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 journalArticle

34 Citations (Scopus)

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)
JournalAstrophysical Journal
Volume530
Issue number2 PART 2
StatePublished - Feb 20 2000
Externally publishedYes

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spectrographs
spatial resolution
telescopes
wavelength
orbits
automobile
spectroscopy
Hubble Space Telescope
wavelengths
stars
high resolution
effect
parameter

Keywords

  • Stars: individual (η Carinae)

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

η Carinae : Testing a binary orbit model with the Hubble Space Telescopei/Space Telescope Imaging Spectrograph. / Davidson, Kris; Ishibashi, Kazunori; Gull, Theodore R.; Humphreys, Roberta M.; Smith, Nathan.

In: Astrophysical Journal, Vol. 530, No. 2 PART 2, 20.02.2000.

Research output: Contribution to journalArticle

Davidson, Kris ; Ishibashi, Kazunori ; Gull, Theodore R. ; Humphreys, Roberta M. ; Smith, Nathan. / η Carinae : Testing a binary orbit model with the Hubble Space Telescopei/Space Telescope Imaging Spectrograph. In: Astrophysical Journal. 2000 ; Vol. 530, No. 2 PART 2.
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