Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..645t&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 107, no. 2, p. 645-650
Astronomy and Astrophysics
Astronomy
22
Absorption Spectra, Atomic Spectra, Far Ultraviolet Radiation, Interstellar Matter, Line Spectra, Molecular Spectra, Ophiuchi Clouds, Ultraviolet Astronomy, Ultraviolet Spectra, Astronomical Spectroscopy, Hubble Space Telescope, Interstellar Gas, Spectrographs, Ultraviolet Spectroscopy
Scientific paper
Goddard High Resolution Spectrograph (GHRS) observations at 3.5 km/s resolution reveal several new weak unidentified interstellar absorption lines in the ultraviolet spectrum of zeta Ophiuchi. The unidentified line at 1369.13 A has the appearance and characteristics of a weak diffuse interstellar band (DIB). The line has a smooth profile similar to many optical diffuse interstellar bands (i.e., a shallow asymmetric profile), it is clearly broader than identified interstellar lines near it in wavelength, and its full width at half maximum in ergs is comparable to the widths of the weak optical DIBs. The asymmetric profile cannot be attributed to blended absorption from diffuse clouds at different velocities; at this resolution the two principal cloud complexes on the sight line at heliocentric velocities of -27 and -15 km/s are clearly separated. We compare this unidentified absorption feature to identified interstellar atomic and molecular absorption lines and optical DIBs observed on the zeta Oph and xi Per sight lines, and we conclude that it is reasonable to suggest that this absorption feature might be a DIB. This is not a unique interpretation however; the unidentified line could alternatively be due to gas in the zeta Oph H II region or a blend of unknown neutral atomic or molecular absorption lines.
Cardelli Jason A.
Savage Blair. D.
Tripp Todd M.
No associations
LandOfFree
A weak diffuse interstellar band in the far-ultraviolet spectrum of zeta Ophiuchi? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A weak diffuse interstellar band in the far-ultraviolet spectrum of zeta Ophiuchi?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A weak diffuse interstellar band in the far-ultraviolet spectrum of zeta Ophiuchi? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1013587