other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2012MNRAS.425..997I - Mon. Not. R. Astron. Soc., 425, 997-1006 (2012/September-2)
The chemical composition of the post-asymptotic giant branch f supergiant CRL 2688.
ISHIGAKI M.N., PARTHASARATHY M., REDDY B.E., GARCIA-LARIO P., TAKEDA Y., AOKI W., GARCIA-HERNANDEZ D.A. and MANCHADO A.
Abstract (from CDS):
We confirm that the central star shows a spectrum typical of an F-type supergiant with Teff= 7250±400K, logg = 0.5 and [Fe/H] = -0.3±0.1dex. We find that the abundance pattern of this object is characterized by enhancements of carbon ([C/Fe] = 0.6±0.1), nitrogen ([N/Fe] = 1.0±0.3) and Na ([Na/Fe] = 0.7±0.1), similar to other previously known carbon-rich post-AGB stars. Yttrium is also enhanced, while the [Ba/Y] ratio is very low (-1.0), indicating that only the light s-process elements are enhanced. The zinc abundance is found to be normal, [Zn/Fe] = 0.0±0.3, suggesting that there is no depletion of refractory elements. The Hα, NaI and KI resonance lines show prominent emission components, the heliocentric radial velocities of which are offset by -41±3km/s relative to the photospheric metal-absorption lines. The molecular features of C2 and CN also show emission components, the velocities of which are consistent with the emission components of the Hα, NaI and KI lines. On the other hand, their absorption components are more highly blueshifted than the corresponding emission components, which suggests that the regions where the emission and absorption components arise are expanding at different velocities.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS
Journal keyword(s): stars: abundances - stars: AGB and post-AGB - circumstellar matter - stars: evolution - stars: individual: CRL 2688
CDS comments: In Chap 3.3 : IRAS 06530-0123 is a misprint for IRAS 06530-0213.
Simbad objects: 4
To bookmark this query, right click on this link: simbad:2012MNRAS.425..997I and select 'bookmark this link' or equivalent in the popup menu