- ID:
- ivo://CDS.VizieR/J/BaltA/11/1
- Title:
- Interstellar extinction curves of OB stars
- Short Name:
- J/BaltA/11/1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The paper presents a collection of 436 extinction curves covering the whole available range of wavelengths from satellite UV to near-IR. The data were taken from the ANS photometric catalogue (Cat. <II/97>) and from the compilations of IR photometric measurements. The data curves have been obtained with the aid of "artificial standards" Papaj et al. (1993A&A...273..575P) and Wegner (1994MNRAS.270..229W, 1995, Interstellar Absorption Structures in the Direction of Nearby OB stars, Wyd. Uczelniane WSP, Bydgoszcz, p. 1-383). The visual magnitudes and spectral classifications of O and B type stars with E_B-V_>=0.05 were taken from the SIMBAD database. The curves are given in the form of plots and tables E_{lambda}-V_/E_B-V_ versus 1/{lambda}. The observed variety of extinction laws among slightly reddened stars is apparently due to the various physical parameters of interstellar clouds.
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Search Results
- ID:
- ivo://CDS.VizieR/III/148A
- Title:
- Interstellar lines catalogue
- Short Name:
- III/148A
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A bibliographical catalogue of the interstellar lines has been prepared (2003 stars in our Galaxy, 86 stars in the Magellanic Clouds and 41 extragalactic objects), and 371 bibliographical references.
- ID:
- ivo://CDS.VizieR/V/86
- Title:
- Interstellar matter in the Galactic Disk
- Short Name:
- V/86
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue, developed for a new study of the interstellar medium in the solar vicinity, contains estimations of extinction and distances from reliable UBV data and MK types; special attention was paid to the consistency between spectroscopic and photometric data. There are four sets of 2 files: the main set is named CEDDU (Catalogue of Extinctions and Distances Derived from UBV data). Appendices contain stars with discrepant results: negative colour excesses (exneg), apparently very close stars with heavy reddening (avlar), and apparently very far stars with low reddening (asmal). For each set, one file contains a selection of observational data along with derived and computed parameters, and a second file contains the complete set of observational data. Please refer to the enclosed file "intro" (plain ascii) or "intro.tex" (LaTeX) for a more detailed description of the catalogue and how it was built.
6984. Interstellar NaI D-line
- ID:
- ivo://CDS.VizieR/J/A+A/411/447
- Title:
- Interstellar NaI D-line
- Short Name:
- J/A+A/411/447
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present intermediate results from a long-term program of mapping the neutral absorption characteristics of the local interstellar medium, motivated by the availability of accurate and consistent parallaxes from the Hipparcos satellite. Equivalent widths of the interstellar NaI D-line doublet at 5890{AA} are presented for the lines-of-sight towards some 311 new target stars lying within ~350pc of the Sun. Using these data, together with NaI absorption measurements towards a further ~240 nearby targets published in the literature (for many of them, in the directions of molecular clouds), and the ~450 lines-of-sight already presented by (Sfeir et al., 1999, Cat. <J/A+A/346/785>), we show 3D absorption maps of the local distribution of neutral gas towards 1005 sight-lines with Hipparcos distances as viewed from a variety of different galactic projections. The data are synthesized by means of two complementary methods, (i) by mapping of iso-equivalent width contours, and (ii) by density distribution calculation from the inversion of column-densities, a method devised by Vergely et al. (2001A&A...366.1016V). Our present data confirms the view that the local cavity is deficient in cold and neutral interstellar gas. The closest dense and cold gas "wall", in the first quadrant, is at ~55-60pc. There are a few isolated clouds at closer distance, if the detected absorption is not produced by circumstellar material. The observations were obtained during 11 observing runs over the period 1998-2000.
- ID:
- ivo://CDS.VizieR/J/ApJS/145/355
- Title:
- Interstellar NaI lines toward anticenter
- Short Name:
- J/ApJS/145/355
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A survey of interstellar NaI D1 and D2 absorption features in the spectra of 104 early-type stars in the second and third Galactic quadrants reveals the large-scale kinematics of the interstellar gas within the Galactic anticenter hemisphere at distances from the Sun between ~70 and ~250pc. Employing a technique that uses both the radial velocities and column densities of the NaI absorptions produced by the intervening gas we have identified the velocity vectors and determined the spatial distribution of eight interstellar clouds in the volume explored.
- ID:
- ivo://CDS.VizieR/J/MNRAS/367/1478
- Title:
- Interstellar NaI, TiII & CaIIK obs.
- Short Name:
- J/MNRAS/367/1478
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present an analysis of interstellar NaI ({lambda}_air_=3302.37 and 3302.98{AA}), TiII ({lambda}_air_=3383.76{AA}) and CaIIK ({lambda}_air_=3933.66{AA}) absorption features for 74 sightlines towards O- and B-type stars in the Galactic disc. The data were obtained from the Ultraviolet and Visual Echelle Spectrograph Paranal Observatory Project (UVES POP), at a spectral resolution of 3.75km/s and with mean signal-to-noise ratios per pixel of 260, 300 and 430 for the NaI, TiII and CaII observations, respectively. Interstellar features were detected in all but one of the TiII sightlines and all of the CaII sightlines. The dependence of the column density of these three species with distance, height relative to the Galactic plane, HI column density, reddening and depletion relative to the solar abundance has been investigated. We also examine the accuracy of using the NaI column density as an indicator of that for HI. In general, we find similar strong correlations for both Ti and Ca, and weaker correlations for Na. Our results confirm the general belief that Ti and Ca occur in the same regions of the interstellar medium (ISM) and also that the TiII/CaII ratio is constant over all parameters. We hence conclude that the absorption properties of Ti and Ca are essentially constant under the general ISM conditions of the Galactic disc.
- ID:
- ivo://CDS.VizieR/J/A+A/384/1050
- Title:
- Interstellar polarization. VI.
- Short Name:
- J/A+A/384/1050
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new interstellar polarization measurements for 116 stars at high galactic latitudes. Our data show that Markkanen's cloud - the main polarization structure seen in the North Galactic Pole area (b>75{deg}) extends further towards lower latitudes. Especially, we have found a new dust formation in the area 35{deg}<l<45{deg}, 57{deg}<b<63{deg}. Interstellar polarization in this part of the sky peaks at 0.7%, which gives a lower limit to the extinction A_V_>0.23mag. Polarization vectors in this cloud are very well aligned along the direction of l=50{deg}. On the IRAS 100 micron map this dust structure shows up as a bright emission area. We discuss the new polarization map extending from circumpolar to lower latitudes and point out features which suggest that Markkanen's cloud may be a part of the dust lane in the inner edge of the local spiral or spur.
- ID:
- ivo://CDS.VizieR/J/BaltA/17/125
- Title:
- Interstellar reddening in 3 HII regions
- Short Name:
- J/BaltA/17/125
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The slope of the interstellar reddening line in the J-H vs. H-Ks diagram of the 2MASS survey in the direction of the North America and Pelican nebulae, the L 935 dust cloud and the Cyg OB2 association is determined. The MK types were either classified by C.J. Corbally or collected from the literature. The ratio E(J-H)/E(H-Ks)=2.0 is obtained by taking the average for the four groups of spectral classes: O3-B1, B2-B6, B7-B9.5 and red clump giants. The obtained ratio is among the largest values of E(J-H)/E(H-Ks) determined till now.
- ID:
- ivo://CDS.VizieR/J/A+A/410/905
- Title:
- Interstellar reddening parameter measurements
- Short Name:
- J/A+A/410/905
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new measurements of the interstellar reddening parameter R_V_=A_V_/E(B-V) towards 185 O stars, using J, H, Ks photometry from the 2MASS project. The average R_V_ from these is of 3.19+/-0.50. All objects whose R_V_ departs from this value by more than 2 sigma have been recognized. Ten objects have R_V_ higher than this value and two lower. In the Cygnus region R_V_ values follow the behaviour of the general interstellar medium, while in the Carina arm, in spite of the relatively larger distance, local cloud effects prevail. The relatively few stars of our sample whose Hipparcos parallaxes are reliable, are found to have distances systematically smaller than the distances derived by the spectroscopic parallaxes. We argue that this effect is consistent with the recently claimed discovery of grey extinction towards OB stars.
- ID:
- ivo://CDS.VizieR/J/ApJS/165/439
- Title:
- Interstellar scintillation at 2 and 8GHz
- Short Name:
- J/ApJS/165/439
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- From 1979 to 1996 the Green Bank Interferometer was used by the Naval Research Laboratory to monitor the flux density from 146 compact radio sources at frequencies near 2 and 8GHz. We filter the light curves to separate intrinsic variations on times of a year or more from more rapid interstellar scintillation (ISS) on times of 550 days. Whereas the intrinsic variation at 2GHz is similar to that at 8GHz (although diminished in amplitude), the ISS variation is much stronger at 2 than at 8GHz. We characterize the ISS variation by an rms amplitude and a timescale and examine the statistics of these parameters for the 121 sources with significant ISS at 2GHz. We model the scintillations using the NE2001 Galactic electron model assuming the sources are brightness-limited.