Far UV Spectroscopy of eta Carinae

Details Far UV Spectroscopy of eta Carinae Far UV Spectroscopy of eta Carinae

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.4012i&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #40.12; Bulletin of the American Astronomical Society, Vol. 32, p.739

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first high spectral resolution observations of the Luminous Blue Variable eta Carinae between the Lyman limit and 1180 Angstroms. High resolution spectra (R 20,000) were obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite on Feb. 1 and Mar. 20, 2000. The observations were made with a 30x30 arcsec aperture and includes the entire Homunculus region. However, the spatial extent of the far UV flux is consistent with a point source. With the limited spatial resolution of the FUSE instrument, we can only constrain the far UV emission to be within +/- 5 arcsec of the star. The far UV spectrum of eta Car is dominated by strong absorption features of molecular hydrogen. The observed flux level at 1150 Angstroms is ~ 4 x 10-12 erg cm-2 sec-1 Angstroms-1 and decreases approximately linearly to ~ 920 Angstroms where converging H I and H2 features completely blanket the spectrum. These observations were obtained as part of the FUSE Early Release Observation program. This work was supported in part by NASA Contract NAS5-32985.

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