Issue |
A&A
Volume 422, Number 2, August I 2004
|
|
---|---|---|
Page(s) | 563 - 572 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20040195 | |
Published online | 09 July 2004 |
Me 1-1: A PN containing a cool star
1
Department of Astronomy, Peking University, Beijing 100871, PR China e-mail: shenzx@bac.pku.edu.cn
2
Osservatorio Astronomico di Trieste, via GB Tiepolo 11, 1-34131 Trieste, Italy
Received:
4
February
2004
Accepted:
5
March
2004
We report the detection of a cool stellar component at the center of
the planetary nebula (PN) Me 1-1 and present optical spectra of the system. From
measurements of nebular emission lines, we have derived electron temperature,
density and chemical composition. Heavy elemental abundances deduced from
collisionally excited lines (CELs) are compared with those derived from optical
recombination lines (ORLs). The electron temperature and density deduced from
the nebular analysis were used to calculate the nebular continuum emission, which was
then subtracted from the observed spectrum in order to obtain the spectrum of
the cool stellar component apparent in the observed spectrum. We calculate B
and V magnitudes of the cool companion and obtain a color index of
. By comparing the spectrum of the cool star with standard spectra in
Pickles's 1998 Stellar Flux Library, we find that the cool component has the
spectral type of a K3-4 bright giant. Our analysis suggests that Me 1-1 is
probably a yellow symbiotic system.
Key words: ISM: planetary nebulae: individual: Me 1-1 / stars: binaries: symbiotic
© ESO, 2004
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