Ultraviolet observations in Puppis with the space telescope ‘Glazar’     

H. M. Tovmassian  R. KH. Hovhannessian  R. A. Epremian  D. Huguenin  Yu. M. Khodjayants  M. N. Krmoyan  A. L. Kashin  A. P. Alexandrov  Yu. V. Romanenko 《Astrophysics and Space Science》1992,188(2):217-231

The results of observations of 159 stars at 1640 Å in Puppis made with the space telescope Glazar are presented. It is shown that the observed stars are members of different groups of stars situated at distances of about 120, 370, 700, 1250, 2400, and 4000 pc. The last two groups belong to the Pup OB1 and the Pup OB2 stellar associations.There is relatively little absorption in the observed region. The absorbing matter is mainly concentrated in small clouds.It is suggested that three stars — CP –27°4197, HD 60479, and HD 61672-are embedded in a dust envelope and that the star HD 60057 has a hot subdwarf companion.Forty-four of the observed stars are new OB or early A-type stars, spectral types of which were not known.  相似文献   

Variations in the total column amounts of carbon monoxide and methane in the Antarctic atmosphere     

F. V. Kashin  V. F. Radionov  E. I. Grechko 《Izvestiya Atmospheric and Oceanic Physics》2007,43(4):490-496

The results of measuring the total contents of carbon monoxide and methane via the method of solar-absorption spectroscopy are presented. The measurements were performed at the Molodezhnaya Station in 1977–1978, at the Mirny Observatory from 1982 to 1992, and at the Novolazarevskaya Station from 2003 to 2006. The character of seasonal variations in the contents of these gases in the Antarctic atmosphere is described and compared to the intra-annual variation of their surface concentrations measured at the Syowa Station (Japan). Synchronous intra-annual variations in the contents of carbon monoxide in the atmospheric column and in its surface concentrations are observed, while the spring maximum content of methane is observed three months after the maximum of its surface concentration. Synchronous seasonal variations in the total content of methane and ozone are observed, which makes it possible to suggest that the Antarctic circumpolar vortex has a significant influence on the characteristics of the vertical distribution of methane during Antarctic spring. Quantitative estimates of the parameters of multiyear variations in the contents of CO and CH₄ are given. The content of methane was increasing (although with different rates) during the entire observation period 1977–2006. The content of CO was observed to increase until 1992 and to decrease during 2003–2006.  相似文献   

Variations in nitrogen dioxide in the atmosphere over central Eurasia (Issyk Kul Monitoring Station)     

V. N. Aref’ev  F. V. Kashin  V. K. Semenov  V. P. Sinyakov 《Izvestiya Atmospheric and Oceanic Physics》2009,45(5):575-582

The results of an analysis of data on the total content of nitrogen dioxide in a vertical atmospheric column are given. These data have been obtained from measurements with the twilight method over a period of 25 years. The monthly and annual means (the arithmetic means of both morning and evening values) of NO₂, on the whole, have increased by ～6% in spite of its rapid decrease in 1991–1995 due to the Pinatubo eruption. The linear-trend index amounts to 0.23% per year. The annual mean over the entire observation time is equal to (3.18 ± 0.05) × 10¹⁵ mol/cm², and the amplitude of seasonal variations amounts to (2.39 ± 0.04) × 10¹⁵ mol/cm². Spectral analysis of the experimental data has revealed compound oscillations with periods of 6 to 253 months, the values of which do not contradict published data. Most of these oscillations are nonharmonic. A simple statistical model satisfactorily describes time variations in the monthly and annual means of NO₂ with rms deviations of ～4% and 1%, respectively.  相似文献