Infrared spectra of the WN stars HD 50896 and HD 151932
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Bernat, A. P.↗
Engineering topics
Barnes, T. G.
Publications and source records attributed to Barnes, T. G..
A high-resolution infrared spectrum of IRC +10216
The IR-emitting core and shell of IRC +10216 are investigated using a high-resolution spectrum covering the wavelength interval between 3 and 5 microns. Line identifications made or confirmed include those due to (C-12)(O-16), (C-13)(O-16), (C-12)(O-17), and (C-12)(O-18). A mean heliocentric velocity of about -32 km/s is obtained from the 42 least blended (C-12)O and (C-13)O lines, and the following isotopic abundance ratios are derived by comparing equivalent widths of the observed lines: C-12/C-13, C-12/C-14, O-16/O-17, and O-17/O-18. The structure of the expanding gas shell is examined, an explanation is offered for the lack of P Cygni profiles in the spectrum, and an unsuccessful search for other molecules is briefly discussed. It is concluded that a low C-12/C-13 ratio is not necessarily a signature of a carbon star.
Barnes, T. G.↗
Silicon monoxide in the 4 micron infrared spectrum of long-period variables
The first-overtone sequence of vibration-rotation transitions of the free radical silicon monoxide are shown to have extreme phase-dependent variations in the spectra of two M-type long-period variables, Omicron Ceti and R Leonis, and the mild S-type long-period variable, Chi Cygni. At maximum light, the SiO band heads are not detectable. Near minimum light, the band heads of (Si-25)O are detected in the 4-micron spectra of all three stars. The band heads of the terrestrially less abundant isotopic species, (Si-29)O and (Si-30)O, are detected in Chi Cygni. Possible explanations of the phase-dependent behavior are discussed, and the role of the stellar chromosphere is considered.
Hinkle, K. H.↗
Field support, data analysis and associated research for the acoustic grenade sounding program
Temperature and horizontal winds in the 30 to 90 km altitude range of the upper atmosphere, were determined by acoustic grenade soundings conducted at Wallops Island, Virginia and Kourou, French Guiana. Field support provided at these locations included deployment of the large area microphone system, supervision, maintenance and operation of sound ranging stations; and coordination of activities. Data analysis efforts included the analysis of field data to determine upper atmospheric meteorological parameters. Profiles for upper atmospheric temperature, wind and density are provided in plots and tables for each of the acoustic grenade soundings conducted during the contract period. Research efforts were directed toward a systematic comparison of temperature data from acoustic grenade with other meteorological sensor probes in the upper atmosphere.
Barnes, T. G.↗
Infrared spectra of gamma-2 Velorum and zeta Puppis
Observations of gamma-2 Vel and zeta Pup are presented for the spectral region 5800-11,000 per cm, at resolutions of 2 and 4 per cm, respectively. This constitutes the first reported spectroscopy of a Wolf-Rayet star beyond 1.1 microns. The new spectral region contained numerous emission features for the WC8 component of gamma-2 Vel, but only the P-beta line in absorption for the O4f star zeta Pup. Line identifications are given for gamma-2 Vel and are shown to be consistent with visual spectroscopy. The species identified are H, He I-II, and C II-IV.
Barnes, T. G.↗
H2 quadrupole rotation-vibration lines in infrared spectra of cool stars
A discrepancy between results concerning the 2-0 band and the 1-0 band obtained by Spinrad (1966) and by other observers is considered, and preliminary results of a search for lines from the stronger 1-0 band are reported. The results are reviewed in the light of recent model-atmosphere calculations. It is suggested that alternative identifications for the 2-0 lines near 1 micron can be found and that the hydrogen molecule is a very minor contributor to these stellar features.
Lambert, D. L.↗
Jupiter - Observation of deuterated methane in the atmosphere.
During May 1971 a number of whole-planet spectra of Jupiter were obtained. Strongly evident in the spectrum of Jupiter are several J-manifolds in the P-branch of a band of CH3D. It is believed that this is the first observation of deuterium in any astronomical source. The spectrum of Jupiter is shown together with the spectrum of the sun, and a representation of a ratio of the spectrum of Jupiter to that of the sun.
Beer, R.↗