Fluorine in R Coronae Borealis Stars (2008)
Pandey, G, Lambert, D. L, Kameswara Rao, N
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Fluorine in R Coronae Borealis and Extreme Helium Stars (2007)
Pandey, G, Lambert, D. L, Kameswara Rao, N
Neutral fluorine lines are identified in the optical spectra of several R Coronae Borealis stars (RCBs) at maximum light. These lines provide the first measurement of the fluorine abundance in these...
Abundance analysis of the cool extreme helium star LSS3378 (2006)
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An Analysis of Ultraviolet Spectra of Extreme Helium Stars and New Clues to Their Origins (2006)
Pandey, G, Lambert, D. L, Simon, C. S, Rao, N. K
Abundances of about 18 elements including the heavy elements Y and Zr are determined from Hubble Space Telescope Space Telescope Imaging Spectrograph ultraviolet spectra of seven extreme helium stars...
Abundance analyses of cool extreme helium stars (2001)
Pandey, G, Kameswara Rao, N, Lambert, D L, Jeffery, C. S, Asplund, M
Extreme helium stars (EHes) with effective temperatures from 8000 to 13000K are among the coolest EHes and overlap the hotter R CrB stars in effective temperature. The cool EHes may represent an...
Lambert, D. L, Kameswara Rao, N, Pandey, G, Ivans, I. I
Infrared Space Observatory 3-25 μm spectra of the R Coronae Borealis stars V854 Cen, R CrB, and RY Sgr are presented and discussed. Sharp emission features coincident in wavelength with the...
Chemical Compositions of Four Metal-poor Giant Stars (2001)
Giridhar, S, Lambert, D. L, Gonzalez, G, Pandey, G
We present the chemical compositions of four K giants (CS 22877-1, CS 22166-16, CS 22169-35, and BS 16085-0050) that have [Fe/H] in the range -2.4 to -3.1. Metal-poor stars with [Fe/H]
Variability in the extreme helium star LSS 5121 (2001)
Woolf, V. M., Cuadrado, R. Aznar, Pandey, G., Jeffery, C. Simon
We report a photometric and spectroscopic study of the hot extreme helium star LSS 5121. We found photometric variability, but no period was evident in its periodogram. This is consistent with the...
Early time optical spectroscopy of supernova SN 1998S (2001)
Anupama, G. C, Sivarani, T, Pandey, G
We present medium-resolution optical spectra of the type II supernova SN 1998S obtained during the pre-maximum, maximum and early decline phases. The early decline spectra show complex Balmer line...
Abundance analysis of extreme helium stars (2000)
Pandey, G, Rao, N. K, Lambert, D. L, Jeffery, C. S, Asplund, M
High resolution spectra were obtained for a sample of hydrogen-deficient stars which are hotter than the R CrB stars and cooler among the extreme helium stars (EHe). We believe that these stars are...
The 1995-96 decline of R Coronae Borealis: high-resolution optical spectroscopy (1999)
Kameswara Rao, N, Lambert, D. L, Adams, M. T, Doss, D. R, Gonzalez, G, Hatzes, A. P, ...
A set of high-resolution optical spectra of R CrB acquired before, during and after its 1995-96 decline is discussed. All of the components reported from earlier declines are seen. This novel data...
Pandey, G., Boué, C., Fournier, D., Boccara, A.
Colinear mirage detection was found to be simple and efficient to solve the problem of thermal diffusivity measurements in transparent polymer foils. Both reliable values have been obtained and...
Thermal diffusivity measurement by I.R. microscopy : application to opaque polymeric samples (1994)
Guitonny, J., Pandey, G., Boccara, A., Fournier, D.
In this paper, we have used an IR imaging system coupled with an IR detector to explore the periodically heated field in order to measure thermal diffusivity. Results on low diffusivity materials...
Pandey, G., Boué, C., Fournier, D., Boccara, A.
Colinear mirage detection was found to be simple and efficient to solve the problem of thermal diffusivity measurements in transparent polymer foils. Both reliable values have been obtained and...
Thermal diffusivity measurement by I.R. microscopy : application to opaque polymeric samples (1994)
Guitonny, J., Pandey, G., Boccara, A., Fournier, D.
In this paper, we have used an IR imaging system coupled with an IR detector to explore the periodically heated field in order to measure thermal diffusivity. Results on low diffusivity materials...
Pandey, G., Boué, C., Fournier, D., Boccara, A.
Colinear mirage detection was found to be simple and efficient to solve the problem of thermal diffusivity measurements in transparent polymer foils. Both reliable values have been obtained and...
Thermal diffusivity measurement by I.R. microscopy : application to opaque polymeric samples (1994)
Guitonny, J., Pandey, G., Boccara, A., Fournier, D.
In this paper, we have used an IR imaging system coupled with an IR detector to explore the periodically heated field in order to measure thermal diffusivity. Results on low diffusivity materials...
DETERMINATION OF PHOTO ACOUSTIC SPECTRA OF DYES-I CONGO RED (1983)
Photo acoustic (PA) spectra of one of the optically opaque material dye Congo-Red has been reported. The PA spectra of solid dye have been compared with the transmission spectrum of the diluate...
PHOTO ACOUSTIC SPECTROSCOPY IN THE STUDY OF METAL TOXICITY (1983)
The results on the preliminary work on Metaltoxicity by photo accoustic spectroscopy have been presented in the present paper.
DETERMINATION OF PHOTO ACOUSTIC SPECTRA OF DYES-I CONGO RED (1983)
Photo acoustic (PA) spectra of one of the optically opaque material dye Congo-Red has been reported. The PA spectra of solid dye have been compared with the transmission spectrum of the diluate...
PHOTO ACOUSTIC SPECTROSCOPY IN THE STUDY OF METAL TOXICITY (1983)
The results on the preliminary work on Metaltoxicity by photo accoustic spectroscopy have been presented in the present paper.
DETERMINATION OF PHOTO ACOUSTIC SPECTRA OF DYES-I CONGO RED (1983)
Photo acoustic (PA) spectra of one of the optically opaque material dye Congo-Red has been reported. The PA spectra of solid dye have been compared with the transmission spectrum of the diluate...
PHOTO ACOUSTIC SPECTROSCOPY IN THE STUDY OF METAL TOXICITY (1983)
The results on the preliminary work on Metaltoxicity by photo accoustic spectroscopy have been presented in the present paper.