ICCD Speckle Observations of Binary Stars. XIV. A brief Survey for Duplicity Among White Dwarf Stars

Abstract

view Abstract Citations (13) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS ICCD Speckle Observations of Binary Stars. XIV. A brief Survey for Duplicity Among White Dwarf Stars McAlister, Harold A. ; Mason, Brian D. ; Hartkopf, William I. ; Roberts, Lewis C., Jr. ; Shara, Michael M. Abstract Speckle observations were obtained in 1988 of the white dwarf stars GD 294, GD 140, GD 319, HZ 43, and LHS 354 at the 3.6-m Canada-France-Hawaii Telescope. Faint, red companions to GD 319 and HZ 43 were detected, and the companion to GD 319 confirmed at the 4-m telescope on Kitt Peak in 1993. Additional observations have subsequently been measured at the 100-in. telescope on Mt. Wilson and the 4-m telescope on Cerro Tololo. In addition to the first precise measurements of the position angles and angular separations of the secondaries for these two objects, we present values for ΔV as well. We demonstrate that the companion to GD 319 is optical while that for HZ 43 is physical in nature. Publication: The Astronomical Journal Pub Date: September 1996 DOI: 10.1086/118086 Bibcode: 1996AJ....112.1169M Keywords: WHITE DWARFS; SURVEYS; BINARIES: GENERAL full text sources ADS | data products SIMBAD (5) Related Materials (20) Part 1: 1987AJ.....93..183M Part 2: 1987AJ.....93..688M Part 3: 1987AJ.....94.1318L Part 4: 1989AJ.....97..510M Part 5: 1990AJ.....99..965M Part 6: 1992AJ....104..810H Part 7: 1993AJ....105..220M Part 8: 1993AJ....106..352H Part 9: 1993AJ....106..637M Part 10: 1993AJ....106.1639M Part 11: 1994AJ....108.2299H Part 12: 1996AJ....111..393A Part 13: 1996AJ....111..936H Part 15: 1996AJ....112.2260M Part 16: 1997AJ....114.1623F Part 17: 1997AJ....114.1639H Part 18: 1997AJ....114.2112M Part 19: 1998AJ....115..821M Part 20: 1999AJ....118..509H Part 21: 2000AJ....119.3084H