Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.306..903z&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 306, Issue 4, pp. 903-912.
Astronomy and Astrophysics
Astronomy
6
Scientific paper
High-resolution spectra and spectral-synthesis methods have been used to search for diffuse absorption bands in two protoplanetary nebulae candidate stars HD 179821 and SAO 34504. We have found strong evidence for eight diffuse bands (5780, 5797, 5850, 6196, 6270, 6614, 6660, 6699) in HD 179821. The mean value of the heliocentric velocity (V_solar) of these bands is -11.5kms^-1, which may be compared to V_solar ~= -11kms^-1 obtained for the Nai D12 interstellar component. A feature on the red wing of the diffuse interstellar band at 5780Å is likely to have a circumstellar origin. Its Doppler velocity is close to that for one of the Nai D12 absorption components. No significant interstellar absorption bands are detected in SAO 34504. However, we have found a number of unidentified absorption features. Those at 6196, 6597 and 5780Å may be diffuse circumstellar bands blueshifted with respect to the stellar velocity derived from the photospheric absorption lines, V_solar = -39.7kms^-1, in agreement with the expansion velocity of the circumstellar remnant derived from the radio observations, V_exp ~= 10kms^-1. The Nai D12 lines for SAO34504 consist of two absorption components at V_solar ~= -13 and -49kms^-1.
Schmidt Mirek R.
Szczerba Ryszard
Zacs Laimons
No associations
LandOfFree
A search for diffuse absorption bands in the spectra of two PPN candidate stars: HD 179821 and SAO 34504 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 search for diffuse absorption bands in the spectra of two PPN candidate stars: HD 179821 and SAO 34504, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A search for diffuse absorption bands in the spectra of two PPN candidate stars: HD 179821 and SAO 34504 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-997363