- ID:
- ivo://CDS.VizieR/J/other/LAstr/114.54
- Title:
- New planetary nebulae candidates
- Short Name:
- J/other/LAstr/11
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- La recherche d'objets non references dans le ciel est devenue une activite courante dans le milieu amateur. Les cibles convoitees sont de differentes natures: cometes, etoiles variables, etoiles Be, nebuleuses planetaires (NP)... L'amateur dispose maintenant de nombreuses donnees professionnelles pour realiser ses recherches, mais il lui est encore possible de decouvrir un objet par ses propres moyens, avec son materiel d'observation, a partir de ses images.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/MNRAS/365/401
- Title:
- New planetary nebulae in LMC
- Short Name:
- J/MNRAS/365/401
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report our initial discovery of 73 new planetary nebulae (PNe) in the Large Magellanic Cloud (LMC) following confirmatory 2dF spectroscopy on the Anglo-Australian Telescope. Preliminary candidate sources come from a 10 per cent sub-area of our new deep, high-resolution H{alpha} map of the central 25deg^2^ of the LMC obtained with the UK Schmidt Telescope. The depth of the high-resolution map was extended to R_equiv_~22 for H{alpha} (4.5x10^-17^erg/cm^2^/s/{AA}) by a process of multi-exposure median co-addition of a dozen 2-h H{alpha} exposures. The resulting map is at least 1-mag deeper than the best wide-field narrow-band LMC images currently available. This depth, combined with our selection technique, has also led to the discovery of extended asymptotic giant branch (AGB) haloes around many new and previously known LMC PNe for the first time. Once complete, our new survey is expected to triple the LMC PN population and have significant implications for the LMC PN luminosity function, kinematics, abundance gradients, chemical evolution and, via study of the AGB haloes, the initial to final mass relation for low- to intermediate-mass stars.
- ID:
- ivo://CDS.VizieR/J/MNRAS/394/1249
- Title:
- New PNe in 6 early-type galaxies
- Short Name:
- J/MNRAS/394/1249
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new planetary nebulae (PNe) positions, radial velocities and magnitudes for six early-type galaxies obtained with the Planetary Nebulae Spectrograph (PNS), along with derived two-dimensional velocity and velocity dispersion fields, and the {alpha} parameters (i.e. the number of PNe per unit luminosity). We also present new deep absorption-line long-slit kinematics for three galaxies in the sample, obtained with the FOcal Reducer and low dispersion Spectrograph (FORS2) at the Very Large Telescope (VLT).
- ID:
- ivo://CDS.VizieR/J/ApJ/515/610
- Title:
- New PN in southern Galactic Bulge
- Short Name:
- J/ApJ/515/610
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a deep and uniform narrowband H{alpha} imaging survey for planetary nebulae (PNs) in the southern Galactic bulge. In our survey, we have found 56 new PNs and have rediscovered 45 known PNs. We have measured the radial velocities of this uniformly selected sample and have also remeasured radial velocities for a subset of 317 PNs from the Acker catalog. Using the COBE/DIRBE 1.25, 2.2, and 3.5{mu}m images, we show that there is a similar longitude distribution of the PNs and the COBE light in the zone of our deep survey. Also, we find that the extinction in our surveyed fields is not severe and that its distribution is fairly uniform. Finally, we present H{alpha} fluxes for 47 of our 56 newly discovered PNs and estimate the survey detection limit.
- ID:
- ivo://CDS.VizieR/J/AJ/123/269
- Title:
- New SMC planetary nebulae
- Short Name:
- J/AJ/123/269
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using the ESO 2.2m telescope with the 8Kx8K mosaic CCD, we have surveyed 2.8deg^2^ (~1.6{deg}x1.7{deg}) of the Small Magellanic Cloud (SMC) to search for faint planetary nebulae (PNs); 34 PNs were previously known in this central region. We identified 25 new PNs, all faint and spectroscopically confirmed.
- ID:
- ivo://CDS.VizieR/J/A+A/600/L9
- Title:
- NGC 1514 and LoTr 5 radial velocity curves
- Short Name:
- J/A+A/600/L9
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The importance of long-period binaries on the formation and evolution of planetary nebulae is still rather poorly understood, in part due to the lack of central star systems known to comprise such long-period binaries. Here, we report on the latest results from the on-going Mercator-HERMES survey for variability in the central stars of planetary nebulae. We present a study of the central stars of NGC 1514, BD+30 623, the spectrum of which shows features associated with a hot nebular progenitor as well as a possible A-type companion. Cross-correlation of high-resolution HERMES spectra against synthetic spectra shows the system to be a highly eccentric (e~0.5), double-lined binary with a period of ~3300 days. Previous studies indicated that the cool component might be a Horizontal Branch star of mass ~0.55M_{sun}_ but the observed radial velocity amplitudes rule out such a low mass. Assuming the nebular symmetry axis and binary orbital plane are perpendicular, the data are more consistent with a post-main-sequence star ascending towards the Giant Branch. We also present the continued monitoring of the central star of LoTr 5, HD 112313, which has now completed one full cycle, allowing the orbital period (P~2700-days) and eccentricity (e~0.3) to be derived. To date, the orbital periods of BD+30 623 and HD 112313 are the longest to have been measured spectroscopically in the central stars of planetary nebulae. Furthermore, these systems, along with BD+33 2642, comprise the only spectroscopic wide-binary central stars currently known.
- ID:
- ivo://CDS.VizieR/J/A+A/620/A169
- Title:
- NGC 7009 MUSE imaging spectroscopic survey
- Short Name:
- J/A+A/620/A169
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The spatial structure of the emission lines and continuum over the 50-arcsecond extent of the nearby, O-rich, PN NGC 7009 (Saturn Nebula) have been observed with the MUSE integral field spectrograph on the ESO Very Large Telescope. This study concentrates on maps of line emission and their interpretation in terms of physical conditions. MUSE Science Verification data, in <0.6-arcsecond seeing, have been reduced and analysed as maps of emission lines and continuum over the wavelength range 4750-9350{AA}. The dust extinction, the electron densities and temperatures of various phases of the ionized gas, abundances of species from low to high ionization and some total abundances are determined using standard techniques. Emission line maps over the bright shells are presented, from neutral to the highest ionization available (HeII and [MnV]). For collisionally excited lines (CELs), maps of electron temperature (Te from [NII] and [SIII]) and density (Ne from [SII] and [ClIII]) are available and for optical recombination lines (ORLs) temperature (from the Paschen jump and ratio of HeI lines) and density (from high Paschen lines). These estimates are compared: for the first time, maps of the differences in CEL and ORL Te's have been derived, and correspondingly a map of t^2^ between a CEL and ORL temperature, showing considerable detail. Total abundances of only He and O were formed, the latter using three ionization correction factors. However the map of He/H is not flat, departing by ~2% from a constant value, with remnants corresponding to ionization structures. An integrated spectrum over an area of 2340-arcseconds squared was also formed and compared to 1D photoionization models. The spatial variation of a range of nebular parameters illustrates the complexity of the ionized media in NGC 7009. These MUSE data are very rich with detections of hundreds of lines over areas of hundreds of arcseconds squared and follow-on studies are outlined.
- ID:
- ivo://CDS.VizieR/J/ApJ/602/685
- Title:
- NGC 5128 planetary nebulae
- Short Name:
- J/ApJ/602/685
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The halos of elliptical galaxies are faint and difficult to explore, but they contain vital clues to both structure and formation. We present the results of an imaging and spectroscopic survey for planetary nebulae (PNe) in the nearby elliptical NGC 5128. We extend the work of Hui and coworkers (Cat. <J/ApJ/449/592>) well into the halo of the galaxy - out to distances of 100 and 50kpc along the major and minor axes. We now know of 1141 PNe in NGC 5128, 780 of which are confirmed. Of these 780 PNe, 349 are new from this survey, and 148 are at radii beyond 20kpc. PNe exist at distances up to 80kpc (~15r_e_), showing that the stellar halo extends to the limit of our data.
- ID:
- ivo://CDS.VizieR/J/ApJ/414/454
- Title:
- NGC 3379 planetary nebulae radial velocities
- Short Name:
- J/ApJ/414/454
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a radial velocity survey of planetary nebulae (PNs) in the normal elliptical galaxy NGC 3379 performed with the Kitt Peak 4m telescope and the NESSIE multifiber spectrograph. In two half-nights, we measured 29 PNs with projected galactocentric distances between 0.4 and 3.8 effective radii (1<R<10kpc) with an observational uncertainty of ~7km/s. These data extend 3 times further into the halo than any previous absorption-line velocity study. The velocity dispersion and photometric profile of the galaxy agrees extremely well with that expected from a constant mass-to-light ratio, isotropic orbit Jaffe model with M/L_B_~7; the best-fitting anisotropic models from a quadratic programming algorithm also give M/L_B_~7. The data are consistent with models that contain no dark matter within 3.5 effective radii of the galaxy's nucleus.
- ID:
- ivo://CDS.VizieR/J/A+A/539/A11
- Title:
- NGC 1316/1317 planetary nebula kinematics
- Short Name:
- J/A+A/539/A11
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present positions and velocities for 796 planetary nebulae (PNe) in the Fornax Brightest Cluster Galaxy NGC 1316 (Fornax A). The planetary nebulae and existing kinematics are used to explore the rotation of this merger remnant and constrain dynamical models. Using FORS2 on the VLT, the PN velocities were measured using a counter-dispersed slitless-spectroscopy technique that produced the largest-to-date sample outside of the Local Group. Spherical, non-rotating, constant-anisotropy Jeans models were con- strained by observations of the planetary nebulae and existing integrated light spectra.
