Near-infrared observations and optical identifications of a few unassociated IRAS sources with dust shells

Details Near-infrared observations and optical identifications of a few unassociated IRAS sources with dust shells Near-infrared observations and optical identifications of a few unassociated IRAS sources with dust shells

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...221..250i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 221, no. 2, Sept. 1989, p. 250-257.

Astronomy and Astrophysics

Astronomy

3

Carbon Stars, Cosmic Dust, Infrared Astronomy Satellite, Near Infrared Radiation, Stellar Envelopes, Astronomical Photometry, Color-Color Diagram, Silicon Carbides, Stellar Mass Ejection

Scientific paper

We have carried out near infrared observations of twenty six unassociated IRAS sources with dust shells. Twenty of these belong to the group that have IRAS low resolution spectral characteristic (LRSCHAR =4 n), classified as stars with carbon rich envelopes. Optical counterparts of 18 of these unassociated sources were identified using Palomar Observatory Sky Survey (POSS) prints.
The programme sources with LRSCHAR=4n as a class appear to have thicker dust shells than Two Micron Sky Survey (TM SS) sources of similar LRSCHAR, as evidenced by their larger K-[12] colours (>4.3). They thus represent more evolved sources, with high mass loss rates and are perhaps variables with periods >400 days. Their [12]-[25] and [25]-[60] colours are typical of black bodies with temperatures ranging from 400 to 1200K. The average K-[12] and [12]-[25] colours decrease with increasing SiC index, suggesting that the fractional abundance of SiC grains decreases with increasing mass loss rate.

Affiliated with

Also associated with

No associations

Rating

Near-infrared observations and optical identifications of a few unassociated IRAS sources with dust shells 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 Near-infrared observations and optical identifications of a few unassociated IRAS sources with dust shells, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near-infrared observations and optical identifications of a few unassociated IRAS sources with dust shells will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-760132