Astronomy Astrophysics Division Research Programmes IROptical Stellar Evolution

Astronomy & Astrophysics Division Research Programmes - IR/Optical Stellar Evolution IS Matter & Star Formation Milky Way Active Galaxies Comets Research Programmes - Radio Sun; Solar Wind; Comets Quasars & Pulsars

Astronomy and Astrophysics Division • Observing facility 1. 2 m Infrared Telescope at Gurushikhar, Mt. Abu • Instrumentation NICMOS Imager/ Spectrometer 2 Channel Infrared Photometer Fabry-Perot Spectrometer Optical Polarimeter Fibre Linked Grating Spectrograph CCD Camera Imager

Mt. Abu Infrared Observatory - Outside View

Mt. Abu Infrared Observatory - Inside View of the 1. 2 m telescope

Focal Plane Instruments for 1. 2 m IR Telescope At Mt. Abu Infrared Observatory 2 - Channel IR Photometer Imaging Fabry-Perot Spectrometer Fibre-linked Grating Spectrograph Polarimeter NICMOS Imager/Spectrometer Aluminising Plant at Mt. Abu Observatory CCD Camera Mirror Aluminisation

Infrared studies of Novae belong to a Class of Eruptive variable stars called Cataclysmic Variables (CVs) Cataclysmic Variables are stars that have occasional outbursts caused by thermonuclear processes or accretion induced processes. Different classes of CVs 1. Classical Novae 3. Recurrent Novae 5. Magnetic CVs 2. Dwarf Novae 4. Nova like variables

Hydrogen lines generally seen in Novae Brackett Series lines from 11 to 22 Recurrent nova RS Ophiuchi (H band) NSgr 2001 (J band) MNRAS, 2006, in press

Infrared Spectra of V 445 Puppis Near Infrared Spectra from Mt. Abu Observatory Hydrogen deficiency confirmed : Unusually rich in CI lines FIRST OBSERVED HELIUM NOVA (2003, A&A, 409, 1007)

Helium lines in V 445 Pup He. I line at 2. 0581 microns. V 445 Pup is the red object. The redness is because of dust formation after outburst.

V 4332 Sgr Some results Optical spectrum - unusually strong KI, Na. I resonance lines Al. O Bands in IR From 2003, Ap. J(L), 598, 2004, Ap. J(L), 604, 2004, Ap. J(L), 610, 2004, Ap. J(L), 615, Water ice at 50 K at 3 microns L 31 L 57 L 29 L 53 Ro-vibrational spectrum of CO fundamental band

Infrared water lines in V 838 Mon A rare eruptive variable with a light echo Mt. Abu spectra from 2002 -2004 and Model fits to the water lines V 838 Mon erupted in 2002 and is now surrounded by a cool water shell at 800 K. Detection of water lines is in general rare in celestial objects and have not been seen earlier in a nova-like object. 2005, Ap. JL, 627, L 141

Study of Starburst Galaxies Prodigious starformation rate as compared to normal galaxies Light dominated by HII regions- ionized by young stars Aim: To study the morphology and origin of starburst phenomena Optically selected sample of 19 galaxies from Markarian catalog Includes all Hubble types BVRI, Ha and near IR imaging 1999 A&AS, 139, 105 1999 A&A, 352, 112 2001 JAp. A, 22, 155