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Astronomy & Astrophysics Division

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.

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Astronomy & Astrophysics Division

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  1. 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

  2. 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

  3. Mt.Abu Infrared Observatory - Outside View

  4. Mt.Abu Infrared Observatory - Inside View of the 1.2 m telescope

  5. Focal Plane Instruments for 1.2m IR Telescope At Mt. Abu Infrared Observatory 2 - Channel IR Photometer Imaging Fabry-Perot Spectrometer Polarimeter CCD Camera NICMOS Imager/Spectrometer Fibre-linked Grating Spectrograph Mirror Aluminisation Aluminising Plant at Mt. Abu Observatory

  6. Infrared studies of Novae 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 2. Dwarf Novae 3. Recurrent Novae 4. Nova like variables 5. Magnetic CVs

  7. 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

  8. Infrared Spectra of V445 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)

  9. Helium lines in V445 Pup HeI line at 2.0581 microns. V445 Pup is the red object. The redness is because of dust formation after outburst.

  10. V4332 Sgr Some results Optical spectrum - unusually strong KI, NaI resonance lines AlO Bands in IR From 2003, Ap.J(L), 598, L31 2004, Ap.J(L), 604, L57 2004, Ap.J(L), 610, L29 2004, Ap.J(L), 615, L53 Ro-vibrational spectrum of CO fundamental band Water ice at 50K at 3 microns

  11. Infrared water lines in V838 Mon - A rare eruptive variable with a light echo Mt. Abu spectra from 2002-2004 and Model fits to the water lines V838 Mon erupted in 2002 and is now surrounded by a cool water shell at 800K. Detection of water lines is in general rare in celes- tial objects and have not been seen earlier in a nova-like object. 2005, ApJL, 627, L141

  12. 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 JApA, 22, 155

  13. Thanks

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