Browsing by Subject "Spectral bands"

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Density and temperature diagnostics of solar emission lines from NE VI and MG VI

Raju, P. K; Gupta, A. K (Kluwer Academic Publishers, 1993-06)

Line intensity ratios of Ne VI lines with respect to a resonance line of Mg VI have been considered for electron density and temperature determinations within the chromosphere-corona transition region. The electron pressure ...
Long-term polarimetric behaviour of the carbon Mira R Leporis

Raveendran, A. V; Kameswara Rao, N (European Southern Observatory, 1989-05)

BVRI polarimetry of R Lep obtained during 1984-1987 shows large changes in the normalized wavelength dependence of polarization. It is found that both the amount and position angle of polarization had components which ...
Simultaneous imaging in optical and near-IR bands

Vadher, N. M; Shah, A. B; Shroff, A. J; Joshi, U. C (Astronomical Society of India, 2000)

It is very important to have simultaneous observations in optical and near IR bands to understand several astrophysical phenomena. One problem is to know the nature of the central engine in blazars, which are in general ...
X-ray spectrum of NGC 3783 - Detection of soft excess and an emission line

Ghosh, K. K; Soundararajaperumal, S; Kalai Selvi, M; Sivarani, T (EDP Sciences, 1992-02)

Results of the X-ray (0.1-10 keV) spectral analysis of the Seyfert I galaxy, NGC 3783, which was observed with EXOSAT on three epochs between 1983 and 1985, are presented here. No low energy absorption, intrinsic to the ...

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