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The Red Rectangle: Its Shaping Mechanism and its Source of Ultraviolet Photons
Adolf N. Witt, Uma P. Vijh, L. M. Hobbs +3
The proto-planetary Red Rectangle nebula is powered by HD 44179, a spectroscopic binary (P = 318 d), in which a luminous post-AGB component is the primary source of both luminosity…
A Catalog of Diffuse Interstellar Bands in the Spectrum of HD 204827
L. M. Hobbs, D. G. York, T. P. Snow +8
Echelle spectra of the double-lined spectroscopic binary HD 204827 were obtained on five nights, at a resolving power R = 38,000 and with a S/N ratio = 750 near 6000 A in the final…
Abundances and Behavior of 12CO, 13CO, and C2 in Translucent Sight Lines
P. Sonnentrucker, D. E. Welty, J. A. Thorburn +1
Using UV spectra obtained with FUSE, HST, and/or IUE, we determine interstellar column densities of 12CO, 13CO, and/or C_2 for ten Galactic sight lines with 0.37<E(B-V)<0.72. The N…
VLT/UVES Observations of Interstellar Molecules and Diffuse Bands in the Magellanic Clouds
D. E. Welty, S. R. Federman, R. Gredel +2
We discuss the abundances of interstellar CH, CH+, and CN in the Magellanic Clouds (MC), derived from spectra of 7 SMC and 13 LMC stars obtained (mostly) with the VLT/UVES. CH and/…
Unusually Weak Diffuse Interstellar Bands toward HD 62542
T. P. Snow, D. E. Welty, J. Thorburn +4
As part of an extensive survey of diffuse interstellar bands (DIBs), we have obtained optical spectra of the moderately reddened B5V star HD 62542, which is known to have an unusua…
Rejection of the C7- Diffuse Interstellar Band Hypothesis
B. J. McCall, J. Thorburn, L. M. Hobbs +2
Using the new high resolution (~ 8 km/s) echelle spectrograph on the 3.5-m telescope at the Apache Point Observatory, we have begun a high sensitivity survey of the diffuse interst…