Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..103..301h&link_type=abstract
Astronomy and Astrophysics Suppl. 103, 301-313 (1994)
Astronomy and Astrophysics
Astrophysics
34
Scientific paper
We present OH maser observations of a sample of 62 IRAS-selected proto-planetary nebula (PPN) candidates, and CO observations of the 29 sources in this sample which are brighter than 25 Jy in the IRAS 25 μm band. Sixteen sources have been detected in (J=1-0) or (J=2-1). We observed and detected two sources in (J=3-2). We have detected sixteen sources (four of which are CO sources) in the 1612 MHz transition of OH. Half of these are also detected at 1667 and/or 1665 MHz. The CO and OH spectra are characteristic of emission from an expanding circumstellar shell, with an average expansion velocity of ~15 kms. The OH maser sources are not variable over a period of one to five years, with only a few exceptions. Several OH sources show multiple components in their spectra, sometimes strongly circularly polarized. One double-peak OH maser source, IRAS 20406+2953, shows an enigmatic variability in circular polarization.
Baas F.
Hu Jiang-Yao
Sahai Raghvendra
Slijkhuis F.
te Lintel Hekkert Peter
No associations
LandOfFree
A systematic study of IRAS selected proto-planetary nebula candidates. II. OH and CO observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A systematic study of IRAS selected proto-planetary nebula candidates. II. OH and CO observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A systematic study of IRAS selected proto-planetary nebula candidates. II. OH and CO observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1013356