- ID:
- ivo://CDS.VizieR/III/276
- Title:
- Spectral Classes in the Galaxy Anticenter
- Short Name:
- III/276
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalogue is compiled on the basis of the spectral data obtained with the 70-cm meniscus telescope of Abastumani Astrophysical Observatory using the 8{deg} objective prism (dispersion 166{AA}/mm near H{gamma}; in the short-wave region, the spectrum extends up to 3500{AA}).The field of the meniscus telescope is 4.5x4.5{deg}.The area of 140 square degrees, under study, was overlapped by nine centers. Kodak IIa-O, Kodak IIIa-J and Kodak IIIa-F plates were used. A limiting apparent magnitude in V for the stars is between 12.5 photographic mag. and 15.0 photographic mag. for M stars. The errors of our determinations are: +/-0.6 for spectral subtype and +/-0.5 for luminosity class. The catalogue contains 558 objects with peculiarities in the spectrum Ap, Am, BaII and composite spectrum stars, 86 emission stars O, B, M and objects with H{alpha}-emission as well as 453 M and 36 C-stars.Among 558 peculiar stars an overwhelming majority, namely 549, are first found. The stars in the Catalogue are arranged in the order of increasing right ascension. The stars are numbered according to zones of 1{deg} in declination. The printed catalogue is provided with suitable stellar charts reproduced from the Lick Catalogue. The reference system on the charts refers to 1950 epoch and it is plotted according to the Smithsonian Astrophysical Observatory (SAO) catalogue. Clusters NGC 2168, NGC 1969 and OLC 0436 Whose sites in the charts are denoted with the circles, are supplies with the charts reproduced from relatively large-scale plates taken on the meniscus telescope.
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- ID:
- ivo://CDS.VizieR/J/AJ/160/52
- Title:
- Spectral classification for 631 {rho}Puppis stars
- Short Name:
- J/AJ/160/52
- Date:
- 09 Mar 2022
- Publisher:
- CDS
- Description:
- The {rho}Puppis stars are mid-F-type stars that show peculiar chemical-abundance patterns similar to those of the Am stars. Typically they exhibit overabundances of iron-peak elements such as Fe and Ni and s- and r-process elements such as Sr and Eu, and underabundances of certain other elements including He, Ca, and Sc. It has been proposed that these stars are evolving Am stars passing through the short-lived phase that occurs between the re-establishment of convection and the consequent erasure of their chemical peculiarities. In this paper we suggest a second hypothesis: these stars may have acquired their peculiar abundance patterns in a fashion similar to the Barium stars, i.e., they may have gained the s-process element enhancements via mass transfer from a once asymptotic giant-branch companion star, now turned white dwarf. This study will detail our efforts to investigate the {rho}Puppis stars with regard to these two hypotheses, with a view to understanding these stars and their significance in terms of stellar evolution. We have performed a spectral classification survey, and a detailed chemical-abundance analysis of selected {rho}Puppis stars. This paper gives an overview of the {rho}Puppis stars and describes the spectral classification survey which has increased the number of {rho}Puppis stars currently known from 6 to 49. A future paper will describe the chemical-abundance analysis which should provide insight into the nature of these stars.
- ID:
- ivo://CDS.VizieR/J/AJ/152/31
- Title:
- Spectral classification of O Vz stars from GOSSS
- Short Name:
- J/AJ/152/31
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- On the basis of the Galactic O Star Spectroscopic Survey (GOSSS), we present a detailed systematic investigation of the O Vz stars. The currently used spectral classification criteria are rediscussed, and the Vz phenomenon is recalibrated through the addition of a quantitative criterion based on the equivalent widths of the HeI{lambda}4471, HeII{lambda}4542, and HeII{lambda}4686 spectral lines. The GOSSS O Vz and O V populations resulting from the newly adopted spectral classification criteria are comparatively analyzed. The locations of the O Vz stars are probed, showing a concentration of the most extreme cases toward the youngest star-forming regions. The occurrence of the Vz spectral peculiarity in a solar-metallicity environment, as predicted by the FASTWIND code, is also investigated, confirming the importance of taking into account several processes for the correct interpretation of the phenomenon.
- ID:
- ivo://CDS.VizieR/J/ApJ/699/150
- Title:
- Spectral classifications of Massive YSOs in LMC
- Short Name:
- J/ApJ/699/150
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present and categorize Spitzer infrared spectrometer spectra of 294 objects in the Large Magellanic Cloud (LMC) to create the largest and most complete catalog of massive young stellar object (YSO) spectra in the LMC. Target sources were identified from infrared photometry and multiwavelength images indicative of young, massive stars highly enshrouded in their natal gas and dust clouds. Several objects have been spectroscopically identified as non-YSOs and have features similar to more-evolved stars such as red supergiants, asymptotic giant branch (AGB), and post-AGB stars. Our sample primarily consists of 277 objects we identify as having spectral features indicative of embedded YSOs. The remaining sources are comprised of seven C-rich evolved sources, eight sources dominated by broad silicate emission, and one source with multiple broad emission features.
- ID:
- ivo://CDS.VizieR/III/119
- Title:
- Spectral classifications of proper motion stars
- Short Name:
- III/119
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue lists the spectral classifications of over 3200 stars, mainly of large proper motion, observed and classified by the late Dr. G.P. Kuiper during the years 1937-1944 at the Yerkes and McDonald Observatories. While Kuiper himself published many of his types, and while improved classifications are now available for many of these stars, much of value remains: for a great many of the objects no other spectral data exist.
- ID:
- ivo://CDS.VizieR/J/A+AS/133/201
- Title:
- Spectral class of unidentified IRAS sources
- Short Name:
- J/A+AS/133/201
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- M spectral types and IRAS infrared magnitudes, colors, and variability parameters are given for 155 largely unidentified IRAS point sources having quality-3 flux densities at 12, 25, and 60 mum.
- ID:
- ivo://CDS.VizieR/J/MNRAS/473/4436
- Title:
- Spectral properties of 441 radio pulsars
- Short Name:
- J/MNRAS/473/4436
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a study of the spectral properties of 441 pulsars observed with the Parkes radio telescope near the centre frequencies of 728, 1382 and 3100MHz. The observations at 728 and 3100MHz were conducted simultaneously using the dual-band 10-50cm receiver. These high-sensitivity, multifrequency observations provide a systematic and uniform sample of pulsar flux densities. We combine our measurements with spectral data from the literature in order to derive the spectral properties of these pulsars. Using techniques from robust regression and information theory, we classify the observed spectra in an objective, robust and unbiased way into five morphological classes: simple or broken power law, power law with either low- or high-frequency cut-off and log-parabolic spectrum. While about 79 per cent of the pulsars that could be classified have simple power-law spectra, we find significant deviations in 73 pulsars, 35 of which have curved spectra, 25 with a spectral break and 10 with a low-frequency turn-over. We identify 11 gigahertz-peaked spectrum (GPS) pulsars, with 3 newly identified in this work and 8 confirmations of known GPS pulsars; 3 others show tentative evidence of GPS, but require further low-frequency measurements to support this classification. The weighted mean spectral index of all pulsars with simple power-law spectra is -1.60+/-0.03. The observed spectral indices are well described by a shifted log-normal distribution. The strongest correlations of spectral index are with spin-down luminosity, magnetic field at the light-cylinder and spin-down rate. We also investigate the physical origin of the observed spectral features and determine emission altitudes for three pulsars.
- ID:
- ivo://CDS.VizieR/III/40A
- Title:
- Spectral Survey of Southern Milky Way
- Short Name:
- III/40A
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The spectral survey, carried out at the Stockholm Observatory, was initiated by B. Lindblad. The observational material was obtained by L.O. Loden, K. Loden and others in the years 1956-1965, when the Stockholm Observatory took part in a joint enterprise for using the Harvard-Boyden station. The Swedish Natural Science Research Council, the Royal Academy of the Sciences, and the K. and A. Wallenberg Foundation funded the observations, which are based on both direct and objective prism plates. The data were published in three parts, the first having less precise positions than the others. The coordinates for Catalogue I (3033) were later recomputed with the same reduction procedure as Catalogues II (3034) and III (3035), making the present catalogue uniform (Andersen, 1977). The files include star identification, finding chart identification, RA and Dec, galactic longitude and latitude, spectral type, blue magnitude, visual magnitude and remarks. The data concerning the part 2 were revised by Brian Skiff in November 1996 (see the "History" section below)
- ID:
- ivo://CDS.VizieR/III/267
- Title:
- Spectral types from Uppsala Observatory
- Short Name:
- III/267
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The two papers compiled here contain spectral types for about 2600 stars in two regions near +20 deg and +40 deg galactic latitude at far-northern Declination. The +20 deg latitude region extends from about RA 19h30m to 0h00m; the +40 deg latitude region extends from about RA 10h to 15h45m. Each zone is about 5 deg in width and the faintest stars are about V mag 11. This includes nearly all BD stars plus many fainter ones. A statistical study of these stars was presented in a third paper (1954ArA.....1..483S). The source material consists of objective-prism plates taken between 1934 and 1940 with the Zeiss-Heyde astrograph (15cm aperture f/10 triplet) of the Uppsala Observatory. The 9.7-deg prism gave a dispersion of 1.4mm between H-gamma and H-epsilon, roughly 260A/mm. The stars were classified on the basis of microphotometer tracings of the spectra. For the present list only the spectral types have been preserved, and various magnitudes, line-ratios, and color-equivalents omitted. The coordinates are mainly from Tycho-2. The magnitudes close to standard V are from modern sources including Tycho-2 and the TASS MkIV survey. The Uppsala spectral types are expressed in MK notation, specifically relating to dwarf/giant discrimination via the CN bands for G and K stars, and some luminosity classification via Balmer line-widths for stars between late-B and early-A. In principle, the temperature types are matched to the HD scale. A few "new" metallic-line A-type stars are reported here as well. In addition, two mag 10 stars were identified by Schalen as type 'B'. Examination of Burrell Schmidt objective-prism plates (uv-transparent 10-degree prism, 110A/mm) shows that both are previously unrecognized B subdwarfs (BD+74 435 and BD+77 564 in the latitude +40 zone). The catalogue contains many stars not classified, for instance, in the HD or for the Yale and AGK astrometric catalogues. Similarly, large numbers of BD stars without accurate coordinates are identified here for the first time. Non-BD stars are assigned the acronyms [S48] and [S49]. There are several clerical errors in the published tables such that stars are either not the named BD star or are not recovered near the nominal coordinates. A combination of the spectral types and more recent photometric colors was used to identify candidates within about 10' radius, but a few stars remain lost.
- ID:
- ivo://CDS.VizieR/J/AJ/146/85
- Title:
- Spectral types of 1576 optical stars in ONC
- Short Name:
- J/AJ/146/85
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report new spectral types or spectral classification constraints for over 600 stars in the Orion Nebula Cluster (ONC) based on medium resolution (R{approx}1500-2000) red optical spectra acquired using the Palomar 200" and Kitt Peak 3.5m telescopes. Spectral types were initially estimated for F, G, and early K stars from atomic line indices while for late K and M stars, which constitute the majority of our sample, indices involving TiO and VO bands were used. To ensure proper classification, particularly for reddened, veiled, or nebula-contaminated stars, all spectra were then visually examined for type verification or refinement. We provide an updated spectral type table that supersedes previous work, increasing the percentage of optically visible ONC stars with spectral type information from 68% to 90%. However, for many objects, repeated observations have failed to yield spectral types primarily due to the challenges of adequate sky subtraction against a bright and spatially variable nebular background. The scatter between our new and our previously determined spectral types is approximately two spectral sub-classes. We also compare our grating spectroscopy results with classification based on narrow-band TiO filter photometry, finding similar scatter. While the challenges of working in the ONC may explain much of the spread, we highlight several stars showing significant and unexplained bona fide spectral variations in observations taken several years apart; these and similar cases could be due to a combination of accretion and extinction changes. Finally, nearly 20% of ONC stars exhibit obvious CaII triplet emission indicative of strong accretion.
