- ID:
- ivo://CDS.VizieR/J/ApJ/622/294
- Title:
- STIS UV spectra of LMC planetary nebulae
- Short Name:
- J/ApJ/622/294
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We acquired spectra of 24 LMC planetary nebulae (PNs) in the 1150-3000{AA} range in order to determine carbon and other ionic abundances. The sample more than doubles the number of LMC PNs with high-quality UV spectra in this wavelength range and whose optical images are available in the Hubble Space Telescope archive. The Space Telescope Imaging Spectrograph was used with a very large aperture to obtain virtually slitless spectra; thus, the monochromatic images in the major nebula emission lines are also available. The analysis of the data shows extremely high quality spectra. This paper presents the emission lines identified and measured and the calculation of the ionic abundances of the emitting carbon and other ions, as well as total carbon abundance.
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- ID:
- ivo://CDS.VizieR/V/84
- Title:
- Strasbourg-ESO Catalogue of Galactic Planetary Nebulae
- Short Name:
- V/84
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The electronic version of the catalogue referenced above includes 1143 true and probable planetary nebulae (Table 1 of publication); 347 objects which status is still unclear were classified among the "possible" planetary nebulae (file pospn, Table 2 of publication); and 330 objects have been rejected (file notpn, Table 3 of publication). The designation system of the planetary nebulae of this catalogue follows the recommendations of IAU Commission 5 (Astronomical Nomenclature) with the structure: PN Glll.l+bb.b where PN means "Planetary Nebula", G stands for "Galactic Coordinates", and lll.l+bb.b stand for the galactic longitude and latitude respectively, truncated to one decimal place. The designations following this system appear in the columns labelled "PNG" in the tables described below, where the "PN G" prefix has been stripped. Data concerning the 1143 true and probable planetary nebulae (part II of the publication) have been grouped in a set of related tables described below, all sorted by the "PNG" column. Note that, unlike the printed volume, only the bibliographic references corresponding to data listed in the tables are provided here, in the "refs.dat" file. Copies of the complete catalogue, including the Finding Charts (Part I) can still be ordered at the ESO Information Service, Karl-Schwarzschildstr. 2, D-85748 Garching bei Muenchen, Germany, at a price of DM 135.
- ID:
- ivo://CDS.VizieR/J/A+A/352/297
- Title:
- The dust content of planetary nebulae
- Short Name:
- J/A+A/352/297
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This table contains the dust temperatures and dust-to-gas mass ratios derived for a sample of planetary nebulae and the observational data used for these determinations
- ID:
- ivo://CDS.VizieR/J/AJ/153/140
- Title:
- The kinematics of the C II {lambda}6578 line in PNe
- Short Name:
- J/AJ/153/140
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present spectroscopic observations of the C II {lambda}6578 permitted line for 83 lines of sight in 76 planetary nebulae at high spectral resolution, most of them obtained with the Manchester Echelle Spectrograph on the 2.1 m telescope at the Observatorio Astronomico Nacional on the Sierra San Pedro Martir. We study the kinematics of the C II {lambda}6578 permitted line with respect to other permitted and collisionally excited lines. Statistically, we find that the kinematics of the C II {lambda}6578 line are not those expected if this line arises from the recombination of C^2+^ ions or the fluorescence of C^+^ ions in ionization equilibrium in a chemically homogeneous nebular plasma, but instead its kinematics are those appropriate for a volume more internal than expected. The planetary nebulae in this sample have well-defined morphology and are restricted to a limited range in H{alpha} line widths (no large values) compared to their counterparts in the Milky Way bulge; both these features could be interpreted as the result of young nebular shells, an inference that is also supported by nebular modeling. Concerning the long-standing discrepancy between chemical abundances inferred from permitted and collisionally excited emission lines in photoionized nebulae, our results imply that multiple plasma components occur commonly in planetary nebulae.
- ID:
- ivo://CDS.VizieR/J/MNRAS/482/L75
- Title:
- The short period binary CSPN of M 3-1
- Short Name:
- J/MNRAS/482/L75
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the discovery of a 3h5m orbital-period binary star at the heart of the planetary nebula M 3-1 - the shortest period photometrically variable central star known and second only to V458 Vul, in general. Combined modelling of light and radial velocity curves reveals both components to be close to Roche lobe filling, strongly indicating that the central star will rapidly evolve to become a cataclysmic variable, perhaps experiencing a similar evolution to V458 Vul resulting in a nova eruption before the planetary nebula has fully dissipated. While the short orbital period and near Roche lobe filling natures of both components make the central binary of M 3-1 an important test case with which to constrain the formation processes of cataclysmic variables, novae, and perhaps even supernovae type Ia.
- ID:
- ivo://CDS.VizieR/J/PASP/106/745
- Title:
- The Spectrum of IC 418
- Short Name:
- J/PASP/106/745
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A detailed high spectral resolution study of the spectrum of IC 418 is made for the region 3650{AA} to 10050{AA}, using the Hamilton echelle spectrograph of Lick Observatory, and of the UV spectral region with archival International Ultraviolet Explorer (IUE) data.
- ID:
- ivo://archive.stsci.edu/tues
- Title:
- Tubingen Echelle Spectrograph
- Short Name:
- TUES
- Date:
- 22 Jul 2020 21:31:05
- Publisher:
- Space Telescope Science Institute Archive
- Description:
- The Tübingen Echelle (TUES) obtained moderate dispersion observations (R=13,000) using an echelle grating including orders 40 - 61 from 910 - 1410 Angstroms. The instrument was designed and built by the University of Tübingen (PI: M. Grewing) and flew as one of three spectrographs on the ORFEUS/SPAS-2 mission for 14 days in November/December 1996. The instrumental resolution was about 10,000 and the effective aperture peaks at 1.3 cm2 near 1100 Angstroms. Objects were observed in a 10 arcsec entrance aperture. The wavelength calibration was established by means of interstellar molecular hydrogen lines.
- ID:
- ivo://CDS.VizieR/J/PAZh/32/737
- Title:
- UBV light curve and spectroscopy of StHa62
- Short Name:
- J/PAZh/32/737
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Photoelectric observations of HD 51585 (OY Gem), a B[e] star with an infrared excess and a candidate for protoplanetary nebulae, obtained with a 60-cm telescope at the Crimean Station of Sternberg Astronomical Institute in 1992-2005 are presented. The star exhibited rapid irregular brightness variations with amplitudes from 0.1mag in the V band to 0.2mag in the U band within the observing season as well as slow systematic variations. with a quasi-period of ~2800-days. Low-resolution spectroscopy performed in 1994-2005 has revealed significant variability of the Balmer and Paschen hydrogen emission lines as well as the HeI and OI lines. Equivalent widths are given for the HI, HeI, OI, and FeII lines. Correlation has been found between the star's photometric variability and the hydrogen line intensities.
- ID:
- ivo://CDS.VizieR/J/PAZh/25/30
- Title:
- UBV photometry of IRAS 18062+2410
- Short Name:
- J/PAZh/25/30
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The photometric and spectroscopic observations of IRAS 18062+2410 = V886 Her, a candidate for protoplanetary objects, in 1996-1997 are presented. The star exhibits rapid light variations with an amplitude up to 0.3mag in V. A high-resolution spectrum of IRAS shows absorption lines of H, HeI, OI, FeII, SiII, NaI and other species, including [OII], [NII], and [FeII] that belong to the stellar envelope.
- ID:
- ivo://CDS.VizieR/J/A+A/470/317
- Title:
- UV spectra of the central star of Sh 2-216
- Short Name:
- J/A+A/470/317
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We perform a comprehensive spectral analysis of LS V +46 21 in order to compare its photospheric properties to theoretical predictions from stellar evolution theory as well as from diffusion calculations. LS V +46 21 is the DAO-type central star of the planetary nebula Sh 2-216. High-resolution, high-S/N ultraviolet observations obtained with FUSE and STIS aboard the HST as well as the optical spectrum have been analyzed in order to determine the photospheric parameters and the spectroscopic distance. We performed a detailed spectral analysis of the ultraviolet and optical spectrum by means of state-of-the-art NLTE model-atmosphere techniques. From the NIV-NV, OIV-OVI, SiIV-SiV, and FeV-FeVII ionization equilibria, we determined an effective temperature of 95+/-2kK with high precision. The surface gravity is logg=6.9+/-0.2. An unexplained discrepancy appears between the spectroscopic distance d=224^+46^_-58_pc and the parallax distance d=129^+6^_-5_pc of LS V +46 21. For the first time, we have identified Mg IV and Ar VI absorption lines in the spectrum of a hydrogen-rich central star and determined the Mg and Ar abundances as well as the individual abundances of iron-group elements (Cr, Mn, Fe, Co, and Ni). With the realistic treatment of metal opacities up to the iron group in the model-atmosphere calculations, the so-called Balmer-line problem (found in models that neglect metal-line blanketing) vanishes. Spectral analysis by means of NLTE model atmospheres has presently arrived at a high level of sophistication, which is now hampered largely by the lack of reliable atomic data and accurate line-broadening tables. Strong efforts should be made to improve upon this situation.
