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Advances in Astronomy
Volume 2015, Article ID 846840, 7 pages
Research Article

Evaluation of the Effective Temperature of Sunspots Using Molecular Parameters of AlF

1Department of Physics, Kamaraj College of Engineering and Technology, Virudhunagar 626 001, India
2Department of Physics, RD Government Arts College, Sivagangai 630 560, India
3Indian Institute of Astrophysics, Bangalore 560 034, India
4Physics Research Centre, V.H.N.S.N College, Virudhunagar 626 001, India

Received 9 September 2014; Revised 4 December 2014; Accepted 15 December 2014

Academic Editor: Dean Hines

Copyright © 2015 K. Balachandrakumar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The physical conditions of celestial objects can be analyzed using the spectrum of atoms or molecules present in the object. The present work focuses on the spectroscopic analysis of astrophysically significant molecule AlF. The evaluation of Franck-Condon (FC) factors and -centroids is done by a numerical integration procedure using the suitable potential energy curves for , , , and band systems of AlF molecule. The intensity of various bands is discussed with the help of derived FC factors. The band degradation and the nature of potential energy curves are studied using -centroid values. The vibrational temperature of sunspot is estimated to be around 1220 ± 130 K which falls in the reported temperature range of cold sunspots.