Conference on Software Engineering and Knowledge Engineering

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Among the wide range of digital libraries, an interesting, yet quite neglected, subclass is constituted by those exclusively dealing with newspaper clippings. Compared with book-oriented digital libraries, clipping libraries are more difficult to seize, since they are wide and unstructured, and the subjects and content of a clipping are completely heterogeneous. LAURIN is an EU-funded project involving seventeen participants from several countries, including two software companies and a large group of libraries, whose main purpose is to set up a network of digitalized newspaper clipping archives that can be easily accessed through the Internet, for searching and retrieving clippings. The project also provides the libraries with models and methodologies to be used for scanning, digitalizing, storing, indexing, and making accessible newspaper clippings. The core of the LAURIN system is an integrated multilingual Thesaurus. In this paper we illustrate how to express the thesaurus in terms of a knowledge base, and how to exploit such a knowledge base to improve the fundamental task of clipping retrieval. Copyright 2002 ACM

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The Alexandria Digital Library Tesbed

Cited by 24 publications

References 0 publications

SALT HRS Discovery of the Binary Nucleus of the Etched Hourglass Nebula MyCn 18

SALT HRS Discovery of the Binary Nucleus of the Etched Hourglass Nebula MyCn 18

The ADEPT digital library architecture

The multilingual thesaurus of LAURIN

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