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Title:
η Carinae: Testing a Binary Orbit Model with the Hubble Space Telescope/Space Telescope Imaging Spectrograph
Authors:
Davidson, Kris; Ishibashi, Kazunori; Gull, Theodore R.; Humphreys, Roberta M.; Smith, Nathan
Publication:
The Astrophysical Journal, Volume 530, Issue 2, pp. L107-L110. (ApJ Homepage)
Publication Date:
02/2000
Origin:
UCP
ApJ Keywords:
STARS: INDIVIDUAL: CONSTELLATION NAME: Η CARINAE
DOI:
10.1086/312502
Bibliographic Code:
2000ApJ...530L.107D

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.
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