285 resultados para Selden, Barb
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We provide a complete characterization of the astrophysical properties of the σ Ori Aa, Ab, B hierarchical triple system and an improved set of orbital parameters for the highly eccentric σ Ori Aa, Ab spectroscopic binary. We compiled a spectroscopic data set comprising 90 high-resolution spectra covering a total time span of 1963 days. We applied the Lehman-Filhés method for a detailed orbital analysis of the radial velocity curves and performed a combined quantitative spectroscopic analysis of the σ Ori Aa, Ab, B system by means of the stellar atmosphere code FASTWIND. We used our own plus other available information on photometry and distance to the system for measuring the radii, luminosities, and spectroscopic masses of the three components. We also inferred evolutionary masses and stellar ages using the Bayesian code BONNSAI. The orbital analysis of the new radial velocity curves led to a very accurate orbital solution of the σ Ori Aa, Ab pair. We provided indirect arguments indicating that σ Ori B is a fast-rotating early B dwarf. The FASTWIND+BONNSAI analysis showed that the Aa, Ab pair contains the hottest and most massive components of the triple system while σ Ori B is a bit cooler and less massive. The derived stellar ages of the inner pair are intriguingly younger than the one widely accepted for the σ Orionis cluster, at 3 ± 1 Ma. The outcome of this study will be of key importance for a precise determination of the distance to the σ Orionis cluster, the interpretation of the strong X-ray emission detected for σ Ori Aa, Ab, B, and the investigation of the formation and evolution of multiple massive stellar systems and substellar objects.
Resumo:
Context. It appears that most (if not all) massive stars are born in multiple systems. At the same time, the most massive binaries are hard to find owing to their low numbers throughout the Galaxy and the implied large distances and extinctions. Aims. We want to study LS III +46 11, identified in this paper as a very massive binary; another nearby massive system, LS III +46 12; and the surrounding stellar cluster, Berkeley 90. Methods. Most of the data used in this paper are multi-epoch high S/N optical spectra, although we also use Lucky Imaging and archival photometry. The spectra are reduced with dedicated pipelines and processed with our own software, such as a spectroscopic-orbit code, CHORIZOS, and MGB. Results. LS III +46 11 is identified as a new very early O-type spectroscopic binary [O3.5 If* + O3.5 If*] and LS III +46 12 as another early O-type system [O4.5 V((f))]. We measure a 97.2-day period for LS III +46 11 and derive minimum masses of 38.80 ± 0.83 M⊙ and 35.60 ± 0.77 M⊙ for its two stars. We measure the extinction to both stars, estimate the distance, search for optical companions, and study the surrounding cluster. In doing so, a variable extinction is found as well as discrepant results for the distance. We discuss possible explanations and suggest that LS III +46 12 may be a hidden binary system where the companion is currently undetected.
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li-Aḥmad al-Barbīr.
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Left to right: Res. of Geo. F. Richards, Sec. 16, York Tp. Mich.; Res. of Selden Orr, Sec. 16, York Tp. Mich.; Res. of John Coe, Sec. 3, York Tp. Mich.; Res. of E. Pearson, Sec. 11, York Tp. Mich.; Res. of Geo. Coe, Sec. 8, York Tp. Mich.; Milan House, Lyman Burnham, Proprietor, Milan, York Tp. Mich. Publication information: Chicago, Ill. : Everts & Stewart, 1874.
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Top Row: Dick Bodycomb, Gus Eaton, Bud Marshall, Tony Cybulski, Herb Taggart, Bob Kash, Burl Selden (ass't coach), Cliff Keen (coach).
Third Row: Gene Kiddon, Gordon Smith, Vaughn Lowther, Jim Coleman, Larry Shaw, James Johnson, Frank Whitehouse, Gene Freed, Everet Knapp, George Sipp, Stan Emerling.
Second Row: Bill Clark, James Richter, Jack Keller, Dave Bradbury Fred Koehn, Hyman Berman, Bill Parshall, Bill Connoly, M. Richard Fleishman, Frank Murphy, Jim Briskin, Leon Hinz.
Bottom Row: John Wilcox, Prentice Ryan, Ed Morey, Jim Costa, Barry Breakey, Jere Ogle, Jim Armelagos, Don O'Connell, Jerry Burns, John Picard, James Sakai, Ted Karmazin.
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front row: coach Theo Shepherd, Susan Weber, Laura Danuff, Whit Stodghill
back row: Barb Fischley, Kathy Karzen, Ann Kercher, Lisa Wood, Kathy Krickstein
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Back Row: Jill VanStee, Leslie Spicer, Vonnie Thompson, Tempie Brown, Carol Szzcechowski
Middle Row: Lorea Feldman, Lisa Reynolds, Joan Rieger, Tanya Powell, Mary Rosowski
Front Row: Sarah Basford, Barb Loeher
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Back Row: ass't coach Kathy LaBarge, Debbie Norman, head coach Bud VanDeWege, trainer Sue Peel, ? ass't trainer
Middle Row: Barb Loeher, Carol Szczechowski, Tanya Powell, Jill VanStee, Lisa Reynolds, Joan Rieger, Mary Rosowski, Leslie Spicer, Tempie Brown
Front Row: Sarah Basford, Vonnie Thompson, Lorea Feldman
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Back Row: ?, Leslie Spicer, Mary Rosowski, Joan Rieger, ass't coach Debbie Norman, head coach Bud VanDeWege, ass't coach Kathy LaBarge, Val Hall, Sue Anne Cleary, Torie Shaw, ?,
Front Row: Bridget Venturie, Tempie Brown, Barb Loeher, Tanya Powell, Leah Wooldridge, Char Durand, Carol Szczechowski
Resumo:
Back Row: ass't coach Kathy LaBarge, ass't coach Debbie Norman, Stacie McCall, Jen Nuanes, Char Durand, Jill VanStee, Trish Andrew, Torie Shaw, Nikki Beaudry, Leah Wooldridge, trainer Sue Peel, head coach Bud VanDeWege
Front Row: ?, Barb Loeher, Tempie Brown, Joan Rieger, Tanya Powell, Val Hall, Leslie Spicer, Carol Szczechowski, ?
not pictured: Michelle Hall, Kristen Dierdorf
Resumo:
Back Row: Joan Rieger, Trish Andrew, Val Hall, Michelle Hall, Torie Shaw, Jill VanStee
Middle Row: Tanya Powell, Carol Szczechowski, Nikki Beaudry, Leslie Spicer, Tempie Brown, Kristin Dierdorf
Front Row: Barb Loeher, Jen Nuanes, Stacy McCall, Leah Wooldridge, Char Durand,
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Back Row: Char Durand, Sherell Stanly, LaTara Jones, Valerie Turner, Jennifer Nuanes
Middle Row: Yeshimbra Gray, Michelle Hall, Trish Andrew, Rhonda Jokisch, Nikki Beaudry, Jill VanStee
Front Row: Stacie McCall, captain Carol Szczehowski, Leah Wooldridge
Not pictured: Barb Loeher, Torie Shaw
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Front Row: Kimber Johnston, Karyn Heiney, Tammy Herremans Jamie Spohn, Carol Cocuzza.
Middle Row: Roberta Salay, Michelle Weipert, Beth Major, Carol Ratza, Jackie Madison, Ginny Witter.
Back Row: assistant coach Barb Wise, Lisa Holmes, Marianne Thomas, Sue Cramer, Karel Pennington, Jeanne Sellman, Jane Doty, head coach Sandy Vong.
Resumo:
Back Row:: Barb Canning, Janice Margulies, Carol Ratza, Jackie Madison, Linda Cunningham, Amy Blake, Coach Sandy Vong.
Front Row: Alison Noble, Susan Rogers, Kerri Kenniston, Robin Vissers, Julie Stotesbury, Jeanne Weckler.
Resumo:
Front Row: Jeanne Weckler, Lana Ramthun, Alison Noble, Sue Rogers, Joan Potter, and Deborah Holloway.
Back Row: Asst. Coach Barb Canning, Carla Dearing, Maura Jones, Karyn Kunzelman, Kim Edwards, Jennifer Hickman, Suzanne Harris, coach Sandy Vong.