| 1986 — 1990 |
Stein, Wayne
Gehrz, Robert
Ney, Edward (co-PI) [⬀]
Jones, Terry (co-PI) [⬀] Jones, Terry (co-PI) [⬀] |
N/AActivity Code Description:
No activity code was retrieved: click on the grant title for more information |
Infrared Studies of Transient Activity Related to Dust in the Astrophysical Environment @ University of Minnesota-Twin Cities |
0.915 |
| 1990 — 1993 |
Stein, Wayne
Gehrz, Robert
Ney, Edward (co-PI) [⬀]
Jones, Terry (co-PI) [⬀] Jones, Terry (co-PI) [⬀] |
N/AActivity Code Description:
No activity code was retrieved: click on the grant title for more information |
Infrared Studies of Astrophysical Dust @ University of Minnesota-Twin Cities
Dust grains are produced abundantly in interstellar space, in particular as a byproduct of mass loss by stars. Examples are nova explosions, Wolf-Rayet stars, and virtually all red giant stars. In the course of time, dust grains intermingle with the interstellar medium, they undergo changes in structure, and they become incorporated in such objects as comets and meteoroids. The Principal Investigators (PIs) propose to continue with their current NSF-funded program of infrared observations of astro- physical dust grains. They will determine the chemical compositions, mineral properties, and size distributions of the grains in the three environments in which they are know to occur: stellar systems, interstellar medium, and solar system. Differences in the grains' properties are expected to yield information about the production and processing of condensable elements in the Galaxy due to stellar evolution. The results may help explain why supernova shocks and heating of the interstellar medium by young stars do not destroy interstellar dust, as theory predicts.
|
0.915 |
| 1993 — 2001 |
Gehrz, Robert
Ney, Edward (co-PI) [⬀]
Jones, Terry (co-PI) [⬀] Jones, Terry (co-PI) [⬀] |
N/AActivity Code Description:
No activity code was retrieved: click on the grant title for more information |
Infrared Studies of Transient Events: Classical Novae and Variable Stars @ University of Minnesota-Twin Cities
Interstellar grains are thought to form, among other places, in circumstellar flows from novae and infrared variable stars. Such objects will be observed in the infrared to learn about the nucleation and growth of grains in these environments, assess the heavy element contributions to the interstellar medium from novae and infrared variable stars, and gain information on stages of stellar evolution preceding the mass loss. A network of three remotely controlled infrared telescopes in three different states will make it possible to begin observations promptly after a nova eruption is detected to determine the composition of the ejecta and to follow the development of dust in the ejecta. The infrared variables will be monitored to learn their characteristics and to study the changes in the inner dust shell throughout the pulsational cycle.
|
0.915 |
| 2002 — 2006 |
Gehrz, Robert
Jones, Terry (co-PI) [⬀] Jones, Terry (co-PI) [⬀]
Woodward, Charles [⬀] |
N/AActivity Code Description:
No activity code was retrieved: click on the grant title for more information |
Ir Studies of the Circumstellar Environs of Evolved Stars @ University of Minnesota-Twin Cities
AST-0205814
PI Woodward
The interstellar medium is enriched with chemical elements synthesized in the interiors of stars and dust grains formed in their atmospheres. Stars accomplish this enrichment through mass outflows ranging in character from slow winds in post-main sequence, luminous evolved stars that operate over long time scales, to explosive events such as novae. By observing these outflows the process of chemical enrichment can be investigated. In particular IR observations will be carried out to provide abundance estimates for elements in the ejecta, such as C, N, O, Ne, Mg, Al, and Si, that can be used to assess the contributions of stellar winds to the interstellar medium. For a nova event prompt observations of sudden, transient activity at many wavelengths are required. This study will provide information about the stages of stellar evolution that are associated with mass loss, characterize the physical properties of astrophysical dust grains in circumstellar outflows, and assess the contributions that novae and luminous IR variable stars make to the grains and gas that constitute the interstellar medium.
***
|
0.915 |
| 2005 — 2006 |
Gehrz, Robert |
N/AActivity Code Description:
No activity code was retrieved: click on the grant title for more information |
National Science Foundation Division of Astronomical Sciences Town Meeting in Minneapolis @ University of Minnesota-Twin Cities
AST-0553633
PI: Robert Gehrz
INSTITUTION: University of Minnesota-Twin Cities
TITLE: NSF AST Town Meeting in Minneapolis
ABSTRACT
The Division of Astronomical Sciences is currently undertaking a "Senior Review" in which the balance of current and future NSF supported facilities are being examined. The primary goal is an adjustment of facilities support that will enable progress on the recommendations of the Decade Survey including operations funds for the Atacama Large Millimeter Array and other priorities (the Large Synoptic Survey Telescope, the Giant Segmented Mirror Telescope, etc.). At the same time, a healthy core program of astronomical research must be preserved (if not grown). This process is essential to support the scientific programs that will be undertaken with the next generation of facilities, to seed further capability, and to attract, train, and retain the next generation of astronomical researchers.
Here a "Town Hall Meeting" will be hosted by the University of Minnesota-Twin Cities on Friday, 7 October 2005 at a Minneapolis hotel to allow members of the astronomical community to provide input, interact face-to-face with Astronomical Sciences Division staff, ask questions, and express concerns. The comments and ideas collected during these meetings will be included in the process.
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0.915 |
