dc.contributor.author |
Parthasarathy, M |
|
dc.contributor.author |
Muthumariappan, C |
|
dc.contributor.author |
Muneer, S |
|
dc.date.accessioned |
2021-06-25T13:29:23Z |
|
dc.date.available |
2021-06-25T13:29:23Z |
|
dc.date.issued |
2020-07 |
|
dc.identifier.citation |
Astrophysics and Space Science, Vol. 365, No. 7, 127 |
en_US |
dc.identifier.issn |
1572-946X |
|
dc.identifier.uri |
http://hdl.handle.net/2248/7704 |
|
dc.description |
Restricted Access |
en_US |
dc.description |
The original publication is available at springerlink.com |
|
dc.description.abstract |
We present medium resolution (1000) K-band
spectra of 12 post-AGB candidates and related stars. For
several objects in our sample, these spectra were obtained
for the first time. The Brγ line in emission is detected
in seven objects indicating the onset of photo-ionization
in these objects. Four objects show the presence of an
He I line. We detect H2 emission line in the spectra of
IRAS 06556+1623, IRAS 22023+5249, IRAS 18062+2410
and IRAS 20462+3416. The H2 emission line ratio 1-0
S(1)/2-1 S(1) indicates that H2 is radiatively excited due
to the UV radiation of hot post-AGB central stars. When
compared with the recent observations by other investigators,
the Brγ and H2 emission fluxes varied in some of
the objects. The hot post-AGB stars IRAS 22495+5134,
IRAS 22023+5249, IRAS 18062+2410 and IRAS 20462+
3416 seem to be evolving rapidly to the young low excitation
planetary nebula phase. The spectra of the objects presented
in this paper may be useful for future observers as some of
these stars show spectral variation and since the post-AGB
evolution of some of these stars is relatively rapid. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Springer Nature |
en_US |
dc.relation.uri |
https://doi.org/10.1007/s10509-020-03834-1 |
|
dc.rights |
© Springer Nature |
|
dc.subject |
Stars: AGB and post-AGB |
en_US |
dc.subject |
Stars: circumstellar matter |
en_US |
dc.subject |
Stars: evolution |
en_US |
dc.subject |
Stars: mass-loss |
en_US |
dc.subject |
Infrared: ISM |
en_US |
dc.title |
K-band spectra of selected post-AGB candidates |
en_US |
dc.type |
Article |
en_US |