Hostname: page-component-5c6d5d7d68-wtssw Total loading time: 0 Render date: 2024-08-15T12:39:11.743Z Has data issue: false hasContentIssue false
  • English
  • Français

Observations of Interstellar Reddening in Cygnus and Perseus1

Published online by Cambridge University Press:  08 February 2017

K Nandy
K Nandy*
Affiliation:
Royal Observatory Edinburgh, Scotland

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The Object of the Edinburgh Spectrophotometry Survey is to determine the interstellar extinction law as precisely as possible and to search for intrinsic variations in it. The observations have been extended to early type stars up to a limiting magnitude of 11ṃ0 in regions extending from lII = 50° to lII = 200°. The 16/24/60-inch Schmidt telescope of the Royal Observatory has been used in conjunction with an objective prism and grating. Spectra extend from λ = 3300 Å to λ = 9000 Å with a dispersion of 1000 Å/mm at Hγ. Since few stars fainter than 9m have been measured in earlier investigations, the present survey extends considerably the amount of information available.

In determining the extinction from a comparison of pairs of stars, one reddened and the other unreddened, one is faced by the problem of having to find two intrinsically similar stars in the same galactic region.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 7: Proper Motions , August 1965 , pp. 17 - 25
Copyright
Copyright © Kluwer Academic Publishers 1965

Footnotes

1

The contents of this paper were published previously in the Pub. Roy Obs Edinburgh vol. 3, 1964, p. 142, and vol. 5, 1965, p. 13.

References

1. Guthrie, B. N. G.; Lawrence, L. C.; Nandy, K.; Pratt, N. M.; and Reddish, V. C.: Spectrophotometry and Multicolor Photometry at the Royal Observatory, Edinburgh. Communication Roy. Obs. Edinburgh, no. 27, 1965.Google Scholar
2. Baker, E. A.: Spectrophotometric Measurements of Early-Type Stars I. Methods of Observation and Results for Oe 5 Stars. Pub. Roy. Obs. Edinburgh, vol. 1, 1949, p. 15.Google Scholar
3. Nandy, K.: Observations of Interstellar Reddening I. Results for Region in Cygnus. Pub. Roy. Obs. Edinburgh, vol. 3, no. 6, 1964, p. 142.Google Scholar
4. Nandy, K.: Observations of Interstellar Reddening II. Results for Region in Perseus. Pub. Roy. Obs. Edinburgh, vol. 5. no. 2, 1965, p. 13.Google Scholar
5. Rodgers, A. W.: Photoelectric Spectrophotometry of O-Type Stars. Roy. Astron. Soc. Monthly Notices, vol. 122. 1961. p. 413.CrossRefGoogle Scholar
6. Whitford, A. E.: The Law of Interstellar Reddening. Astron. J., vol. 63, 1958, p. 201.10.1086/107725CrossRefGoogle Scholar
7. Greenberg, J. M.; and Meltzer, A. S.: The Effect of Orientation of Non-Spherical Particles on Interstellar Extinction. Astrophvs. J., vol. 132, 1960, p. 667.Google Scholar
8. Wilson, R.: The Relation Between Interstellar Extinction and Polarization. Roy. Astron. Soc., Monthly Notices, vol. 120, 1960, p. 51.10.1093/mnras/120.1.51CrossRefGoogle Scholar
9. Underhill, A. B.; and Walker, G. H.: The Shape of the Interstellar Reddening Curve. Roy. Astron. Soc., Monthly Notices. 1965.Google Scholar
10. Johnson, H. L.: Interstellar Extinction in the Galaxy. Astrophys. J., vol. 141, 1965, p. 923.10.1086/148186CrossRefGoogle Scholar
11. Mendoza, E. E., V: La Ley de Extincion Interestallar en las Pleyades. Tonantazintla y Tacubaya, vol. 4, no. 26, 1965.Google Scholar
12. Johnson, H. L.; and Borgman, J.: The Law of Interstellar Extinction. Bull. Astron. Inst. Netherlands, vol. 17, 1963, p. 115.Google Scholar
13. Nandy, K.; and Wickramasinghe, N. C.: A Survey of Recent Interstellar Reddening Observations. Pub. Roy. Obs. Edinburgh, vol. 5, no. 3, 1965, p. 29.Google Scholar
14. Wickramasinghe, N. C.; and Guillaume, C.: Interstellar Extinction by Graphite Grains. Nature, vol. 207, 1965, p. 366.10.1038/207366a0CrossRefGoogle Scholar