FGS Astrometry With Hubble Space Telescope: Parallaxes Of The Central Stars Of The Planetary Nebulae DeHt 5, Abell 31, NGC 7293, And NGC 6853

Details FGS Astrometry With Hubble Space Telescope: Parallaxes Of The Central Stars Of The Planetary Nebulae DeHt 5, Abell 31, NGC 7293, And NGC 6853 FGS Astrometry With Hubble Space Telescope: Parallaxes Of The Central Stars Of The Planetary Nebulae DeHt 5, Abell 31, NGC 7293, And NGC 6853

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335904b&link_type=abstract

American Astronomical Society, AAS Meeting #213, #359.04; Bulletin of the American Astronomical Society, Vol. 41, p.502

Astronomy and Astrophysics

Astronomy

Scientific paper

We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae DeHt 5, Abell 31, NGC 7293 (The Helix), and NGC 6853 (The Dumbbell). We obtain these with astrometric data from FGS 1R and FGS 3, white-light interferometers on HST. Proper motions, spectral classifications and multiple bandpass photometry of the stars comprising the astrometric reference frames provide spectrophotometric estimates of their absolute parallaxes. Introducing these into our model as observations with error, we determine absolute parallaxes for the central stars of each planetary nebula. Weighted averaging with previous independent ground-based trigonometric parallax measurements (Harris et al. 2007 AJ, 133, 631) yields an average absolute parallax precision of 5%. To obtain absolute magnitudes from these distances requires estimates of interstellar extinction. In addition to extinction measurements culled from the literature, we assume that each central star experiences the same extinction as a function of distance as do the reference stars nearest (in angular separation) to each central star. We also apply Lutz-Kelker bias corrections. The absolute magnitudes and effective temperatures of each central star permit estimates of central star radii. The planetary nebula central stars appear to have larger radii than cooler white dwarfs of similar mass.

Affiliated with

Also associated with

No associations

Rating

FGS Astrometry With Hubble Space Telescope: Parallaxes Of The Central Stars Of The Planetary Nebulae DeHt 5, Abell 31, NGC 7293, And NGC 6853 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 FGS Astrometry With Hubble Space Telescope: Parallaxes Of The Central Stars Of The Planetary Nebulae DeHt 5, Abell 31, NGC 7293, And NGC 6853, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FGS Astrometry With Hubble Space Telescope: Parallaxes Of The Central Stars Of The Planetary Nebulae DeHt 5, Abell 31, NGC 7293, And NGC 6853 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1700742