Abstract
view Abstract Citations (30) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectrophotometry of the extreme-ultraviolet star Feige 24. Liebert, J. ; Margon, B. Abstract Spectrophotometry of Feige 24, the second known extrasolar source of extreme-ultraviolet (100-1000 A) radiation, was obtained on six nights in 1975-1976. The data have 8-A resolution and span the region from 3800 to 8200 A. The two components of the system are classified as DAwk and M1-2 V, in agreement with previous inferences. The spectroscopic distance modulus of the system is estimated as + or - 1; the resulting absolute visual magnitude of 7.9 + or - 1 is consistent with the luminosities of either a composite white dwarf-red dwarf or a dwarf nova system. The spectra display strong hydrogen and He I emission which is highly variable on a time scale of days. These data are consistent with flare-star activity on the dM component; however, brief spectroscopic and photometric searches for more rapid emission-line variability were negative. It is more likely that the system is a close binary and that the variable emission is due to heating of the cool star by the intense ionizing flux from the hot white dwarf. Publication: The Astrophysical Journal Pub Date: August 1977 DOI: 10.1086/155437 Bibcode: 1977ApJ...216...18L Keywords: Binary Stars; Far Ultraviolet Radiation; Hot Stars; Stellar Spectrophotometry; White Dwarf Stars; Emission Spectra; Helium Ions; Line Spectra; Stellar Luminosity; Stellar Spectra; Ultraviolet Spectra; Astronomy full text sources ADS | data products SIMBAD (2)
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