astronomy & astrophysics division research programmes - ir/optical is matter & star...
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Astronomy & Astrophysics Division
Research Programmes - IR/OpticalResearch Programmes - IR/Optical
IS Matter & Star
Formation
Active
Galaxies
Sun; Solar Wind; Comets
Quasars & Pulsars
Research Programmes - RadioResearch Programmes - Radio
Comets
Stellar Evolution
Milky Way
• 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
Astronomy and Astrophysics Division
Fibre-linked Grating Spectrograph
Imaging Fabry-Perot Spectrometer
NICMOS Imager/Spectrometer
2 - Channel IR Photometer Polarimeter
Aluminising Plant at Mt. Abu Observatory
CCD Camera
Focal Plane Instruments for 1.2m IR TelescopeAt Mt. Abu Infrared Observatory
Mirror Aluminisation
Infrared studies of Novae
Novae belong to a Class of Eruptive variable stars called Cataclysmic Variables (CVs)
Cataclysmic Variables are stars that have occasionaloutbursts caused by thermonuclear processes or accretion induced processes.
Different classes of CVs1. Classical Novae 2. Dwarf Novae 3. Recurrent Novae 4. Nova like variables5. Magnetic CVs
Brackett Series lines from 11 to 22
Hydrogen lines generally seen in Novae
Recurrent nova RS Ophiuchi (H band) NSgr 2001 (J band)MNRAS, 2006, in press
Infrared Spectra of V445 Puppis
Near Infrared Spectra from Mt. Abu ObservatoryHydrogen deficiency confirmed : Unusually rich in CI lines
FIRST OBSERVED HELIUM NOVA
(2003, A&A, 409, 1007)
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.
From2003, Ap.J(L), 598, L312004, Ap.J(L), 604, L572004, Ap.J(L), 610, L292004, Ap.J(L), 615, L53
AlO Bands in IR Optical spectrum - unusually strong KI, NaI resonance lines
Water ice at 50K at 3 micronsRo-vibrational spectrum ofCO fundamental band
V4332 Sgr
Some results
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
2005, ApJL, 627, L141
V838 Mon eruptedin 2002 and is now surrounded by acool water shell at 800K. Detectionof water lines is ingeneral rare in celes-tial objects and have not been seen earlier in a nova-like object.
Study of Starburst Galaxies
Prodigious starformation rate as compared to normal galaxiesLight dominated by HII regions- ionized by young stars
Aim: To study the morphology and origin of starburst phenomena
Optically selected sample of 19galaxies from Markarian catalogIncludes all Hubble types
BVRI, H and near IR imaging
1999 A&AS, 139, 1051999 A&A, 352, 1122001 JApA, 22, 155