Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.6606l&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #66.06; Bulletin of the American Astronomical Society, Vol. 31, p.929
Astronomy and Astrophysics
Astronomy
Scientific paper
High-resolution spectra were obtained with Hubble's Space Telescope Imaging Spectrograph (STIS) for the cool Mira-type variable star R Leo on 31 December 1998. This star was at phase 0.37 in its light-curve cycle on this date. The recorded spectra are truly remarkable! They show a plethora of emission features that were too faint for either the International Ultraviolet Explorer (IUE) or the HST first-generation Goddard High-Resolution Spectrograph (HRS) to record. Comparisons will be made between these STIS spectra and earlier HRS and IUE spectra for this star. Emission lines, previously unrecorded in a Mira, were detected including the Fe 2 (UV33,35,158,160,161,180,181), Mn 2 (UV38), V 2 (UV43,73), Zr 2 (UV58), and the Ni 2 (UV36) multiplets, in addition to the well known singly ionized multiplets that have been observed in the past. The electron density diagnostic multiplet of C 2] (UV0.01) gives an electron density of 10(9) cm(-3) for R Leo at this phase. This is similar to that found for the Mira star R Hya at phase 0.26 with HST/HRS spectra. Finally, the photospheric spectrum was detected from 2980 Angstroms (the long wavelength cut-off) down to 2450 Angstroms. Prominent absorption features in this photospheric spectrum will also be identified.
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