The bipolar structure of the LBV nebula around HR Carinae

K. Weis, W. J. Duschl, D. J. Bomans, You-Hua Chu, M. D. Joner

Research output: Contribution to journalArticlepeer-review

Abstract

HR Carinae is one of the few Luminous Blue Variables (LBVs) in the Galaxy. It has a nebula that appears bipolar. We have obtained imaging and high-dispersion, long-slit echelle data of the HR Car nebula, and confirmed that it is a bipolar nebula. Its polar axis lies along the position angle of 125±5°; each lobe has, at a distance of 5 kpc a diameter of ∼ 0.65 pc and a line-of-sight expansion velocity of 75 - 150km s-1. Beside the expanding bipolar lobes, a number of [N II]-bright knots are detected. These knots have lower expansion velocities than the lobes and are detected only within the projected boundary of the lobes. These knots are most likely nitrogen-enriched material ejected by HR Car. On a larger scale, a funnel-shaped nebula is detected at 2′.5 northwest of HR Car. The axis of the funnel is roughly aligned with the polar axis of the HR Car nebula, suggesting that HR Car may be responsible for the ionization and shaping of this nebula. Future observations of kinematics and abundances are needed to determine the nature of this nebula. We propose that the bipolar nebula of HR Car is a more evolved version of the Homunculus Nebula around η Car. The recently developed theory of wind-compressed disks may explain the higher density of the equatorial plane and the formation of bipolar nebulae of LBVs.

Original languageEnglish (US)
Pages (from-to)568-574
Number of pages7
JournalAstronomy and Astrophysics
Volume320
Issue number2
StatePublished - Apr 10 1997

Keywords

  • ISM: bubbles: jets and outflows
  • Stars: evolution
  • Stars: individual: HR Car; η Car
  • Stars: mass-loss

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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