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Variations in the uv spectrum of a centauri
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Fahey, R. P. |
| Copyright Year | 1981 |
| Description | Equivalent width and central depth measurements of the ultraviolet absorption lines from the spectrum of the He I variable star a Cen HD 125823 are presented. The measurements are from 53 short wavelength, and 45 long wavelength, high resolution spectrographs taken with the IUE satellite over a 25 day period during July and August of 1978. Central depth measurements were of lines of Cr III, Mn III, V III, C III, Si II, and S II seen in the region between 1245 and 1255 A. Equivalent widths are of the three He I 2(3)s-n(3po) transitions found at 2945, 2829 and 2764 A. The period for cyclic intensity variations in He I is determined using a four parameter, least squares fit to a sinusoid. The IUE observations match both a period of 8.8163 + or - 0.0003 days and a previously unreported period of 9.2532 + or - 0.0003 days with equal minima for the least squares fit. The phase of Cr III maximum relative to He I maximum is found to be 0.53 cycles for the IUE observations. |
| File Size | 250097 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810017379 |
| Archival Resource Key | ark:/13960/t1dk07x52 |
| Language | English |
| Publisher Date | 1981-01-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Stellar Spectra Least Squares Method Variations Iue Chromium Abundance Line Spectra Helium Variable Stars Energy Absorption Ultraviolet Astronomy Spectral Line Width Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
