naa a22 4500 510790364 CHVBK 20180411083317.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1134/S1063773713070025 doi (NATIONALLICENCE)springer-10.1134/S1063773713070025 Gontcharov G. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, 196140, St. Petersburg, Russia aut Some properties of dust outside the galactic disk [Elektronische Daten] [G. Gontcharov] The joint use of accurate near- and mid-infrared photometry from the 2MASS and WISE catalogues has allowed the variations of the extinction law and the dust grain size distribution in high Galactic latitudes (|b| > 50°) at distances up to 3 kpc from the Galactic midplane to be analyzed. The modified method of extrapolation of the extinction law applied to clump giants has turned out to be efficient for separating the spatial variations of the sample composition, metallicity, reddening, and properties of the medium. The detected spatial variations of the coefficientsE(H − W1)/E(H − Ks), E(H − W2)/E(H − Ks), and E(H − W3)/E(H − Ks) are similar for all high latitudes and depend only on the distance from the Galactic midplane. The ratio of short-wavelength extinction to long-wavelength one everywhere outside the Galactic disk has been found to be smaller than that in the disk and, accordingly, the mean dust grain size is larger, while the grain size distribution in the range 0.5-11 µm is shifted toward coarse dust. Specifically, the mean grain size initially increases sharply with distance from the Galactic midplane, then decreases gradually, approaching a value typical of the disk at |Z| ≈ 2.4 kpc, and, further out, stabilizes or may increase again. The coefficients under consideration change with coordinate Z with a period of about 1312 ± 40 pc, coinciding every 656 ± 20 pc to the south and the north and showing a significant anticorrelation between their values in the southern and northern hemispheres at intermediate Z. Thus, there exists a unified large-scale periodic structure of the interstellar medium at high latitudes within at least 5 kpc. The same periodic variations have also been found for the extinction coefficient R V within 600 pc of the Galactic midplane through the reduction of different photometric data for stars of different classes. Pleiades Publishing, Ltd., 2013 interstellar dust grains nationallicence color-magnitude diagram nationallicence giant and subgiant stars nationallicence Astronomy Letters Springer US; http://www.springer-ny.com 39/8(2013-08-01), 550-560 1063-7737 39:8<550 2013 39 11443 https://doi.org/10.1134/S1063773713070025 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063773713070025 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Gontcharov G. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, 196140, St. Petersburg, Russia aut NATIONALLICENCE 773 0- Astronomy Letters Springer US; http://www.springer-ny.com 39/8(2013-08-01), 550-560 1063-7737 39:8<550 2013 39 11443 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer