Eta Carinae: a long period binary?
نویسندگان
چکیده
منابع مشابه
The Orientation of the Eta Carinae Binary System
We examine a variety of observations that shed light on the orientation of the semi-major axis of the η Carinae massive binary system. Under several assumptions we study the following observations: The Doppler shifts of some He I P-Cygni lines that is attributed to the secondary’s wind, of one Fe II line that is attributed to the primary’s wind, and of the Paschen emission lines which are attri...
متن کاملComparing Eta Carinae with the Red Rectangle
I compare the structures of the bipolar nebulae around the massive binary system η Carinae and around the low mass binary system HD 44179. While η Carinae is on its way to become a supernova, the Red Rectangle is on its way to form a planetary nebula. Despite the two orders of magnitude difference in mass, these two systems show several similarities, both in the properties of the stellar binary...
متن کاملThe Systemic Velocity of Eta Carinae
High-resolution spectra of molecular hydrogen in the Homunculus nebula allow for the first direct measurement of the systemic velocity of η Carinae. Near-infrared longslit data for H2 1-0 S(1) λ21218 obtained with the Phoenix spectrometer on the Gemini South telescope give Vsys=−8.1±1 km s −1 (heliocentric), or VLSR=−19.7±1 km s , from the average of the near and far sides of the Homunculus. Th...
متن کاملEta Carinae across the 2003.5 Minimum: Spectroscopic Evidence for Massive Binary Interactions
We have analyzed high spatial, moderate spectral resolution observations of Eta Carinae (η Car) obtained with the Space Telescope Imaging Spectrograph (STIS) from 1998.0 to 2004.3. The data were obtained at discrete times covering an entire 2024 day spectroscopic cycle, with focus on the Xray/ionization low-state which began in 2003 June. The spectra show prominent P-Cygni lines in H I, Fe II a...
متن کاملEta Carinae and Other Luminous Blue Variables
Luminous Blue Variables (LBVs) are believed to be evolved, extremely massive stars close to the Eddington Limit and hence prone to bouts of large-scale, unstable mass loss. I discuss current understanding of the evolutionary state of these objects, the role duplicity may play and known physical characteristics of these stars using the X-ray luminous LBVs Eta Carinae and HD 5980 as test cases.
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ژورنال
عنوان ژورنال: New Astronomy
سال: 1997
ISSN: 1384-1076
DOI: 10.1016/s1384-1076(97)00008-0