Discovery of a 283-second periodic variation in the X-ray source 3U 0900-40
A 283 s periodic pulsation in the X-ray system 3U 0900--40 has been discovered during observations by the SAS-3 X-ray observatory. Pulse profiles of the 283 s periodicity are presented in five energy intervals covering the range 1--30 keV for the period 1975 July 19.4--23.9. The averaged profile is...
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| Veröffentlicht in: | Astrophys. J., Lett.; (United States) Lett.; (United States), 1976-06, Vol.206, p.L99 |
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| container_title | Astrophys. J., Lett.; (United States) |
| container_volume | 206 |
| creator | McClintock, J. E. Rappaport, S. Joss, P. C. Bradt, H. Buff, J. Clark, G. W. Hearn, D. Lewin, W. H. G. Matilsky, T. Mayer, W. Primini, F. |
| description | A 283 s periodic pulsation in the X-ray system 3U 0900--40 has been discovered during observations by the SAS-3 X-ray observatory. Pulse profiles of the 283 s periodicity are presented in five energy intervals covering the range 1--30 keV for the period 1975 July 19.4--23.9. The averaged profile is relatively simple at higher energies and is markedly more complex at lower energies. The peak 1--40 keV intensity observed for the source is 1.2 x 10/sup -8/ ergs cm/sup -2/ s/sup -1/, which corresponds to a luminosity of 2.1 x 10/sup 36/ ergs s/sup -1/ at a distance of 1.2 kpc. A search for soft X-ray emission (E |
| doi_str_mv | 10.1086/182142 |
| format | Article |
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E. ; Rappaport, S. ; Joss, P. C. ; Bradt, H. ; Buff, J. ; Clark, G. W. ; Hearn, D. ; Lewin, W. H. G. ; Matilsky, T. ; Mayer, W. ; Primini, F.</creator><creatorcontrib>McClintock, J. E. ; Rappaport, S. ; Joss, P. C. ; Bradt, H. ; Buff, J. ; Clark, G. W. ; Hearn, D. ; Lewin, W. H. G. ; Matilsky, T. ; Mayer, W. ; Primini, F. ; Department of Physics and Center for Space Research, Massachusetts Institute of Technology</creatorcontrib><description>A 283 s periodic pulsation in the X-ray system 3U 0900--40 has been discovered during observations by the SAS-3 X-ray observatory. Pulse profiles of the 283 s periodicity are presented in five energy intervals covering the range 1--30 keV for the period 1975 July 19.4--23.9. The averaged profile is relatively simple at higher energies and is markedly more complex at lower energies. The peak 1--40 keV intensity observed for the source is 1.2 x 10/sup -8/ ergs cm/sup -2/ s/sup -1/, which corresponds to a luminosity of 2.1 x 10/sup 36/ ergs s/sup -1/ at a distance of 1.2 kpc. A search for soft X-ray emission (E<1 keV) yielded upper limits of 2 x 10/sup -11/ and 5 x 10/sup -11/ ergs cm/sup -2/ s/sup -1/ in the energy intervals 0.16--0.28 keV and 0.5--0.7 keV, respectively. 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G.</creatorcontrib><creatorcontrib>Matilsky, T.</creatorcontrib><creatorcontrib>Mayer, W.</creatorcontrib><creatorcontrib>Primini, F.</creatorcontrib><creatorcontrib>Department of Physics and Center for Space Research, Massachusetts Institute of Technology</creatorcontrib><title>Discovery of a 283-second periodic variation in the X-ray source 3U 0900-40</title><title>Astrophys. J., Lett.; (United States)</title><description>A 283 s periodic pulsation in the X-ray system 3U 0900--40 has been discovered during observations by the SAS-3 X-ray observatory. Pulse profiles of the 283 s periodicity are presented in five energy intervals covering the range 1--30 keV for the period 1975 July 19.4--23.9. The averaged profile is relatively simple at higher energies and is markedly more complex at lower energies. The peak 1--40 keV intensity observed for the source is 1.2 x 10/sup -8/ ergs cm/sup -2/ s/sup -1/, which corresponds to a luminosity of 2.1 x 10/sup 36/ ergs s/sup -1/ at a distance of 1.2 kpc. A search for soft X-ray emission (E<1 keV) yielded upper limits of 2 x 10/sup -11/ and 5 x 10/sup -11/ ergs cm/sup -2/ s/sup -1/ in the energy intervals 0.16--0.28 keV and 0.5--0.7 keV, respectively. 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E.</creatorcontrib><creatorcontrib>Rappaport, S.</creatorcontrib><creatorcontrib>Joss, P. C.</creatorcontrib><creatorcontrib>Bradt, H.</creatorcontrib><creatorcontrib>Buff, J.</creatorcontrib><creatorcontrib>Clark, G. W.</creatorcontrib><creatorcontrib>Hearn, D.</creatorcontrib><creatorcontrib>Lewin, W. H. G.</creatorcontrib><creatorcontrib>Matilsky, T.</creatorcontrib><creatorcontrib>Mayer, W.</creatorcontrib><creatorcontrib>Primini, F.</creatorcontrib><creatorcontrib>Department of Physics and Center for Space Research, Massachusetts Institute of Technology</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Astrophys. J., Lett.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>McClintock, J. E.</au><au>Rappaport, S.</au><au>Joss, P. C.</au><au>Bradt, H.</au><au>Buff, J.</au><au>Clark, G. W.</au><au>Hearn, D.</au><au>Lewin, W. H. G.</au><au>Matilsky, T.</au><au>Mayer, W.</au><au>Primini, F.</au><aucorp>Department of Physics and Center for Space Research, Massachusetts Institute of Technology</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Discovery of a 283-second periodic variation in the X-ray source 3U 0900-40</atitle><jtitle>Astrophys. J., Lett.; (United States)</jtitle><date>1976-06-01</date><risdate>1976</risdate><volume>206</volume><spage>L99</spage><pages>L99-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>A 283 s periodic pulsation in the X-ray system 3U 0900--40 has been discovered during observations by the SAS-3 X-ray observatory. Pulse profiles of the 283 s periodicity are presented in five energy intervals covering the range 1--30 keV for the period 1975 July 19.4--23.9. The averaged profile is relatively simple at higher energies and is markedly more complex at lower energies. The peak 1--40 keV intensity observed for the source is 1.2 x 10/sup -8/ ergs cm/sup -2/ s/sup -1/, which corresponds to a luminosity of 2.1 x 10/sup 36/ ergs s/sup -1/ at a distance of 1.2 kpc. A search for soft X-ray emission (E<1 keV) yielded upper limits of 2 x 10/sup -11/ and 5 x 10/sup -11/ ergs cm/sup -2/ s/sup -1/ in the energy intervals 0.16--0.28 keV and 0.5--0.7 keV, respectively. (AIP)</abstract><cop>United States</cop><doi>10.1086/182142</doi><oa>free_for_read</oa></addata></record> |
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| ispartof | Astrophys. J., Lett.; (United States), 1976-06, Vol.206, p.L99 |
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| language | eng |
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| source | Alma/SFX Local Collection |
| subjects | 640103 - Astrophysics & Cosmology- Quasi-Stellar, Radio, & X-Ray Sources- (-1987) BINARY STARS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COSMIC RADIO SOURCES COSMIC RAY SOURCES COSMIC X-RAY SOURCES ELECTROMAGNETIC RADIATION IONIZING RADIATIONS NEUTRON STARS PULSARS PULSATIONS RADIATIONS SOFT X RADIATION STARS VARIABLE STARS X RADIATION |
| title | Discovery of a 283-second periodic variation in the X-ray source 3U 0900-40 |
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