Open AccessHydroxyl lines towards Puppis A
Author(s) -
Woermann Beate,
Gaylard Michael J.,
Otrupcek Robina
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03575.x
Subject(s) - physics , astrophysics , supernova remnant , spectral line , emission spectrum , line (geometry) , excited state , radial velocity , astronomy , doubly ionized oxygen , supernova , atomic physics , stars , geometry , mathematics
The 1667‐MHz ground‐state hydroxyl (OH) line has been observed towards positions on Puppis A as well as in the immediate vicinity of this supernova remnant (SNR). The spectra at two positions on Puppis A show absorption lines at velocities less than +7.6 km s −1 , and emission lines above this velocity. Analysis of all four 18 cm OH lines indicates that Puppis A must lie between the OH clouds seen in absorption and emission, giving it a v lsr of +7.6 km s −1 . This implies that the kinematic distance to Puppis A is The OH clouds in front of Puppis A are slightly anomalously excited, as shown by analysis of the four 18 cm OH lines at the two observed positions on Puppis A. There is no evidence of any interaction of the SNR with the clouds in front of and behind it.