Observations of Far-uv Absorption Lines at 2 km/s Resolution with IMAPS

Details Observations of Far-uv Absorption Lines at 2 km/s Resolution with IMAPS Observations of Far-uv Absorption Lines at 2 km/s Resolution with IMAPS

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.6505j&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #65.05; Bulletin of the American Astronomical Society, Vol. 26, p.968

Astronomy and Astrophysics

Astronomy

Scientific paper

The Interstellar Medium Absorption Profile Spectrograph (IMAPS) flew on the ORFEUS-Spas mission that was launched on STS-51 in September, 1993 for a joint science program sponsored by the US and German space agencies, NASA and DARA. IMAPS is an objective-grating echelle spectrograph that records the spectra of bright stars in the wavelength region 950-1150 Angstroms at a resolution of 1 to 2 km s(-1) . The central objective of IMAPS is to study the interstellar lines of H_2 and some key atomic species, but it is also useful for observing stellar phenomena. The following stars were observed: gamma Cas, alpha Eri, epsilon Ori, zeta Ori, kappa Ori, zeta Pup, gamma (2) Vel, beta Cru, eta UMa, and beta Cen A. Data processing is still underway, but we present some preliminary results, in particular, well resolved velocity components of H_2 toward epsilon and zeta Ori. In zeta Ori, H_2 at a heliocentric velocity v_&sun; ~ -2 km s(-1) shows pronounced changes in width for different rotational quantum numbers J, and ionized gas shown by the strong features of C II and N II can be seen over the velocity ranges -95 < v_&sun; < -70 and -45 < v_&sun; < +50 km s(-1) .

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