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Post Info TOPIC: Kronberger 61
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Kn 61
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Title: An spectroscopic and photometric study of the planetary nebulae Kn 61 and Pa 5
Author: Ma. T. García-Díaz, D. González-Buitrago, J. A. López, S. Zharikov, G. Tovmassian, N. Borisov, G. Valyavin

We present the first morpho-kinematical analysis of the planetary nebulae Kn 61 and Pa 5 and explore the nature of their central stars. Our analysis is based on high resolution and medium resolution spectroscopic observations, deep narrow-band imaging, and integral photometry. This material allows us to identify the morphological components and study their kinematics. The direct images and spectra indicate an absence of the characteristic [N II] and [S II] emission lines in both nebulae. The nebular spectrum of Kn 61 suggests an hydrogen deficient planetary nebula and the stellar spectrum of the central star reveals a hydrogen deficient PG 1159-type star. The [O III] position velocity diagram reveals that Kn 61 is a closed, empty, spherical shell with a thin border and a filamentary surface expanding at 67.6 km s-1, and the shell is currently not expanding isotropically. We derived a kinematic age of ~ 1.6 x 10^4 yrs for an assumed distance of 4 kpc. A photometric period of ~ 5.7(±0.4) days has been detected for Kn 61, indicating presence of a possible binary system at its core. A possible link between filamentary, spherical shells and PG 1159-type stars is noted. The morphology of Pa 5 is dominated by an equatorial toroid and faint polar extensions. The equatorial region of this planetary nebula is expanding at 45.2 kms-1. The stellar spectrum corresponds to a very hot star and is dominated by a steep blue rising continuum and He II, Balmer and Ca II photospheric lines.

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Blobrana


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Kn61 Planetary Nebula
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New Planetary Nebula Revealed by Kepler

A planetary nebula called Kronberger 61, or Kn61, has been discovered on NASA's Kepler mission, and may help solve the question of whether stellar companions are key in the formation of such nebulae.
The purpose of Kepler's planet finding mission is to determine the number and frequency of habitable Earth-sized planets orbiting sun-like stars.
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Blobrana


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RE: Kronberger 61
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Title: New faint planetary nebulae from the DSS and SDSS
Authors: Matthias Kronberger, George H. Jacoby, Orsola De Marco, Dimitri Douchin, David Frew, Dianne Harmer, Steve Howell, Quentin Parker, Dana Patchick, Dave Riddle

Recent H surveys such as SHS and IPHAS have almost doubled the number of known planetary nebulae (PNe) in our Galaxy. However, both surveys are restricted to Milky Way regions close to the Galactic plane. Thus, it is likely that a population of unknown PNe exists also at higher Galactic latitudes that is still awaiting discovery.
The lack of high-resolution H imagery requires the use of other methods in order to search for new PNe in these regions. Possibilities are the visual inspection of multicolour Digitised Sky Survey (DSS) and Sloan Digitised Sky Survey (SDSS) images, and the survey for narrowband emitters on combined [OIII], H and [SII] images. The application of these two methods in fields mostly complementary to those covered by SHS and IPHAS has lead so far to the discovery of more than 100 PN candidates. In a first observing campaign, 76 of the candidates were imaged with the WIYN 3.5m and the OHP 1.2m telescopes, of which 60 were found to be possible or probable PNe. Spectroscopic studies of 51 of the targets, including two previously unobserved candidates, confirmed 44 as PNe. Of the remaining 11 targets without spectra, 10 have a high probability of being PNe based on their morphology alone.
This work presents narrowband images of about 15 candidates that were not included in the previous campaign. We note that one of the candidates (Kn 61) is located within the target field of the Kepler satellite mission.

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Gemini Image Captures Elegant Beauty of Planetary Nebula Discovered by Amateur Astronomer

In a partnership between amateur and professional astronomers, the recent discovery of a dying star's last gasps could help resolve a decades-old debate among astronomers. That is, are stellar companions key to the formation and structure of planetary nebulae?
The discovery, by Austrian amateur astronomer Matthias Kronberger, is featured at an International Astronomical Union symposium on planetary nebulae this week in Spain's Canary Islands. The research team's work features a striking image of the new nebula obtained with the Gemini Observatory.
Not coincidently, the location of the new nebula (named Kronberger 61, or Kn 61, after its discoverer) is within a relatively small patch of sky being intensely monitored by NASA's Kepler planet finding mission. Kepler's goal is to determine the frequency of Earth-sized planets around Sun-like stars. In the process, the effects of other close stellar and/or planetary companions are detectable.
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