Browsing by Subject "Astronomical Spectroscopy"

The chemical composition of Algol systems. I - The secondary in U Cephei

Parthasarathy, M; Lambert, D. L; Tomkin, J (Royal Astronomical Society, 1979-02)

The chemical composition of the RV Tauri variable IW Carinae

Giridhar, S; Kameswara Rao, N; Lambert, D. L (The American Astronomical Society, 1994-12)

Analysis of the RV Tauri star IW Carinae shows a photospheric composition unlike that reported previously for a few other RV Tau stars but resembling that of certain post-asymptotic giant branch stars (post-AGB) stars. IW ...

Density and temperature diagnostics of solar emission lines from NA VII and AL IX

Raju, P. K; Dwivedi, B. N; Gupta, A. K (Springer, 1994-02)

Line intensity ratios of extreme ultraviolet (EUV) emission lines from Na VII and Al IX have been considered for electron density and temperature determinations within the chromosphere-corona transition region and the ...

Embedded clusters in giant extragalactic H II regions, 1: BVRH-alpha photometry

Mayya, Y. D (The American Astronomical Society, 1994-10)

Photometry in BVR continuum bands and in the emission line of H-alpha+(N II) are presented for a sample of H II complexes in disk, spiral arm and nuclear regions of galaxies NGC 1365, 1566, 2366, 2903, 2997, 3351, 4303, ...

High-resolution studies of forbidden O I and NH2 line emissions at 6300 A in Halley's comet

Prasad, C. D; Chandrasekhar, T; Desai, J. N; Ashok, N. M; Sivaraman, K. R; Rajmohan, R (Astronomical Society of the Pacific, 1988-06)

The forbidden O I line and NH2 (0-8-0) emissions of Comet Halley at about 6300 A were observed during April 1986 using a Fabry-Perot spectrometer with a resolution of about 0.14 A. The forbidden O I line and NH2 rotational ...

Optical colours and polarization of a model reflection nebula. III - Composite and mixture of grains in the nebula with the star in the rear

Shah, G. A (Indian Academy of Sciences, 1977-11)

The colour differences between the star and the associated reflection nebula and polarization caused by core mantle grains and mixture of grains have been given. They are based on homogeneous plane-parallel slab-model of ...

The predicted infrared spectrum of ZrO and its possible presence in S stars

Murty, P. S (D. Reidel Publishing Company, 1980-04)

The unidentified absorption feature at 9730 Â± 5 A observed in the spectra of pure S stars is provisionally identified with the predicted 9732 A (0, 0) band of the e `IT-c `z\ transition of ZrO molecule. Relative band ...

Quantitative astronomical spectroscopy in the post Saha equation period

Bhattacharyya, J. C (Saha Institute of Nuclear Physics, 2017-07)

Several new questions of quantitatively estimating physical conditions on astronomical bodies had opened up after formulation of Saha Ionization Equation. The article first reviews the step by step progress in ...

Radio observations of the S0 galaxy NGC 1218 (3C 78)

Saikia, D. J; Subrahmanya, C. R; Patnaik, A. R; Unger, S. W; Cornwell, T. J; Graham, D. A; Prabhu, T. P (Royal Astronomical Society, 1986-04)

The authors present VLA observations of the S0 galaxy NGC 1218 at λ20 and 6 cm with both the A and D arrays, at λ20 cm with the B array and at λ2 and 1.3 cm with the A array. They also present VLBI observations at λ6 cm ...

Spectral classification at ultra-low dispersion

Rajamohan, R (D. Reidel Publishing Co., 1984-11)

The accuracy of the ultralow-dispersion slitless-spectroscopy technique of Bappu and Parthasarathy (1977) in classifying early-type stars at great distances from the sun is investigated experimentally using a 5-min exposure ...

A spectroscopic study of the Scorpio-Centaurus association

Rajamohan, R (Indian Academy of Sciences, 1976-09)

Rotational velocities for 112 members of the Scorpio-Centaurus association brighter than 8.5 magnitudes are derived from spectra obtained with a dispersion of 47 A/mm. Hydrogen and helium line intensities are determined ...

Stellar rotation on the zero age main sequence

Rajamohan, R (Royal Astronomical Society, 1978-09)

Analysis of rotational velocities of unevolved members in clusters indicates that for a given mass the dispersion in the true rotational velocities is small for normal, single main-sequence stars. The envelope of highest ...

Browsing by Subject "Astronomical Spectroscopy"

Browsing by Subject "Astronomical Spectroscopy"

Search DSpace

Browse

All of DSpace

My Account