Abstract Details
| Name: Rahul Kumar Anand Affiliation: D.D.U. Gorakhpur University, Gorakhpur, 273009 Conference ID: ASI2018_679 Title : Study of correlation between optical and infrared bands in some carbon rich late type stars Authors and Co-Authors : Shantanu Rastogi^1 and Brijesh Kumar^2 1^D.D.U. Gorakhpur University, Gorakhpur-273009 2^ARIES, Manora Peak, Nainital (Uttarakhand)-263002 Abstract Type : Poster Abstract Category : Stars,ISM and the Galaxy Abstract : Observations from space telescopes, particularly infrared telescopes (IRAS, ISO and Spitzer), indicate that the mid infrared emission features at 3.3, 6.2, 7.7, 8.6, 11.2 and 12.7 µm in nebular spectra are of generic nature. These features are attributed to Polycyclic Aromatic Hydrocarbon (PAH) molecules pumped by background UV radiations and are popularly known as Aromatic Infrared Bands (AIBs). It is understood that the circumstellar shells of carbon rich late type stars are the breeding ground for the PAH formation. The AIBs profile varies between objects indicating different PAH populations and different physiochemical environments. In order to get a better understanding of these environments, optical observations are performed to look for correlation, if any, between optical attributes and the AIBs. The optical and near IR observation have been done from ground based Devsthal Optical Telescopes, ARIES, Nainital on some selected carbon rich late type stars in the planetary nebulae (PNe) phase. Various photometric parameters are derived. The mid-infrared data for these objects are obtained from the archival data of Infrared Space Observatory (ISO). There exists a good correlation between object type and mid-infrared features. But there are some objects, which show complex emission profile around certain wavelengths. A detailed study may help to understand PAH formation and the physical and chemical evolution of late type stars. |