We consider here the nebular phase spectra of supernovae whose late time luminosity is provided by the radioactive decay of /sup 56/Ni and /sup 56/Co synthesized in the explosion. A broad variety of supernovae are known or suspected to fall in this category. This includes all SNIa and SNIb, and at least some SNII, in particular SN1987a. At sufficiently late times the expanding supernova becomes basically nebular in character due to its decreasing optical depth. The spectra produced during this stage contain information on the density and abundance structure of the entire supernova, as opposed to spectra near maximum light which are affected only by the outermost layers. A numerical model for nebular spectrum formation is therefore potentially very valuable for answering currently outstanding questions about the post-explosion supernova structure. As an example, we can hope to determine the degree of mixing which occurs between the layers of the ''onion-skin'' abundance structure predicted by current one dimensional explosion calculations. In the sections which follow, such a numerical model is briefly described and then applied to SN1972e, a typical SNIa, SN1985f, an SNIb, and finally to SN1987a. In the case of SN1987a predicted spectra are presented for the wavelength range from …

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "The grand prize," a reconstructive sculpture by Murray Kreloff will be given away."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Iowa State's Barnaba Korir raises his arms after winning the Big Eight men's cross country title."

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Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Sumer Hightower of Chappell Hill, Texas, works her horse, Hyglo Freckles, Friday night at the Lazy E."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Remington Park's barns are evidence of the progress being made at the Oklahoma City racetrack."

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification; Reconsideration of Attorney General Opinion JM-422: Whether the same person may serve as justice of the peace and part time appointed municipal judge of a city within the same county precinct

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification; Whether a conviction for the offense of issuing a bad check will bar a prosecution for theft where both offenses arise out of the same transaction

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Photo of the 1987 UNT indoor drum line, the "A" Line, taken at the Adam's Mark Hotel in St. Louis, Missouri. This was the fourth consecutive championship of the UNT "A" Line at the Percussive Arts Society International Conference (PASIC) Marching Forum contest. Members of the 1987 "A" Line were Shawn Schietroma, Randy Knudson, Brian West, Julie Sutton, Noel Perez, Dan "Wojo" Wojciechowski, Jeff Moore, Dale Yager, Chris Mulvey, Greg Beck, Doug Patko, Jim Riley, Jamie Luzzi, John Buckholz, Mark Keefer, Bill Rankin, Steve McDonald, Dale Baker, Jon Lee, Ricardo Bozas, Fred Ganter, John Rindom, Brian Jones, Kendall Hibbs, Mike Hernandez, Jim Parsons, Jason Sutter, Mike Pless, Pat Riland, Mark Nester and featured instructors Kevin Hammond, Mike Kolesar, and Kennan Wylie.

Daily newspaper from Hereford, Texas that includes local, state, and national news along with advertising.

Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.

Weekly newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Kevin Seitzer baseball player of Kansas City Royals, 9 year old Mark Floyd, Norman."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Kansas City Royals third baseman Kevin Seitzer signs an autograph for a fan at a baseball card show Saturday afternoon at the Regency Inn."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Linda Lavin (right) stars as a courageous Jewish woman who saves 100 abandoned children from poverty and prejudice in a post-World War II Poland in "Lena: My 100 Children," a compelling fact-based World Premiere drama to be telecast on NBC Monday Night at the Movies, Nov. 23. Vicky Wauchope (left) portrays one of the children."

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Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Southern Nazarene University's Dale Richards (11) and Mike Lindsay (3) defend against Oklahoma City's Rob Reynolds in college soccer action Tuesday."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oklahoma City Unuversity's Jed Ray Jones and Southern Nazarene University's Magnuss Karlsson go head to head in Tuesday's District 9 soccer action."

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Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Vina L. Showers, the first black women to be named to the Federal Aviation Administration senior executive service, stands amid the complex machinery of the FAA Mike Monroney Aeronautical Center depot."