Optical Studies of UHURU Sources.IV. The Long-Term Behavior of HZ HERCULIS=HERCULES X-1

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Abstract

view Abstract Citations (80) References (5) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Optical Studies of UHURU Sources.IV. The Long-Term Behavior of HZ HERCULIS=HERCULES X-1 Jones, C. A. ; Forman, W. ; Liller, W. Abstract Harvard photographs of HZ Herculis taken during the period reveal the following: (1) The orbital period has remained constant at 1.70017 days to within two parts in l0 since 1900. (2) HZ Her does not always display the 1.7-day light variation. (3) When the 1.7-day variation is not detectable, one observes a second brightness fluctuation with an amplitude of Ampg =0.28 i 0.06 and a period half that of the orbital motion. Subject headings:variable stars - X-ray sources Publication: The Astrophysical Journal Pub Date: June 1973 DOI: 10.1086/181230 Bibcode: 1973ApJ...182L.109J full text sources ADS | data products SIMBAD (1) Related Materials (10) Part 1: 1972ApJ...175L..69E Part 2: 1972ApJ...177L.103F Part 4: 1973ApJ...183L.117F Part 5: 1973ApJ...184L..37L Part 6: 1973ApJ...184L.121J Part 7: 1974ApJ...190L...1J Part 8: 1974ApJ...192L..89L Part 9: 1975ApJ...195L..33G Part 10: 1975ApJ...200..171W Part 11: 1975ApJ...202L..13G

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