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L & M band infrared studies of V4332 Sagittarii - detection of the water-ice absorption band at 3.05 microns and the CO fundamental band in emission
Dipankar P. K. Banerjee, Watson P. Varricatt, Nagarhalli M. Ashok
L and M band observations of the nova-like variable V4332 Sgr are presented. Two significant results are obtained viz. the unusual detection of water ice at 3.05 microns and the fu…
A search for radioactive 26Al in the nova-like variable V4332 Sagittarii
D. P. K. Banerjee, N. M. Ashok, O. Launila +2
We have searched for the important radioactive isotope 26Al in the nova-like source V4332 Sgr. Recent results from gamma ray astronomy show that there is pervasive emission of the…
Optical studies of V4332 Sagittarii - detection of unusually strong KI and NaI lines in emission
D. P. K. Banerjee, N. M. Ashok
We present optical observations of the enigmatic nova-like variable V4332 Sgr. The importance of this object should not be understated since it is considered to be the possible pro…
Near Infrared Intraday Variability of Mrk 421
A. C. Gupta, D. P. K. Banerjee, N. M. Ashok +1
We report results from our monitoring of the BL Lac object Mrk 421 in the near-IR band. The observations, aimed at studying the intraday variability (IDV) of the object, were c…
Near IR Spectroscopic monitoring of WR 140 during the 2001 periastron passage
W. P. Varricatt, P. M. Williams, N. M. Ashok
We present new spectra of WR 140 (HD 193793) in the JHK bands with some covering the 1.083-micron He I emission line at higher resolution, observed between 2000 October and 2003 Ma…