- ID:
- ivo://CDS.VizieR/III/201
- Title:
- Pulkovo Spectrophotometric Catalog
- Short Name:
- III/201
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A spectrophotometric catalog is presented, combining results of numerous observations by Pulkovo astronomers at different observing sites. The catalog consists of three parts: the first contains the data of 602 stars in the spectral range 320-735 nm with a resolution 5 nm; the second one contains 285 stars in the spectral range of 500-1080 nm with resolution10 nm and the third one contains 278 stars combined from the preceding catalogs in spectral range 320-1080 nm with resolution 10 nm. The data are presented in the absolute energy units W/mm, with step of 2.5 nm and with an accuracy no more than 1.5 - 2.0%.
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- ID:
- ivo://CDS.VizieR/J/A+A/325/693
- Title:
- Quantitative spectral classification
- Short Name:
- J/A+A/325/693
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- New criteria of quantitative spectral classification have been introduced and the method of stepwise linear regression to these criteria for quantitative spectral classification of F-K stars has been applied to the Bochum photoelectric spectra (resolution 10A). Table 4 contains the averaged values of the classification criteria (indices) for 54 stars used in our analysis. Each measurement in our analysis refers to an area confined by the border wavelengths for an interval, the spectral energy distribution and the zero level. We chose the intervals for measurements in a such way that the sensitivity to spectral and/or luminosity effects were different for two adjacent or near-by intervals. The ratios of measurements in such intervals may then serve as classification criteria (indices) with minimum contamination by interstellar extinction. Table 2 contains the border wavelengths for the intervals with indications of the principal measured features. Table 3 contains the list of classification indices. Table 2. The border wavelengths for the intervals in Angstroems.
- ID:
- ivo://CDS.VizieR/J/A+A/624/A4
- Title:
- R CrA SPHERE and SINFONI images
- Short Name:
- J/A+A/624/A4
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- R Coronae Australis (R CrA) is the brightest star of the Coronet nebula of the Corona Australis (CrA) star forming region. It has very red colors, probably due to dust absorption and it is strongly variable. High contrast instruments allow for an unprecedented direct exploration of the immediate circumstellar environment of this star. We observed R CrA with the near-IR channels (IFS and IRDIS) of SPHERE at VLT. In this paper, we used four different epochs, three of them from open time observations while one is from the SPHERE guaranteed time. The data were reduced using the DRH pipeline and the SPHERE Data Center. On the reduced data we implemented custom IDL routines with the aim to subtract the speckle halo.We have also obtained pupil-tracking H-band (1.45-1.85um) observations with the VLT/SINFONI near-infrared medium-resolution (R3000) spectrograph. A companion was found at a separation of 0.156" from the star in the first epoch and increasing to 0.184" in the final one. Furthermore, several extended structures were found around the star, the most noteworthy of which is a very bright jet-like structure North-East from the star. The astrometric measurements of the companion in the four epochs confirm that it is gravitationally bound to the star. The SPHERE photometry and the SINFONI spectrum, once corrected for extinction, point toward an early M spectral type object with a mass between 0.3 and 0.55M_{sun}_. The astrometric analysis provides constraints on the orbit paramenters: e~0.4, semi-major axis at 27-28au, inclination of ~70{deg} and a period larger than 30 years. We were also able to put constraints of few MJup on the mass of possible other companions down to separations of few tens of au.
- ID:
- ivo://CDS.VizieR/J/ApJ/703/420
- Title:
- Red supergiants in M31
- Short Name:
- J/ApJ/703/420
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Red supergiants (RSGs) are a short-lived stage in the evolution of moderately massive stars (10-25M_{sun}_), and as such their location in the H-R diagram provides an exacting test of stellar evolutionary models. Since massive star evolution is strongly affected by the amount of mass loss a star suffers, and since the mass-loss rates depend upon metallicity, it is highly desirable to study the physical properties of these stars in galaxies of various metallicities. Here we identify a sample of RSGs in M31, the most metal-rich of the Local Group galaxies. We determine the physical properties of these stars using both moderate resolution spectroscopy and broadband V-K photometry. We find that on average the RSGs of our sample are variable in V by 0.5mag, smaller but comparable to the 0.9mag found for Magellanic Cloud (MC) RSGs. No such variability is seen at K, also in accord with what we know of Galactic and MC RSGs.
- ID:
- ivo://CDS.VizieR/J/A+AS/130/285
- Title:
- Sample of starburst nucleus galaxies
- Short Name:
- J/A+AS/130/285
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper presents optical long-slit spectroscopic observations of 105 barred Markarian IRAS galaxies. These observations are used to determine the spectral type (starburst or Seyfert) of emission-line regions in the nucleus and along the bar of the galaxies, in order to define a homogeneous sample of Starburst Nucleus Galaxies (SBNGs). Our selection criteria (ultraviolet excess, far infrared emission and barred morphology) have been very efficient for selecting star-forming galaxies, since our sample of 221 emission-line regions includes 82% nuclear or extranuclear starbursts. The contamination by Seyferts is low (9%). The remaining galaxies (9%) are objects with ambiguous classification (HII or LINER). The dust content and H{alpha} luminosity increase towards the nuclei of the galaxies. No significant variation of the electron density is found between nuclear and bar HII regions. However, the mean H{alpha} luminosity and electron density in the bar are higher than in typical disk HII regions. We investigate different mechanisms for explaining the excess of nitrogen emission observed in our starburst nuclei. There is no evidence for the presence of a weak hidden active galactic nucleus in our starburst galaxies. The cause of this excess is probably a selective enrichment of nitrogen in the nuclei of the galaxies, following a succession of short and intense bursts of star formation. Our sample of SBNGs, located at a mean redshift of 0.015, has moderate H{alpha} (10^41^erg/s) and far infrared (10^10^L{sun}) luminosities. The types are distributed equally among early- and late-type giant spirals with a slight preference for Sbc/Sc types because of their barred morphology. The majority (62%) of SBNGs are isolated with no sign of gravitational interaction. In terms of distance, luminosity and level of interaction, SBNGs are intermediate between HII galaxies and luminous infrared galaxies.
- ID:
- ivo://CDS.VizieR/II/47
- Title:
- Scanner Abundance in late-type evolved stars
- Short Name:
- II/47
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Abundance parameters have been derived from scanner observations of 229 stars. Observations were made with the Wampler photoelectric spectrum scanner (Wampler, 1966) on Lick Observatory's Crossley and 120inch telescopes. Data reductions were performed at UC Berkeley on the IBM 7094 computer using programs by L.V. Kuhi and B.J. Taylor. The method of reduction and the photometric standard system are described by Spinrad and Taylor (1969AJ.....72..320S). The file "color.dat" (tables 5 and 6 in the publication) gives colors between 3880 and 7400{AA} for program stars and survey stars, normalized so that I(5360)=1000. The file "block.dat" gives the blocking fractions for program stars.
- ID:
- ivo://CDS.VizieR/J/A+A/646/A165
- Title:
- SDSS J1339+1310 light curves and spectra
- Short Name:
- J/A+A/646/A165
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We studied the accretion disc structure in the doubly imaged lensed quasar SDSS J1339+1310 using r-band light curves and UV-visible to near-IR spectra from the first 11 observational seasons after its discovery. The 2009-2019 light curves displayed pronounced microlensing variations on different timescales, and this microlensing signal permitted us to constrain the half-light radius of the 1930{AA} continuum-emitting region. Assuming an accretion disc with an axis inclined at 60{deg} to the line of sight, we obtained log(r_1/2_/cm)=15.4_-0.4+^+0.93%. We also estimated the central black hole mass from spectroscopic data. The width of the CIV, MgII, and H{beta} emission lines, and the continuum luminosity at 1350, 3000, and 5100{AA}, led to log(M_BH_/M_{sun}_)=8.6+/-0.4. Thus, hot gas responsible for the 1930{AA} continuum emission is likely orbiting a 4.0x10^8^M_{sun}_ black hole at an r_1/2_ of only a few tens of Schwarzschild radii.
- ID:
- ivo://CDS.VizieR/J/A+AS/92/1
- Title:
- Secondary Spectrophotometric standards
- Short Name:
- J/A+AS/92/1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Energy distribution data on 238 secondary standard stars in the range 3200-7600{AA} with a 50{AA} step are presented. These stars are common to the Catalogue of the Sternbergh State Astronomical Institute and to the Fessenkov Astrophysical Institute (Alma-Ata). For these stars, the differences between the two catalogues do not exceed 5%, and the mean internal accuracy of both catalogue data in this wavelength range are about 3.5%. For 99 stars, the energy distribution in the near infra-red (6000-10800{AA}) are also presented.
- ID:
- ivo://CDS.VizieR/J/ApJ/762/46
- Title:
- SHARDS: GOODS-N spectrophotometry survey
- Short Name:
- J/ApJ/762/46
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the Survey for High-z Absorption Red and Dead Sources (SHARDS), an ESO/GTC Large Program carried out using the OSIRIS instrument on the 10.4m Gran Telescopio Canarias (GTC). SHARDS is an ultra-deep optical spectro-photometric survey of the GOODS-N field covering 130arcmin2 at wavelengths between 500 and 950nm with 24 contiguous medium-band filters (providing a spectral resolution R~50). The data reach an AB magnitude of 26.5 (at least at a 3{sigma} level) with sub-arcsec seeing in all bands. SHARDS' main goal is to obtain accurate physical properties of intermediate- and high-z galaxies using well-sampled optical spectral energy distributions (SEDs) with sufficient spectral resolution to measure absorption and emission features, whose analysis will provide reliable stellar population and active galactic nucleus (AGN) parameters. Among the different populations of high-z galaxies, SHARDS' principal targets are massive quiescent galaxies at z>1, whose existence is one of the major challenges facing current hierarchical models of galaxy formation. In this paper, we outline the observational strategy and include a detailed discussion of the special reduction and calibration procedures which should be applied to the GTC/OSIRIS data. An assessment of the SHARDS data quality is also performed. We present science demonstration results on the detection and study of emission-line galaxies (star-forming objects and AGNs) at z=0-5. We also analyze the SEDs for a sample of 27 quiescent massive galaxies with spectroscopic redshifts in the range 1.0<z<~1.4.
- ID:
- ivo://CDS.VizieR/III/86
- Title:
- SKYLAB S-019 Far-UV Objective-Prism Spectrophotometry
- Short Name:
- III/86
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalog contains the ultraviolet flux measurements at wavelengths of 130-420nm, obtained with an objective-prism telescope during the three manned Skylab missions (Skylab 2, 3 and 4) in 1973 and early 1974. The telescope is an f/3 Ritchey-Chretien system with a 15-cm aperture and a calcium fluoride and lithium fluoride focal-plane corrector, and a 4{deg} prism of calcium fluoride. The spectra were obtained in 188 star fields, digitized with a PDS 1010A microdensitometer, and each spectrum was scanned in a series of 30-micron strips. The final catalogue contains 494 spectra on 492 stars, with a resolution of 0.2mn at 140nm, 1.2nm at 200nm, and 5.2nm at 300nm. The data on each star include the adopted fluxes, exposure data, intermediate-band magnitudes, and cross identifications to the Henry Draper Catalogue (Cat. <III/135>).
