ICCD Speckle Observations of Binary Stars. XXII. A Survey of Wolf-Rayet Starsfor Close Visual Companions

Details ICCD Speckle Observations of Binary Stars. XXII. A Survey of Wolf-Rayet Starsfor Close Visual Companions ICCD Speckle Observations of Binary Stars. XXII. A Survey of Wolf-Rayet Starsfor Close Visual Companions

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118..509h&link_type=abstract

The Astronomical Journal, Volume 118, Issue 1, pp. 509-514.

Astronomy and Astrophysics

Astronomy

14

Stars: Binaries: General, Stars: Binaries: Spectroscopic, Stars: Binaries: Visual, Stars: Individual: Alphanumeric: Wr 48, Stars: Individual: Constellation Name: Theta Muscae, Stars: Wolf-Rayet

Scientific paper

We present the results of a speckle interferometric survey for close visual companions, mainly among 29 of the apparently brightest Wolf-Rayet (W-R) stars. Only one target, WR 48 = theta Mus, was resolved as a close astrometric binary (with a separation of 46+/-9 mas). This system is probably a triple comprising a short-period W-R binary plus a distant O supergiant companion. Although our binary detection fraction is low, it is not an unexpected result given the selection effects that militate against easy detection of binaries. New, higher resolution observations will almost certainly increase the fraction of binaries. There are four known binaries among the six W-R stars in our sample that have nonthermal radio emission, and this connection supports the idea that the nonthermal emission originates in the wind-wind collision between components.

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