Abstract
Moderate dispersion (46 Å mm−1 at Hα) image-tube spectrum (5800–7300 Å) of the S star π1 Gru is found to exhibit several unidentified molecular features, in addition to the well-known bands of the oxides ofs-process elements. A list is presented of 28 measured unidentified red-degraded bands, of which six, at 5998, 6128, 6143, 6223, 6257, and 6557 Å, are prominent. Of the reported 28 bands, 22 are observed for the first time. A discussion is included on the expected molecular sources of the unidentified features. The possible presence of two new molecules, Pr O and Nd O, in π1 Gru is suggested.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Beaufils, J. Cl., Carette, P., and Blondeau, J. M.: 1979,J. Molec. Spectrosc. 77, 1.
Bernard, A., Bacis, R., and Luc, P.: 1979,Astrophys. J. 227, 338.
Bidelman, W. P. and Stephenson, C. B.: 1957,Mem. Soc. Roy. Sci. Liège Ser. 4 18, 292.
Clegg, R. E. S. and Lambert, D. L.: 1978,Astrophys. J. 226, 931.
Davis, D. N.: 1971,Astrophys. J. 167, 327.
Davis, D. N. and Keenan, P. C.: 1969,Publ. Astron. Soc. Pacific 81, 230.
Dirscherl, R., Michel, K. W., and Cosmovici, C. B.: 1978,Astron. Astrophys. 68, 381.
Huber, K. P. and Herzberg, G.: 1979,Molecular Spectra and Molecular Structure, IV. Constants of Diatomic Molecules, Van Nostrand-Reinhold, New York.
Keenan, P. C.: 1950,Astron. J. 55, 74.
Keenan, P. C.: 1957,Publ. Astron. Soc. Pacific 69, 5.
Lambert, D. L. and Clegg, R. E. S.: 1980,Monthly Notices Roy. Astron. Soc. 191, 367.
Lindgren, B. and Olofsson, G.: 1980,Astron. Astrophys. 84, 300.
Lowater, F.: 1932,Proc. Phys. Soc. 44, 51.
Merrill, P. W.: 1952,Astrophys. J. 116, 21.
Murad, E.: 1978,Chem. Phys. Letters 59, 359.
Murty, P. S.: 1980a,Astrophys. Space Sci. 68, 513.
Murty, P. S.: 1980b,Astrophys. J. 240, 585.
Murty, P. S.: 1982,Astrophys. Letters, in press.
Nordh, H. L., Lindgren, B., and Wing, R. F.: 1977,Astron. Astrophys. 56, 1.
Pearse, R. W. B. and Gaydon, A. G.: 1976,The Identification of Molecular Spectra, 4th ed., Chapman and Hall, London.
Peery, B. F., Jr.: 1971,Astrophys. J. 163, L1.
Peery, B. F., Jr.: 1979,Publ. Astron. Soc. Japan 31, 461.
Rosen, B.: 1970,Selected Constants — Spectroscopic Data Relative to Diatomic Molecules, Pergamon, London.
Sauval, A. J.: 1978,Astron. Astrophys. 62, 295.
Shenyavskaya, E. A., Egorova, I. V., and Lupanov, V. N.: 1973,J. Molec. Spectrosc. 47, 355.
Shin, J. B. and Nicholls, R. W.: 1977,Spectrosc. Letters 10, 923.
Wing, R. F.: 1972,Mem. Soc. Roy. Sci. Liège, Ser. 6 3, 123.
Wing, R. F., Cohen, J., and Brault, J. W.: 1977,Astrophys. J. 216, 659.
Wyckoff, S. and Clegg, R. E. S.: 1978,Monthly Notices Roy. Astron. Soc. 184, 127.
Wyckoff, S. and Wehinger, P. A.: 1976,Mem. Soc. Roy. Sci. Liège, Ser. (6)9, 445.
Wyckoff, S. and Wehinger, P. A.: 1977,Astrophys. J. 212, L139.
Author information
Authors and Affiliations
Additional information
This paper is dedicated to the memory of Dr. M. K. V. Bappu.
Rights and permissions
About this article
Cite this article
Murty, P.S. Unidentified molecular features in the red spectrum (5800 to 7300 Å) of PI Gruis. Astrophys Space Sci 88, 189–196 (1982). https://doi.org/10.1007/BF00648999
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00648999