A Speckle Duplicity Survey of the Hyades Cluster

Due to its proximity to the Sun, the Hyades serves the critical role of luminosity calibration of all cluster main sequences, and hence is one of the lower rungs in the cosmic distance ladder. We attempt here to use the enhanced capabilities of speckle interferometry, in comparison with classical techniques, to add to the list of binary and multiple stars in the Hyades. New systems will not only eventually help to improve our knowledge of the cluster distance, but they will also help further our understanding of the formation and evolution of binary and multiple stars in the cluster environment.

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Infrared and Millimeter Views of the Helix: the Nearest, Massive, Neutral Remnant of a Circumstellar Envelope

Symposium - International Astronomical Union ◽

10.1017/s0074180900203367 ◽

1999 ◽

Vol 191 ◽

pp. 425-430 ◽

Cited By ~ 1

Author(s):

P.J. Huggins ◽

P. Cox ◽

T. Forveille ◽

R. Bachiller ◽

K. Young

Keyword(s):

Large Scale ◽

Near Infrared ◽

Critical Role ◽

Ring Structure ◽

Circumstellar Envelope ◽

3 Dimensional ◽

Optical Images ◽

Formation And Evolution ◽

Visualization Techniques

We present new, infrared and millimeter views of the Helix nebula which illustrate the critical role of remnant, neutral AGB envelopes in the formation and evolution of planetary nebulae. Large scale ∼ 1 000″ mapping of the entire nebula in the CO (J = 2 − 1) line with the CSO reveals the global structure of the envelope. The CO emission forms the familiar ring structure seen in optical images of the Helix, and indicates a massive remnant with ≳ 50% the mass of the ionized nebula. High resolution CO mapping with the IRAM 30 m telescope shows that the whole envelope is fragmented into an intricate array of small clumps, closely related to the cometary globules seen in the central, ionized cavity. 5–17 μm spectroscopy of the Helix with ISOCAM reveals a remarkable near infrared spectrum, dominated by the pure (v = 0 − 0) rotational lines of H2. The H2 lines are excited to a temperature of ∼ 900 K, and likely arise in warm, outer layers of the small clumps seen in CO. Imaging of the H2 emission with ISOCAM over the whole nebula provides a striking portrait of the fragmented neutral envelope. 3-dimensional views of the envelope are also presented, based on CO mapping and using 3-dimensional visualization techniques. Point symmetries dominate the toroidal structure, and suggest an origin for the Helix in equatorial mass-loss on the AGB, shaped by the action of bipolar outflows or jets.

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Double Stars: The Closest and the Most Distant Systems

International Astronomical Union Colloquium ◽

10.1017/s0252921100100466 ◽

1982 ◽

Vol 69 ◽

pp. 145-151

Author(s):

Tibor J. Herczeg

Keyword(s):

Local Group ◽

The Sun ◽

Double Stars ◽

Multiple Stars ◽

Binary And Multiple Stars

Review and comments on two extremely different samples of binary and multiple stars: systems within 10 parsecs of the sun and systems discovered in galaxies of the Local Group.

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Roadmap on the theoretical work of BinaMIcS

Proceedings of the International Astronomical Union ◽

10.1017/s1743921314002373 ◽

2013 ◽

Vol 9 (S302) ◽

pp. 311-312 ◽

Cited By ~ 2

Author(s):

Stéphane Mathis ◽

Coralie Neiner ◽

Evelyne Alecian ◽

Gregg Wade ◽

Keyword(s):

Magnetic Fields ◽

Theoretical Work ◽

Magnetic Interactions ◽

Complex Interactions ◽

Multiple Stars ◽

Stellar Formation ◽

Tidal Flows ◽

Binary And Multiple Stars ◽

Stellar Magnetic Fields

AbstractWe review the different theoretical challenges concerning magnetism in interacting binary or multiple stars that will be studied in the BinaMIcS (Binarity and Magnetic Interactions in various classes of Stars) project during the corresponding spectropolarimetric Large Programs at CFHT and TBL. We describe how completely new and innovative topics will be studied with BinaMIcS such as the complex interactions between tidal flows and stellar magnetic fields, the MHD star-star interactions, and the role of stellar magnetism in stellar formation and vice versa. This will strongly modify our vision of the evolution of interacting binary and multiple stars.

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The Role of the SLP in Autism Spectrum Disorder Screening and Assessment

Perspectives on Language Learning and Education ◽

10.1044/lle15.2.50 ◽

2008 ◽

Vol 15 (2) ◽

pp. 50-59 ◽

Cited By ~ 1

Author(s):

Amy Philofsky

Keyword(s):

Language Development ◽

Critical Role ◽

Children With Autism ◽

Autism Spectrum ◽

Children With Asd ◽

Prevalence Estimates ◽

Notable Increase ◽

Screening Assessment ◽

Critical Components

AbstractRecent prevalence estimates for autism have been alarming as a function of the notable increase. Speech-language pathologists play a critical role in screening, assessment and intervention for children with autism. This article reviews signs that may be indicative of autism at different stages of language development, and discusses the importance of several psychometric properties—sensitivity and specificity—in utilizing screening measures for children with autism. Critical components of assessment for children with autism are reviewed. This article concludes with examples of intervention targets for children with ASD at various levels of language development.

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