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dc.contributor.authorDrake, JJ
dc.contributor.authorNess, JU
dc.contributor.authorStarrfield, S
dc.contributor.authorBurwitz, V
dc.contributor.authorWichmann, R
dc.contributor.authorHauschildt, P
dc.contributor.authorWagner, RM
dc.contributor.authorBond, HE
dc.contributor.authorKrautter, J
dc.contributor.authorOrio, M
dc.contributor.authorBALMAN, Şölen
dc.contributor.authorHernanz, M
dc.contributor.authorGehrz, RD
dc.contributor.authorWoodward, CE
dc.contributor.authorButt, Y
dc.contributor.authorMukai, K
dc.contributor.authorTruran, JW
dc.date.accessioned2021-03-05T20:22:31Z
dc.date.available2021-03-05T20:22:31Z
dc.date.issued2003
dc.identifier.citationNess J., Starrfield S., Burwitz V., Wichmann R., Hauschildt P., Drake J., Wagner R., Bond H., Krautter J., Orio M., et al., "A Chandra low energy transmission grating spectrometer observation of V4743 Sagittarii: A supersoft X-ray source and a violently variable light curve", ASTROPHYSICAL JOURNAL, cilt.594, 2003
dc.identifier.issn0004-637X
dc.identifier.otherav_d3db4178-980e-4f62-a914-e3fe5b23ab80
dc.identifier.othervv_1032021
dc.identifier.urihttp://hdl.handle.net/20.500.12627/139836
dc.identifier.urihttps://doi.org/10.1086/378664
dc.description.abstractV4743 Sagittarii ( Nova Sgr 2002 No. 3) was discovered on 2002 September 20. We obtained a 5 ks ACIS-S spectrum in 2002 November and found that the nova was faint in X-rays. We then obtained a 25 ks Chandra Low Energy Transmission Grating Spectrometer (LETGS) observation on 2003 March 19. By this time, it had evolved into the supersoft X-ray phase exhibiting a continuous spectrum with deep absorption features. The light curve from the observation showed large-amplitude oscillations with a period of 1325 s ( 22 minutes) followed by a decline in the total count rate after similar to13 ks of observations. The count rate dropped from similar to 40 counts s(-1) to practically zero within similar to 6 ks and stayed low for the rest of the observation (similar to 6 ks). The spectral hardness ratio changed from maxima to minima in correlation with the oscillations and then became significantly softer during the decay. Strong H-like and He-like lines of oxygen, nitrogen, and carbon were found in absorption during the bright phase, indicating temperatures between 1 and 2 MK, but they were shifted in wavelength corresponding to a Doppler velocity of - 2400 km s(-1). The spectrum obtained after the decline in count rate showed emission lines of C vi, N vi, and N VII, suggesting that we were seeing expanding gas ejected during the outburst, probably originating from CNO-cycled material. An XMM-Newton Target of Opportunity observation, obtained on 2002 April 4 and a later LETGS observation from 2003 July 18 also showed oscillations, but with smaller amplitudes.
dc.language.isoeng
dc.subjectUzay bilimi
dc.subjectTemel Bilimler
dc.subjectASTRONOMİ VE ASTROFİZİK
dc.subjectFizik
dc.subjectTemel Bilimler (SCI)
dc.subjectAstronomi ve Astrofizik
dc.titleA Chandra low energy transmission grating spectrometer observation of V4743 Sagittarii: A supersoft X-ray source and a violently variable light curve
dc.typeMakale
dc.relation.journalASTROPHYSICAL JOURNAL
dc.contributor.department, ,
dc.identifier.volume594
dc.identifier.issue2
dc.contributor.firstauthorID2212653


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