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Physical parameters and wind properties of galactic early B supergiants
- P. Crowther, D. Lennon, N. Walborn
- Physics
- 15 September 2005
We present optical studies of the physical and wind properties, plus CNO chemical abundances, of 25 O9.5–B3 Galactic supergiants. We employ non-LTE, line blanketed, extended model atmospheres, which…
O stars with weak winds: the Galactic case
- F. Martins, D. Schaerer, J. Hillier, F. Meynadier, M. Heydari-Malayeri, N. Walborn
- Physics
- 12 July 2005
We study the stellar and wind properties of a sample of Galactic O dwarfs to track the conditions under which weak winds (i.e mass loss rates lower than � 10 −8 M⊙ yr −1 ) appear. The sample is…
CONTEMPORARY OPTICAL SPECTRAL CLASSIFICATION OF THE OB STARS: A DIGITAL ATLAS
- N. Walborn, E. Fitzpatrick
- Physics
- 1 April 1990
Some recent developments in the optical classification of OB spectra are reviewed in terms of a comprehensive atlas of new blue-violet digital data from the CTIO 1-meter photon-counting system. These…
Spectral classification of OB stars in both hemispheres and the absolute-magnitude calibration.
- N. Walborn
- Physics
- 1972
THE GALACTIC O-STAR SPECTROSCOPIC SURVEY. I. CLASSIFICATION SYSTEM AND BRIGHT NORTHERN STARS IN THE BLUE-VIOLET AT R ∼ 2500
- A. Sota, J. Maíz Apellániz, J. Arias
- Physics, Geology
- 20 January 2011
We present the first installment of a massive spectroscopic survey of Galactic O stars, based on new, high signal-to-noise ratio, R ∼ 2500 digital observations from both hemispheres selected from the…
A New Spectral Classification System for the Earliest O Stars: Definition of Type O2
- N. Walborn, I. Howarth, J. Parker
- Physics
- 1 May 2002
High-quality, blue-violet spectroscopic data are collected for 24 stars that have been classified as type O3 and that display the hallmark N IV and N V lines. A new member of the class is presented;…
The space distribution of the O stars in the solar neighborhood.
- N. Walborn
- Physics
- 1 December 1973
New results pertaining to the two-dimensional spectral classification system for the O stars are presented. Classifications for additional stars in both hemispheres are given, and two groups of…
The VLT-FLAMES Tarantula Survey. VIII. Multiplicity properties of the O-type star population
- H. Sana, A. D. Koter, J. Vink
- Physics
- 20 September 2012
Context. The Tarantula Nebula in the Large Magellanic Cloud is our closest view of a starburst region and is the ideal environment to investigate important questions regarding the formation,…
THE GALACTIC O-STAR SPECTROSCOPIC SURVEY (GOSSS). II. BRIGHT SOUTHERN STARS
- A. Sota, J. M. Apell'aniz, E. Alfaro
- Physics
- 21 December 2013
We present the second installment of GOSSS, a massive spectroscopic survey of Galactic O stars, based on new homogeneous, high signal-to-noise ratio, R ∼ 2500 digital observations from both…
Spectral Classification of the 30 Doradus Stellar Populations
- N. Walborn, J. Blades
- Physics
- 1 October 1997
An optical spectral classification study of 106 OB stars within the 30 Doradus Nebula has sharpened the description of the spatial and temporal structures among the associated clusters. Five distinct…
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