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58 Matching Results
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Radiation-driven evolution of low-mass x-ray binaries and the formation of millisecond pulsars
Recent data on low-mass X-ray binaries (LMXBs) and millisecond pulsars (MSPs) pose a challenge to evolutionary theories which neglect the effects of disk and comparison irradiation. Here we discuss the main features of a radiation-driven (RD) evolutionary model that may be applicable to several LMXBs. According to this model, radiation from the accreting compact star in LMXBs vaporizes'' the accretion disk and the companion star by driving a self-sustained mass loss until a sudden accretion-turn off occurs. The main characteristics of the RD-evolution are: (1) lifetime of RD-LMXB's is of order 10{sup 7} years or less; (2) both the orbital period gap and the X-ray luminosity may be consequences of RD-evolution of LMXB's containing lower main sequence and degeneration companion stars; (3) the companion star may transfer mass to the primary even if it underfills its Roche lobe; (4) a class of recycled MSPs can continue to vaporize the low-mass companions by a strong pulsar wind even after the accretion turn-off; (5) the RD-evolutionary model resolves the apparent statistical descrepancy between the number of MSPs and their LMXB progenitors in the Galaxy. We discuss the implications of the discovery of single MSPs in low-density globular clusters and the recent measurements …
Date:
August 8, 1991
Creator:
Tavani, M. (Lawrence Livermore National Lab., CA (United States) California Univ., Berkeley, CA (United States). Dept. of Astronomy)
Object Type:
Article
System:
The UNT Digital Library
[Press release: Human Rights Campaign Fund calls on Cheney to "cease enforcement" of anti-gay and lesbian policy]
Press release from the Human Rights Foundation calling on the Pentagon to cease enforcement of its policy excluding lesbians and gay men from military service.
Date:
August 8, 1991
Creator:
Human Rights Capaign Fund
Object Type:
Text
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 83, No. 32, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
August 8, 1991
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 143, No. 27, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
August 8, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
San Antonio Register (San Antonio, Tex.), Vol. 60, No. 17, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Glosson, Edwin
Object Type:
Newspaper
System:
The Portal to Texas History
[News Clip: Frost]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
August 8, 1991, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
The North Texas Daily (Denton, Tex.), Vol. 73, No. 118, Ed. 1 Thursday, August 8, 1991
Student newspaper from the University of North Texas in Denton, Texas that includes local, state, national, and campus news along with advertising. Formerly The Campus Chat.
Date:
August 8, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Olney Enterprise (Olney, Tex.), Vol. 82, No. 32, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Olney, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Penn, David H.
Object Type:
Newspaper
System:
The Portal to Texas History
The Teague Chronicle (Teague, Tex.), Vol. 85, No. 10, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Teague, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Massey, Steve
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 101, No. 32, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
August 8, 1991
Creator:
Ezzell, Ben & Ezzell, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Jewish Post (Fort Worth, Tex.), Vol. 45, No. 32, Ed. 1 Thursday, August 8, 1991
Weekly Jewish newspaper from Fort Worth, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 8, 1991
Creator:
Wisch, J. A. & Wisch, Rene
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 69, No. 241, Ed. 1 Thursday, August 8, 1991
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Odem-Edroy Times (Odem, Tex.), Vol. 40, No. 32, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Odem, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Priddy, Travis
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 109, No. 63, Ed. 1 Thursday, August 8, 1991
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
August 8, 1991
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 32, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Archer City, Texas that includes local, state and national news along with advertising.
Date:
August 8, 1991
Creator:
Lobpries, F. Mike & Lobpries, Fran
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 105, No. 32, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 8, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Talco Times (Talco, Tex.), Vol. 56, No. 26, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Talco, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Nichols, Thomas & Nichols, Nanalee
Object Type:
Newspaper
System:
The Portal to Texas History
Vaporizing neutron stars in low-mass x-ray binaries and the statistics of millisecond pulsars
Recent data on low-mass X-ray binaries (LMXBs) and msec pulsars (MSPs) pose a challenge to evolutionary which neglect the effects of disk and companion irradiation. Here we discuss the main features of a radiation-driven (RD) evolutionary model that may be applicable to several LMXBs. According to this model, irradiation from the accreting compact star LMXBs vaporizes'' the accretion disk and the companion star by driving a self-sustained mass loss until a sudden accretion-turn of occurs. The main characteristics of the RD-evolution are: (1) the lifetime of RD-LMXB's is of order 10{sup 7} years or less: (2) both the orbital period gap and the X-ray luminosity may be consequences of RD-evolution of LMXB's containing lower main sequence and degenerate companion stars; (3) the companion star may transfer mass to the primary even if it underfills its Roche lobe; (4) the recycled msec pulsar can continue to vaporize the low-mass companion star even after the accretion turn-off produced by a strong pulsar wind; (5) the RD-evolutionary model resolves the apparent statistical discrepancy between the number of MSP's and their LMXB progenitors. 14 refs., 1 fig., 1 tab.
Date:
August 8, 1991
Creator:
Tavani, M. (California Univ., Livermore, CA (United States). Inst. of Geophysics and Planetary Physics)
Object Type:
Article
System:
The UNT Digital Library
Bogata News (Bogata, Tex.), Vol. 79, No. 41, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Stamford American (Stamford, Tex.), Vol. 70, No. 19, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Stamford, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Mathis, Chandra
Object Type:
Newspaper
System:
The Portal to Texas History
The Rio Grande Herald (Rio Grande City, Tex.), Vol. 80, No. 87, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Rio Grande City, Texas that includes local, state and national news along with extensive advertising.
Date:
August 8, 1991
Creator:
Roberts, Kenneth
Object Type:
Newspaper
System:
The Portal to Texas History
The Muskogee - Okmulgee Oklahoma Eagle (Muskogee and Okmulgee, Okla.), Vol. 19, No. 15, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Muskogee and Okmulgee, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 91, No. 130, Ed. 1 Thursday, August 8, 1991
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Lomenick, Rick
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Llano News (Llano, Tex.), Vol. 101, No. 42, Ed. 1 Thursday, August 8, 1991
Weekly newspaper from Llano, Texas that includes local, state, and national news along with advertising.
Date:
August 8, 1991
Creator:
Buckner, Walter L.
Object Type:
Newspaper
System:
The Portal to Texas History