scholarly journals Working Group on Hot Massive Stars (Groupe De Travail Sur Les Etoiles Massives Chaudes)

2000 ◽  
Vol 24 (1) ◽  
pp. 176-185
Author(s):  
Philippe Eenens ◽  
Joseph Cassinelli ◽  
Peter Conti ◽  
Catharine Garmany ◽  
Karel van der Hucht ◽  
...  
Keyword(s):  
Executive Committee ◽  
Working Group ◽  
Collaborative Research ◽  
Massive Stars ◽  
Starburst Galaxies ◽  
General Assembly ◽  
Hot Stars ◽  
Ob Stars ◽  
Luminous Blue Variables

The Working Group on Hot Massive Stars has been officially recognized by the IAU Executive Committee during the XXIII General Assembly in August 1997. Its origins are the Hot Star Newsletter, launched in 1994, and a long tradition of interaction and collaborative research strengthened by a series of meetings on hot beaches. It gathers over 500 researchers working on OB stars, Luminous Blue Variables, Wolf-Rayet stars, and in general all topics related to the evolution of massive stars and to the physics and consequences of winds from hot stars. The very successful recent symposium on “Wolf-Rayet phenomena in massive stars and starburst galaxies” is an indicator of the increasing interest of the extragalactic community in the study of these extraordinary stars.

scholarly journals DIVISION IV / WORKING GROUP MASSIVE STARS

2008 ◽  
Vol 4 (T27A) ◽  
pp. 236-239
Author(s):  
Stanley P. Owocki ◽  
Paul A. Crowther ◽  
Alexander W. Fullerton ◽  
Gloria Koenigsberger ◽  
Norbert Langer ◽  
...  
Keyword(s):  
Working Group ◽  
Gamma Ray ◽  
Massive Stars ◽  
Gamma Ray Bursts ◽  
Core Collapse ◽  
Hot Stars ◽  
First Stars ◽  
Ob Stars ◽  
Red Supergiants

Our Working Group studies massive, luminous stars, with historical focus on early-type (OB) stars, but extending in recent years to include massive red supergiants that evolve from hot stars. There is also emphasis on the role of massive stars in other branches of astrophysics, particularly regarding starburst galaxies, the first stars, core-collapse gamma-ray bursts, and formation of massive stars.

scholarly journals Proceedings of the Joint Discussion: Parameters of the Earth's Gravitational Field

1966 ◽  
Vol 12 (2) ◽  
pp. 607-609
Author(s):  
A. H. Cook
Keyword(s):  
Gravitational Field ◽  
Executive Committee ◽  
Working Group ◽  
General Assembly ◽  
International Astronomical Union ◽  
Earth’S Gravitational Field ◽  
International Astronomical ◽  
Astronomical Constants

The Chairman, W. Fricke, President of Commission 4, opened the Joint Discussion by drawing attention to the purpose and proposed procedure for the meeting. The Joint Discussion had been arranged by the Executive Committee of the Union in order to avoid the necessity for separate discussions by each Commission that was affected by the Report of the Working Group on the IAU System of Astronomical Constants. The Organizing Committee therefore proposed the following resolution:‘The members of the IAU at this Joint Discussion recommend to the Executive Committee that the following resolution be put before the General Assembly: “The International Astronomical Union endorses the final list of constants prepared by the Working Group on the System of Astronomical Constants and recommends that it be used in the national and international astronomical ephemerides at the earliest practicable date.’”

scholarly journals Proceedings of the Joint Discussion: Arguments in Favor of the Revision of the Conventional System of Astronomical Constants

1966 ◽  
Vol 12 (2) ◽  
pp. 604-606
Author(s):  
W. Fricke
Keyword(s):  
Executive Committee ◽  
Working Group ◽  
General Assembly ◽  
Conventional System ◽  
International Astronomical Union ◽  
International Astronomical ◽  
Astronomical Constants

The Chairman, W. Fricke, President of Commission 4, opened the Joint Discussion by drawing attention to the purpose and proposed procedure for the meeting. The Joint Discussion had been arranged by the Executive Committee of the Union in order to avoid the necessity for separate discussions by each Commission that was affected by the Report of the Working Group on the IAU System of Astronomical Constants. The Organizing Committee therefore proposed the following resolution:‘The members of the IAU at this Joint Discussion recommend to the Executive Committee that the following resolution be put before the General Assembly: “The International Astronomical Union endorses the final list of constants prepared by the Working Group on the System of Astronomical Constants and recommends that it be used in the national and international astronomical ephemerides at the earliest practicable date.’”

scholarly journals Working Group on Future Large Scale Facilities in Astronomy

1997 ◽  
Vol 23 (1) ◽  
pp. 59-60
Author(s):  
H. R. Butcher
Keyword(s):  
Executive Committee ◽  
Working Group ◽  
Large Scale ◽  
General Assembly ◽  
The Hague

The idea for a Working Group (WG) on “Future Large Scale Facilities in Astronomy” grew from a discussion held on 20 August, 1994, during the IAU General Assembly in The Hague. The IAU Executive Committee approved its formation in August, 1995, and its composition in October, 1995. The WG will remain active at least until the XXIIIrd General Assembly in Kyoto in 1997. Members are: H. Butcher (Chairman), R. Ekers, B. Fort, N. Kardashev, M. Longair, F. Pacini, L. Rodriguez, G. Swarup, Y. Tanaka, H. Tananbaun, and L. Woltjer (ex officio). The WG carries out its work mostly by email and FAX.

scholarly journals Working Group for Planetary System Nomenclature (Group De Travail Pour La Nomenclature Du System Plametaire)

1991 ◽  
Vol 21 (1) ◽  
pp. 613-619
Author(s):  
K. Aksnes ◽  
A. Brahic ◽  
M. Fulchignoni ◽  
M. Ya. Marov ◽  
D. Morrison ◽  
...  
Keyword(s):  
Executive Committee ◽  
Working Group ◽  
Planetary System ◽  
Planetary Science ◽  
General Assembly

It is with great sadness that we have to report the death on 24 August 1990 of the WG’s President, Harold Masursky, at the age of 66. Dr. Masursky is known for his many contributions in planetary science and for his many years of dedicated work in planetary nomenclature. During the interim until the next IAU General Assembly the IAU Executive Committee has appointed K. Aksnes as Acting President of the WG.

scholarly journals Searching for emission line and OB stars in Cl 1806-20 using a NIR narrow-band technique

2010 ◽  
Vol 6 (S272) ◽  
pp. 606-607 ◽  
Author(s):  
Michelle L. Edwards ◽  
Reba M. Bandyopadhyay ◽  
Stephen S. Eikenberry ◽  
Valerie J. Mikles ◽  
Dae-Sik Moon
Keyword(s):  
Emission Line ◽  
Massive Star ◽  
Near Infrared ◽  
Narrow Band ◽  
Massive Stars ◽  
Narrow Band Imaging ◽  
Ob Stars ◽  
Luminous Blue Variables ◽  
Upper Limit

AbstractWe survey the environment of Cl 1806-20 using near-infrared narrow-band imaging to search for Brγ features indicative of evolved massive stars. Using this technique, we successfully detect previously identified massive stars in the cluster. We detect no new emission line stars, establishing a firm upper limit on the number of Wolf Rayets and Luminous Blue Variables; however, we do find several candidate OB supergiants, which likely represent the bulk of the heretofore undiscovered massive star population.

scholarly journals Red noise and pulsations in evolved massive stars

2021 ◽  
Author(s):  
Yaël Nazé ◽  
Gregor Rauw ◽  
Eric Gosset
Keyword(s):  
High Frequency ◽  
Massive Stars ◽  
Ob Stars ◽  
Luminous Blue Variables ◽  
Clean Sample ◽  
High Cadence

Abstract We examine high-cadence space photometry taken by the Transiting Exoplanet Survey Satellite (TESS) of a sample of evolved massive stars (26 Wolf-Rayet stars and 8 Luminous Blue Variables or candidate LBVs). To avoid confusion problems, only stars without bright Gaia neighbours and without evidence of bound companions are considered. This leads to a clean sample, whose variability properties should truly reflect the properties of the WR and LBV classes. Red noise is detected in all cases and its fitting reveals characteristics very similar to those found for OB-stars. Coherent variability is also detected for 20% of the WR sample. Most detections occur at moderately high frequency (3–14 d−1), hence are most probably linked to pulsational activity. This work doubles the number of WRs known to exhibit high-frequency signals.

scholarly journals Proceedings of the Joint Discussion: Masses of the Principal Planets

1966 ◽  
Vol 12 (2) ◽  
pp. 609-614
Author(s):  
G. M. Clemence
Keyword(s):  
Executive Committee ◽  
Working Group ◽  
General Assembly ◽  
International Astronomical Union ◽  
International Astronomical ◽  
Astronomical Constants

The Chairman, W. Fricke, President of Commission 4, opened the Joint Discussion by drawing attention to the purpose and proposed procedure for the meeting. The Joint Discussion had been arranged by the Executive Committee of the Union in order to avoid the necessity for separate discussions by each Commission that was affected by the Report of the Working Group on the IAU System of Astronomical Constants. The Organizing Committee therefore proposed the following resolution:‘The members of the IAU at this Joint Discussion recommend to the Executive Committee that the following resolution be put before the General Assembly: “The International Astronomical Union endorses the final list of constants prepared by the Working Group on the System of Astronomical Constants and recommends that it be used in the national and international astronomical ephemerides at the earliest practicable date.’”

scholarly journals EXECUTIVE COMMITTEE WORKING GROUP WOMEN IN ASTRONOMY

2007 ◽  
Vol 3 (T26B) ◽  
pp. 249-250
Author(s):  
Anne J. Green ◽  
Sarah T. Maddison ◽  
Johannes Andersen ◽  
Olga B. Dluzhnevskaya ◽  
Gloria M. Dubner ◽  
...  
Keyword(s):  
Executive Committee ◽  
Working Group ◽  
General Assembly ◽  
Vice Presidents ◽  
General Secretary ◽  
Incoming President

The second Women in Astronomy Lunchtime Meeting was held on Monday 21 August 2006, with more than 250 participants. The meeting was hosted by the EC Working Group for Women in Astronomy, established at the 2003 IAU General Assembly, and was attended by the current President, the Presidents-Elect for this and the next General Assembly, the General Secretary and Vice-Presidents, many senior astronomers, as well as students and young astronomers. It was a particular pleasure to welcome and congratulate the incoming President, Dr Catherine Cesarsky, the first woman to hold the position.

scholarly journals Observations of magnetic fields in hot stars

2010 ◽  
Vol 6 (S272) ◽  
pp. 106-117 ◽  
Author(s):  
Véronique Petit
Keyword(s):  
Magnetic Properties ◽  
Magnetic Fields ◽  
Massive Stars ◽  
Current Understanding ◽  
High Mass ◽  
Hot Stars ◽  
Precise Information ◽  
Ob Stars ◽  
Modern Methods ◽  
New Generation

AbstractThe presence of magnetic fields at the surfaces of many massive stars has been suspected for decades, to explain the observed properties and activity of OB stars. However, very few genuine high-mass stars had been identified as magnetic before the advent of a new generation of powerful spectropolarimeters that has resulted in a rapid burst of precise information about the magnetic properties of massive stars. During this talk, I will briefly review modern methods used to diagnose magnetic fields of higher-mass stars, and summarize our current understanding of the magnetic properties of OB stars.

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