Abstract

A photoelectric stellar spectrophotometer, with 0.3-Å resolution, for use near Hα (6563 Å) is described. A Fabry-Perot etalon and an echelle grating are simultaneously pressure-scanned. The Fabry-Perot can be bypassed and the grating system used alone to obtain narrow-band (4.89-Å) Hα indices, in which case the pressure system allows the necessary radial velocity corrections to be made conveniently.

© 1972 Optical Society of America

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References

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  1. J. G. Hirschberg, R. R. Kadesch, J. Opt. Soc. Am. 48, 177 (1958).
    [CrossRef]
  2. M. J. Price, Monthly Notices Roy. Astron. Soc. 133, 449 (1966).
  3. P. Jacquinot, J. Opt. Soc. Am. 44, 761 (1954).
    [CrossRef]
  4. P. Jacquinot, Rept. Progr. Phys. 23, 267 (1960).
    [CrossRef]
  5. A. H. Vaughan, Ann. Rev. Astron. Ap. 5, 139 (1967).
    [CrossRef]
  6. J. F. Verrill, Optica Acta 17, 747 (1970).
    [CrossRef]
  7. B. Bates, D. J. Bradley, T. Kohno, H. W. Yates, J. Sci. Instrum. 43, 476 (1966).
    [CrossRef]
  8. C. Fabry, A. Perot, Astrophys. J. 15, 81 (1902).
  9. P. H. Hindle, N. K. Reay, J. Ring, J. Sci. Instrum. 44, 646 (1967).
    [CrossRef]
  10. J. D. Geake, J. Ring, N. J. Woolf, Mon. Not. Roy. Astron. Soc. 119, 616 (1959).
  11. P. H. Hindle, N. K. Reay, J. Sci. Instrum. 44, 350 (1967).
  12. A. D. Code, Stars and Stellar Syst. 6, 50 (1960).

1970

J. F. Verrill, Optica Acta 17, 747 (1970).
[CrossRef]

1967

P. H. Hindle, N. K. Reay, J. Ring, J. Sci. Instrum. 44, 646 (1967).
[CrossRef]

P. H. Hindle, N. K. Reay, J. Sci. Instrum. 44, 350 (1967).

A. H. Vaughan, Ann. Rev. Astron. Ap. 5, 139 (1967).
[CrossRef]

1966

B. Bates, D. J. Bradley, T. Kohno, H. W. Yates, J. Sci. Instrum. 43, 476 (1966).
[CrossRef]

M. J. Price, Monthly Notices Roy. Astron. Soc. 133, 449 (1966).

1960

P. Jacquinot, Rept. Progr. Phys. 23, 267 (1960).
[CrossRef]

A. D. Code, Stars and Stellar Syst. 6, 50 (1960).

1959

J. D. Geake, J. Ring, N. J. Woolf, Mon. Not. Roy. Astron. Soc. 119, 616 (1959).

1958

1954

1902

C. Fabry, A. Perot, Astrophys. J. 15, 81 (1902).

Bates, B.

B. Bates, D. J. Bradley, T. Kohno, H. W. Yates, J. Sci. Instrum. 43, 476 (1966).
[CrossRef]

Bradley, D. J.

B. Bates, D. J. Bradley, T. Kohno, H. W. Yates, J. Sci. Instrum. 43, 476 (1966).
[CrossRef]

Code, A. D.

A. D. Code, Stars and Stellar Syst. 6, 50 (1960).

Fabry, C.

C. Fabry, A. Perot, Astrophys. J. 15, 81 (1902).

Geake, J. D.

J. D. Geake, J. Ring, N. J. Woolf, Mon. Not. Roy. Astron. Soc. 119, 616 (1959).

Hindle, P. H.

P. H. Hindle, N. K. Reay, J. Ring, J. Sci. Instrum. 44, 646 (1967).
[CrossRef]

P. H. Hindle, N. K. Reay, J. Sci. Instrum. 44, 350 (1967).

Hirschberg, J. G.

Jacquinot, P.

P. Jacquinot, Rept. Progr. Phys. 23, 267 (1960).
[CrossRef]

P. Jacquinot, J. Opt. Soc. Am. 44, 761 (1954).
[CrossRef]

Kadesch, R. R.

Kohno, T.

B. Bates, D. J. Bradley, T. Kohno, H. W. Yates, J. Sci. Instrum. 43, 476 (1966).
[CrossRef]

Perot, A.

C. Fabry, A. Perot, Astrophys. J. 15, 81 (1902).

Price, M. J.

M. J. Price, Monthly Notices Roy. Astron. Soc. 133, 449 (1966).

Reay, N. K.

P. H. Hindle, N. K. Reay, J. Sci. Instrum. 44, 350 (1967).

P. H. Hindle, N. K. Reay, J. Ring, J. Sci. Instrum. 44, 646 (1967).
[CrossRef]

Ring, J.

P. H. Hindle, N. K. Reay, J. Ring, J. Sci. Instrum. 44, 646 (1967).
[CrossRef]

J. D. Geake, J. Ring, N. J. Woolf, Mon. Not. Roy. Astron. Soc. 119, 616 (1959).

Vaughan, A. H.

A. H. Vaughan, Ann. Rev. Astron. Ap. 5, 139 (1967).
[CrossRef]

Verrill, J. F.

J. F. Verrill, Optica Acta 17, 747 (1970).
[CrossRef]

Woolf, N. J.

J. D. Geake, J. Ring, N. J. Woolf, Mon. Not. Roy. Astron. Soc. 119, 616 (1959).

Yates, H. W.

B. Bates, D. J. Bradley, T. Kohno, H. W. Yates, J. Sci. Instrum. 43, 476 (1966).
[CrossRef]

Ann. Rev. Astron. Ap.

A. H. Vaughan, Ann. Rev. Astron. Ap. 5, 139 (1967).
[CrossRef]

Astrophys. J.

C. Fabry, A. Perot, Astrophys. J. 15, 81 (1902).

J. Opt. Soc. Am.

J. Sci. Instrum.

P. H. Hindle, N. K. Reay, J. Ring, J. Sci. Instrum. 44, 646 (1967).
[CrossRef]

P. H. Hindle, N. K. Reay, J. Sci. Instrum. 44, 350 (1967).

B. Bates, D. J. Bradley, T. Kohno, H. W. Yates, J. Sci. Instrum. 43, 476 (1966).
[CrossRef]

Mon. Not. Roy. Astron. Soc.

J. D. Geake, J. Ring, N. J. Woolf, Mon. Not. Roy. Astron. Soc. 119, 616 (1959).

Monthly Notices Roy. Astron. Soc.

M. J. Price, Monthly Notices Roy. Astron. Soc. 133, 449 (1966).

Optica Acta

J. F. Verrill, Optica Acta 17, 747 (1970).
[CrossRef]

Rept. Progr. Phys.

P. Jacquinot, Rept. Progr. Phys. 23, 267 (1960).
[CrossRef]

Stars and Stellar Syst.

A. D. Code, Stars and Stellar Syst. 6, 50 (1960).

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Figures (7)

Fig. 1
Fig. 1

The pressure-scanned, Hα spectrophotometer mounted at the Cassegrainian focus of the 1-m telescope.

Fig. 2
Fig. 2

Optical path diagram showing components (except windows). (1) Centerpiece, (2) collimating lens, (3) grating (grooves on bottom), (4) multiple slit, (5) weak lens, (6) sliding mirrors, (7) matched collimating lenses, (8) Fabry-Perot etalon, (9) Pellin-Broca prism, (10) focusing lens, (11) final slit, (12) No. 29 Wratten filter, (13) Fabry lenses, (14) photomultipliers.

Fig. 3
Fig. 3

The multiple slit. The spectrum is dispersed vertically, and the slit is translated horizontally in order to use the different bandwidths. The slit widths are 17.84 mm, 3.57 mm, 1.65 mm, and 0.17 mm.

Fig. 4
Fig. 4

Transmittance profiles defined by the Fabry-Perot and by the slits. Note that the Fabry-Perot passband width is exaggerated in the drawings.

Fig. 5
Fig. 5

Schematic diagram giving some basic parameters of the total optical system (including telescope). Most components (except for flat mirrors) labeled in Fig. 2 are shown. Focal lengths are indicated for lenses and mirrors.

Fig. 6
Fig. 6

Etalon holder (based on design by Hindle et al.). The etalon plates are 35 mm in diameter.

Fig. 7
Fig. 7

A sample observation with the Fabry-Perot of the Hα line in α Orionis. An intensity of 1.000 is the intensity in the continuum (see text). The wavelength scale is given in velocity units (45.7 km/sec corresponds to a Doppler displacement of 1.0 Å at Hα). The zero point corresponds to the laboratory wavelength of Hα, to within about 5 km/sec. The various symbols refer to separate but consecutive scans.

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