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Be ursae majoris: a detached binary with a unique reprocessing spectrum
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Ferguson, Donald H. Green, Richard F. Willner, S. P. Liebert Sr., James Steiner, Joao E. Cutri, Roc Tokarz, Susan |
| Copyright Year | 1987 |
| Description | New infrared photometry, optical and UV spectrophotometry, and a photographic ephemeris are presented for the detached binary BE UMa. Results show the primary to be a DO white dwarf with an effective temperature of 80,000 + or - 15,000 K and a mass of 0.6 + or - 0.1 solar masses. No evidence is found for variability of the primary. The main sequence secondary star is shown to be of early M spectral type, with a formal range of M1 to M5 being possible. A reflection effect in reprocessed line and continuum radiation is produced by EUV radiation from the primary incident on the secondary atmosphere. It is suggested that the temperature of the reprocessed component of the secondary's atmosphere is in the 5000 to 8500 K range, and that emission lines of decreasing ionization form deeper in the irradiated envelope. Relatively narrow He II and high excitation metal lines are formed from recombination and continuum fluorescence processes. |
| File Size | 2531592 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19880007144 |
| Archival Resource Key | ark:/13960/t88h3hj1n |
| Language | English |
| Publisher Date | 1987-09-01 |
| Access Restriction | Open |
| Subject Keyword | Optics Stellar Spectra Eclipsing Binary Stars White Dwarf Stars Stellar Temperature Stellar Mass Ultraviolet Spectra Visible Spectrum Main Sequence Stars Ephemerides Infrared Spectra M Stars Early Stars Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
