Fundamental parameters of the highly reddened young open clustersWesterlund 1 and 2

1998/02/01 by Andrés E. Piatti, E. Bica, Joan Clària · 11 citations
Physics and Astronomy · Engineering · Earth and Planetary Sciences · #Stellar, planetary, and galactic studies #Chalcogenide Semiconductor Thin Films #Atmospheric Ozone and Climate

paper · pdf · doi:10.1051/aas:1998111

openalex publication_date 1998/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

We study the compact open clusters Westerlund 1 (BH 197) and Westerlund 2. We present CCD integrated spectroscopy for both clusters, and CCD imaging in the V and I bands for the former one. So far, Westerlund 1 is possibly the most reddened open cluster studied in detail (). It has an age of 8 ± 3 Myr and a distance from the Sun of kpc. For Westerlund 2 we derive a visual absorption mag, an age of 2-3 Myr, and kpc. From luminosity and structural arguments we conclude that Westerlund 1, although young and compact, it is a massive cluster, in contrast to Westerlund 2.

Cited by

• On the massive stellar population of the super star cluster Westerlund 1
• A VLT/FLAMES survey for massive binaries in Westerlund 1
• Diffuse, Nonthermal X‐Ray Emission from the Galactic Star Cluster Westerlund 1
• Very low-mass stellar content of the young supermassive Galactic star cluster Westerlund 1
• Diffuse thermal X-ray emission in the core of the young massive cluster Westerlund 1
• Discovery of extended VHEγ-ray emission from the vicinity of the young massive stellar cluster Westerlund 1
• ChandraX-Ray Imaging of the Interacting Starburst Galaxy System NGC 7714/7715: Tidal Ultraluminous X-Ray Sources, Emergent Wind, and Resolved HiiRegions
• What do dynamical cluster masses really tell us about dynamics?
• The Villafranca catalog of Galactic OB groups
• THE STARBURST CLUSTER WESTERLUND 1: THE INITIAL MASS FUNCTION AND MASS SEGREGATION
• Westerlund 1 W26 [wikipedia]