η Carinae: Testing a binary orbit model with the Hubble Space Telescopei/Space Telescope Imaging Spectrograph

Kris Davidson, Kazunori Ishibashi, Theodore R. Gull, Roberta M. Humphreys, Nathan Smith

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Ground-based spectroscopy of η Car shows periodic changes in some emission-line wavelengths. These variations have been cited as strong evidence that this object is a 5.5 yr binary system and have been used to produce specific orbit models. High spatial resolution data obtained with the Hubble Space Telescope/Space Telescope Imaging Spectrograph, however, do not confirm the predicted velocity behavior; therefore, the published orbit models are almost certainly invalid. Wavelength fluctuations seen at ground-based spatial resolution most likely result from other effects, which we describe. If this object is a binary system (which has not been proven), then the parameters of the secondary star and of the orbit remain largely unknown.

Original languageEnglish (US)
Pages (from-to)L107-L110
JournalAstrophysical Journal
Volume530
Issue number2 PART 2
DOIs
StatePublished - Feb 20 2000
Externally publishedYes

Keywords

  • Stars: individual (η Carinae)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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