| Micrometeoroid and Orbital Debris Environments for the International Space Station |
15 DEC 2007 |
12 pages |
| Authors:
T. E. Gallini; J. A. Hackwell; D. C. Marin; Michael Zambran; Glenn E. Peterson; David K. Lynch; AEROSPACE CORP EL SEGUNDO CA
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 | Baseline micrometeoroid and orbital debris fluence estimates for spacecraft in low Earth orbit (LEO) are provided. For these calculations, an orbit similar to that of the International Space Station (ISS) is used. |
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| A New Probe of the Planet-Forming Region in T Tauri Disks |
20 OCT 2004 |
5 pages |
| Authors:
Edwin Bergin; Nuria Calvet; Michael L. Sitko; Herve Abgrall; Paola D'Alessio; Gregory J. Herczeg; Chunhua Qi; David K. Lynch; Suellen M. Brafford; R. B. Perry; AEROSPACE CORP LOS ANGELES CA
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| We present new observations of the far-ultraviolet (FUV; 1100 2200 A) radiation field and the near- to mid-IR (3-13.5 micron) spectral energy distribution (SED) of a sample of T Tauri stars selected on the basis of bright, molecular disks (GM Aur, DM Tau, and LkCa 15). In each source, we find evidence for Ly-alpha-induced H2 fluorescence and an additional source of FUV continuum emission below 1700 A. Comparison of the ... |
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| 0.8-13 Micron Spectroscopy of V838 Monocerotis and a Model for Its Emission |
20 MAY 2004 |
15 pages |
| Authors:
David K. Lynch; Catherine C. Venturini; W. Dimpfl; Lawrence S. Bernstein; Michael L. Sitko; Sergio Fajardo-Acosta; Alan Tokunaga; Roger Knacke; Richard C. Puetter; R. B. Perry; AEROSPACE CORP LOS ANGELES CA
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| We report on the results of a number of infrared spectra (0.8-2.5, 2.1-4.6, and 3-14 microns) of V838 Monocerotis, taken from a short time after discovery in 2002 January to about 14 months later, in early 2003. The spectrum evolved dramatically, changing from a quasi-photospheric stellar spectrum with weak atomic emission lines (some with P Cygni profiles) to one showing a wide range of deep absorption features indicative of a ... |
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| Time Development of Recurrent Nova CI Aquilae's 2000 Outburst Between 0.8 and 2.5 Microns |
FEB 2004 |
10 pages |
| Authors:
David K. Lynch; J. C. Wilson; Richard J. Rudy; Catherine Venturint; Stephan Mazuk; Neal A. Miller; Richard C. Puetter; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIGHT CENTER
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| We report 0.8 2.5 micrometer spectrophotometry of CI Aquilae at eight epochs between 2000 May 9 and 2001 June 2 UT, corresponding to approximately 3 and 391 days after peak brightness. Near peak brightness, the spectra showed emission lines that were characteristic of a low-excitation, nitrogen-rich shell. Within a few weeks, the spectra began to show higher excitation/ionization emission lines indicative of a harder illuminating source: the neutral metal lines ... |
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