Accession Number : AD0700686

Title :   AN ATTEMPT TO DETECT NEUTRAL HYDROGEN IN PLANETARY NEBULAE,

Corporate Author : CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY

Personal Author(s) : Thompson,A. R. ; Colvin,R. S.

Report Date : 1969

Pagination or Media Count : 13

Abstract : Six planetary nebulae were observed at the frequency of the 21 cm hydrogen line in an attempt to detect absorption of the thermal radio emission in neutral hydrogen in the outer parts of the nebulae. No evidence of such neutral gas was detected, and in two cases an upper limit of 0.12 solar mass can be placed on the HI mass if the observations are interpreted in terms of a spherically-symmetrical model and the temperature of the neutral gas is = or < 100 degrees K. (Author)

Descriptors :   (*NEBULAE, *HYDROGEN), (*EXTRATERRESTRIAL RADIO WAVES, DETECTION), INTERSTELLAR MATTER

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE