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- ID:
- ivo://CDS.VizieR/J/MNRAS/431/2
- Title:
- H{alpha} fluxes of Galactic planetary nebulae
- Short Name:
- J/MNRAS/431/2
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalogue of new integrated H{alpha} fluxes for 1258 Galactic planetary nebulae (PNe), with the majority, totalling 1234, measured from the Southern H{alpha} Sky Survey Atlas (SHASSA) and/or the Virginia Tech Spectral-line Survey (VTSS). Aperture photometry on the continuum-subtracted digital images was performed to extract H{alpha}+[NII] fluxes in the case of SHASSA, and H{alpha} fluxes from VTSS. The [NII] contribution was then deconvolved from the SHASSA flux using spectrophotometric data taken from the literature or derived by us. Comparison with previous work shows that the flux scale presented here has no significant zero-point error. Our catalogue is the largest compilation of homogeneously derived PN fluxes in any waveband yet measured, and will be an important legacy and fresh benchmark for the community. Amongst its many applications, it can be used to determine statistical distances for these PNe, determine new absolute magnitudes for delineating the faint end of the PN luminosity function, provide baseline data for photoionization and hydrodynamical modelling, and allow better estimates of Zanstra temperatures for PN central stars with accurate optical photometry. We also provide total H{alpha} fluxes for another 75 objects which were formerly classified as PNe, as well as independent reddening determinations for ~270 PNe, derived from a comparison of our H{alpha} data with the best literature H{beta} fluxes. In an appendix, we list corrected H{alpha} fluxes for 49 PNe taken from the literature, including 24 PNe not detected on SHASSA or VTSS, re-calibrated to a common zero-point.
- ID:
- ivo://CDS.VizieR/J/PAZh/35/574
- Title:
- He, C, N and O abundances in planetary nebulae
- Short Name:
- J/PAZh/35/574
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The He, C, N, and O abundances in more than 120 planetary nebulae (PNe) of our Galaxy and the Magellanic Clouds have been redetermined by analyzing new PNe observations. The characteristics of PNe obtained by modeling their spectra have been used to compile a new catalog of parameters for Galactic and extragalactic PNe, which is accessible at http://www.astro.spbu.ru/staff/afk/GalChemEvol.html. The errors in the parameters of PNe and their elemental abundances related to inaccuracies in the observational data have been analyzed. The He abundance is determined with an accuracy of 0.06dex, while the errors in the C, N, and O abundances are 0.1-0.2dex. Taking into account the inaccuracies in the corrections for the ionization stages of the elements whose lines are absent in the PNe spectra increases the errors in the He abundance to 0.1dex and in the C, N, and O abundances to 0.2-0.3dex. The elemental abundances in PNe of various Galactic subsystems and the Magellanic Clouds have been analyzed. This analysis suggests that the Galactic bulge objects are similar to type II PNe in Peimbert's classification, whose progenitor stars belong to the thin-disk population with ages of at least 4-6Gyr. A similarity between the elemental abundances in PNe of the Magellanic Clouds and the Galactic halo has been established.
- ID:
- ivo://CDS.VizieR/J/A+A/537/A1
- Title:
- Infrared fluxes of HII regions and PNe
- Short Name:
- J/A+A/537/A1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We determine infrared color criteria for distinguishing between HII regions and planetary nebulae.
- ID:
- ivo://CDS.VizieR/J/MNRAS/396/1915
- Title:
- Infrared photometry of Galactic and MC PN
- Short Name:
- J/MNRAS/396/1915
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present mid-infrared (MIR) photometry for 367 Galactic disc, bulge and Large Magellanic Cloud (LMC) planetary nebulae (PNe), determined using data acquired with the Spitzer Space Telescope, and through the Legacy Programs GLIMPSE II (Galactic Legacy Infrared Mid-plane Survey Extraordinaire II) and SAGE (Surveying the Agents of the Galaxy's Evolution). This has permitted us to make a comparison between the luminosity functions of bulge and LMC PNe, and between the MIR colours of all three categories of source. It is determined that whilst the 3.6 {mu}m luminosity functions of the LMC and bulge sources are likely to be closely similar, the [3.6]-[5.8] and [5.8]-[8-0] indices of LMC nebulae are different from those of their disc and bulge counterparts. This may arise because of enhanced 6.2{mu}m polycyclic aromatic hydrocarbon emission within the LMC sources, and/or as a result of further, and more radical differences between the spectra of LMC and Galactic PNe. We also determine that the more evolved disc sources listed in the Macquarie/AAO/Strasbourg (MASH) catalogues of Parker et al. (2006MNRAS.373...79P) and Miszalski et al. (2008MNRAS.384..525M), Cat. V/127, have similar colours to those of the less evolved (and higher surface brightness) sources in the catalogue of Acker et al. (Cat. V/84), a result which appears at variance with previous studies of these sources.
- ID:
- ivo://CDS.VizieR/J/A+A/541/A98
- Title:
- Interacting planetary nebulae
- Short Name:
- J/A+A/541/A98
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We discuss the classification and orientation of planetary nebulae that interact with the interstellar medium throughout the Milky Way. A sample of 117 confirmed interacting planetary nebulae is used for this purpose. Our results indicate that the majority of interacting objects are located close to the Galactic plane, and ~77% of them are located inside the Galactic thin disk.
- ID:
- ivo://CDS.VizieR/J/MNRAS/443/3388
- Title:
- IPHAS new extended planetary nebulae release 1
- Short Name:
- J/MNRAS/443/3388
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first results of our search for new, extended planetary nebulae (PNe) based on careful, systematic, visual scrutiny of the imaging data from the Isaac Newton Telescope Photometric Halpha Survey of the Northern Galactic plane (IPHAS). The newly uncovered PNe will help to improve the census of this important population of Galactic objects that serve as key windows into the late-stage evolution of low- to intermediate-mass stars. They will also facilitate study of the faint end of the ensemble Galactic PN luminosity function. The sensitivity and coverage of IPHAS allows PNe to be found in regions of greater extinction in the Galactic plane and/or those PNe in a more advanced evolutionary state and at larger distances compared to the general Galactic PN population. Using a set of newly revised optical diagnostic diagrams in combination with access to a powerful, new, multiwavelength imaging data base, we have identified 159 true, likely and possible PNe for this first catalogue release. The ability of IPHAS to unveil PNe at low Galactic latitudes and towards the Galactic Anticentre, compared to previous surveys, makes this survey an ideal tool to contribute to the improvement of our knowledge of the whole Galactic PN population.
- ID:
- ivo://CDS.VizieR/J/MNRAS/394/1875
- Title:
- IR colours of MASH planetary nebulae
- Short Name:
- J/MNRAS/394/1875
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have analysed the near-infrared (NIR) and far-infrared (FIR) colours of MASH I and MASH II (the Macquarie/AAO/Strasbourg surveys, Cat. <V/127>) planetary nebulae (PNe), using data deriving from the Two-Micron All-Sky Survey and Infrared Astronomical Satellite. We were able to identify ~5 per cent of the sources in the NIR, and a slightly larger fraction (~12 per cent) in the FIR. It is concluded that whilst the NIR colours of these nebulae are consistent with those of less evolved (and higher surface brightness) PNe, their FIR colours are markedly different. This disparity is likely to arise as a result of an evolution in dust temperatures, in their line emission characteristics, and in the relative contributions of the 8.6 and 11.3um polycyclic aromatic hydrocarbon emission features. A rump of~9 per cent of the detected sources have values log[F(25um)/F(60um)] which are lower than can be explained in terms of normal nebular evolution, however. If these are comparable in nature to the undetected PNe, then this would argue that ~1 in 10 of MASH I and II nebulae may represent galactic H ii regions, Stromgren spheres, symbiotic nebulae or other unrelated categories of source.
- ID:
- ivo://CDS.VizieR/J/PAZh/33/657
- Title:
- JHKLM photometry of eight planetary nebulae
- Short Name:
- J/PAZh/33/657
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We discuss the infrared (IR) (1.25-5microns) photometry of eight planetary nebulae performed in 1999-2006. For all of the nebulae under study, we have firmly established IR brightness and color variations on time scales shorter than one year and up to 6-8 years. The greatest IR brightness variations were observed in IC 2149, IC 4997, and NGC 7662. Their J magnitudes varied within 0.2-0.25mag. In the remaining objects, the J magnitude variations did not exceed 0.15mag. All of the planetary nebulae under study exhibited IR color variations. Based on the IR photometry, we have classified the central regions of planetary nebula NGC 1514 and of the northern part of NGC 7635 seen through a 12" aperture as B(3-7) main-sequence star (NGC 1514) and O9.5 upper-main-sequence star (NGC 7635). The nebulae IC 4997 and NGC 7027 exhibited an excess emission (with respect to the emission from a hot source) at wavelength more than 2.5micron.
- ID:
- ivo://CDS.VizieR/J/MNRAS/426/975
- Title:
- Kinematics of NGC 2768 from planetary nebulae
- Short Name:
- J/MNRAS/426/975
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- There are only a few tracers available to probe the kinematics of individual early-type galaxies beyond one effective radius. Here we directly compare a sample of planetary nebulae (PNe), globular clusters (GCs) and galaxy starlight velocities out to approximately four effective radii, in the S0 galaxy NGC 2768. Using a bulge-to-disc decomposition of a K-band image we assign PNe and starlight to either the disc or the bulge. We show that the bulge PNe and bulge starlight follow the same radial density distribution as the red subpopulation of GCs, whereas the disc PNe and disc starlight are distinct components. We find good kinematic agreement between the three tracers to several effective radii (and with stellar data in the inner regions). Further support for the distinct nature of the two galaxy components comes from our kinematic analysis. After separating the tracers into bulge and disc components we find the bulge to be a slowly rotating pressure-supported system, whereas the disc reveals a rapidly rising rotation curve with a declining velocity dispersion profile. The resulting Vrot/{sigma} ratio for the disc resembles that of a spiral galaxy and hints at an origin for NGC 2768 as a transformed late-type galaxy. A two-component kinematic analysis for a sample of S0s will help to elucidate the nature of this class of galaxy.
