A new luminous blue variable : R143 in 30 Doradus

• Main Author: Parker, Joel Wm.
• Publication Date: 1993
• Other Authors: Clayton, Geoffrey C., Winge, Claudia, Conti, Peter S.
• Format: Article
• Language: eng
• Source: Repositório Institucional da UFRGS
• Download full: http://hdl.handle.net/10183/108723
• topic: Nebulosas; Grande Nuvem de Magalhães; Estrelas variaveis; Estrelas supergigantes; Observações astronômicas no visível; ISM: individual (30 Doradus); Stars: variables: other (luminous blue variables); Supergiants

We have discovered that R143 in the Large Magellanic Cloud is a luminous blue variable (LBV), the first and perhaps the lone LBV in the central cluster of 30 Doradus, and only the sixth known LMC LBV. Photo­ metric and spectroscopic observations over the past 40 yr indicate that during that time R143 moved redward (changing from an F5 to F8 supergiant), then blueward (possibly becoming as early as 09.5), and is now moving back to the red (currently appearing as a late B supergiant). Similarly, the V magnitude of the star has changed by at least 1.4 mag. lmages of R143 show very unusual filaments of nebulosity extending from the star to a shell at a distance of 3.5 pc, perhaps due to a similar ejection mechanism that created the spiral jets and shell associated with AG Car, another LBV