Proper motion and kinematics of the ansae in NGC 7009

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dc.contributor.authorFernández, R
dc.contributor.authorMonteiro, H
dc.contributor.authorSchwarz, HE
dc.date.accessioned2025-01-21T01:08:13Z
dc.date.available2025-01-21T01:08:13Z
dc.date.issued2004
dc.description.abstractWe have measured the proper motion (PM) and kinematics of the ansae in NGC 7009 using high-dispersion echelle spectra and archive narrowband Hubble Space Telescope images. Assuming that the ansae are moving at equal and opposite velocities from the central star, we obtain a system radial velocity of -53 +/- 2 km s(-1), the eastern ansa approaching and the western ansa receding at v(r) = 5.3 +/- 1 km s(-1) with respect to this value. The PM of the eastern ansa is 28 +/- 8 mas yr(-1), which, with our weighted distance to NGC 7009 of 0.86 +/- 0.34 kpc, gives V-exp = 114 +/- 32 km s-(1). The electron temperature and density in both ansae were determined to be T-e similar to 9000 +/- 400 K and n(e) similar to 2300 +/- 400 cm(-3). The dynamic age of the ansae is similar to910 +/- 260 yr, and the implied PM of the central star is mu(CS) = 1 +/- 0.5 mas yr(-1). This is in qualitative but not quantitative agreement with previous work.
dc.fuente.origenWOS
dc.identifier.issn0004-637X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96442
dc.identifier.wosidWOS:000220300600020
dc.issue.numero2
dc.language.isoen
dc.pagina.final598
dc.pagina.inicio595
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectastrometry
dc.subjectISM : kinematics and dynamics
dc.subjectplanetary nebulae : individual (NGC 7009)
dc.titleProper motion and kinematics of the ansae in NGC 7009
dc.typeartículo
dc.volumen603
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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