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Radio emission from hot stars at two centimeters

  • Donald C. Morton (a1) and Alan E. Wright (a1)

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Radio fluxes of 7.2 ± 1.1 and 69 ± 5 mJy at 14.7 GHz have been detected from the stars ζ Pup (O4If) and γ Vel (WC8+O9I) respectively with the 64-m telescope at Parkes, and upper limits have been determined for 9 more hot stars. The interpretation of these fluxes as free-free emission from a shell of ionized gas resulting from a stellar wind gives mass-loss rates = (6.5 ± 1.4) x 10−6 M yr−1 for ζ Pup and (3.9 ± 0.7) x 10−5 M yr−1 for γ Vel if H/He = 10 by number and the He is fully ionized. If the gas around γ Vel originates mainly from the WC8 star, the helium predominates and = (5.2 ± 0.9) x 10−5 or (17 ± 3) x 10−5 M yr−1 depending on whether the helium is doubly or singly ionized.

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References

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Radio emission from hot stars at two centimeters

  • Donald C. Morton (a1) and Alan E. Wright (a1)

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