Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...509a..13p&link_type=abstract
Astronomy and Astrophysics, Volume 509, id.A13
Astronomy and Astrophysics
Astrophysics
1
Planetary Nebulae: Individual: Hd 149427, Stars: Abundances, Stars: Fundamental Parameters
Scientific paper
Aims: We discuss the status of the A-type component of the binary central star in the peculiar planetary nebula HD 149427. Methods: We acquired low and high spectral resolution optical spectroscopy for the range 4500-9000 Å. Results: The analysis of the high resolution spectrum shows that the A-type star has an effective temperature of Teff = 8700 ± 150 K and a surface gravity of log g = 2.3 ± 0.4, corresponding to a spectral type A3-A4 II. These parameters infer a luminosity estimate of log(L/L&sun;) = 3.69 ± 0.32, implying a distance of 10 ± 0.6 kpc. The A-type star is slightly metal-poor; barium and strontium, two key elements for monitoring the s-process nucleosynthesis, are not enriched; nitrogen is enriched relative to Sun; while carbon and oxygen are underabundant. The photospheric abundance of the A-type giant star in HD 149427 is compared with the abundance in other types of stars at different evolutionary stages.
ARRAY(0x382e430)
Baella N. O.
Daflon Simone
Miranda Luis F.
Pereira Claudio Bastos
No associations
LandOfFree
High- and low-resolution spectroscopic observations of the peculiar planetary-nebula HD 149427 (=PC 11) 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 High- and low-resolution spectroscopic observations of the peculiar planetary-nebula HD 149427 (=PC 11), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High- and low-resolution spectroscopic observations of the peculiar planetary-nebula HD 149427 (=PC 11) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-960701