Abstract

The apparatus used by the Rome Astronomical Observatory expedition for the measurement of the extreme solar limb darkening at the total solar eclipse, on 7 March 1970, in Mexico, is described here. For the measurements, the method of Julius is followed. The apparatus consists of a photoelectric photometer with a mechanical chopper, which alternatively inserts the different color filters. The recording and command system is also described.

© 1970 Optical Society of America

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References

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  1. M. Cimino, V. Croce, G. A. De Biase, Atti Accad. Naz. Lincei, Rend. 48, 2, 514 (1970).
  2. M. Hubenet, C. de Jager, Bull. Astron. Inst. Neth. 13, 43 (1956).
  3. J. R. W. Heintze, Bull. Astron. Inst. Neth. 20, 137 (1969).
  4. L. Goldberg, A. K. Pierce, Handbuch Physik 52, 12 (1959).
  5. M. Mädlow, Astron. Nachr. 286, 271 (1961).
    [CrossRef]
  6. C. B. Watts, The Marginal Zone of the Moon (U.S. Govt. Printing Office, Washington, D. C., 1963).
  7. M. Cimino, G. A. De Biase, U. Bartolini, Mem. SAI 39, 125 (1968).

1970

M. Cimino, V. Croce, G. A. De Biase, Atti Accad. Naz. Lincei, Rend. 48, 2, 514 (1970).

1969

J. R. W. Heintze, Bull. Astron. Inst. Neth. 20, 137 (1969).

1968

M. Cimino, G. A. De Biase, U. Bartolini, Mem. SAI 39, 125 (1968).

1961

M. Mädlow, Astron. Nachr. 286, 271 (1961).
[CrossRef]

1959

L. Goldberg, A. K. Pierce, Handbuch Physik 52, 12 (1959).

1956

M. Hubenet, C. de Jager, Bull. Astron. Inst. Neth. 13, 43 (1956).

Bartolini, U.

M. Cimino, G. A. De Biase, U. Bartolini, Mem. SAI 39, 125 (1968).

Cimino, M.

M. Cimino, V. Croce, G. A. De Biase, Atti Accad. Naz. Lincei, Rend. 48, 2, 514 (1970).

M. Cimino, G. A. De Biase, U. Bartolini, Mem. SAI 39, 125 (1968).

Croce, V.

M. Cimino, V. Croce, G. A. De Biase, Atti Accad. Naz. Lincei, Rend. 48, 2, 514 (1970).

De Biase, G. A.

M. Cimino, V. Croce, G. A. De Biase, Atti Accad. Naz. Lincei, Rend. 48, 2, 514 (1970).

M. Cimino, G. A. De Biase, U. Bartolini, Mem. SAI 39, 125 (1968).

de Jager, C.

M. Hubenet, C. de Jager, Bull. Astron. Inst. Neth. 13, 43 (1956).

Goldberg, L.

L. Goldberg, A. K. Pierce, Handbuch Physik 52, 12 (1959).

Heintze, J. R. W.

J. R. W. Heintze, Bull. Astron. Inst. Neth. 20, 137 (1969).

Hubenet, M.

M. Hubenet, C. de Jager, Bull. Astron. Inst. Neth. 13, 43 (1956).

Mädlow, M.

M. Mädlow, Astron. Nachr. 286, 271 (1961).
[CrossRef]

Pierce, A. K.

L. Goldberg, A. K. Pierce, Handbuch Physik 52, 12 (1959).

Watts, C. B.

C. B. Watts, The Marginal Zone of the Moon (U.S. Govt. Printing Office, Washington, D. C., 1963).

Astron. Nachr.

M. Mädlow, Astron. Nachr. 286, 271 (1961).
[CrossRef]

Atti Accad. Naz. Lincei, Rend.

M. Cimino, V. Croce, G. A. De Biase, Atti Accad. Naz. Lincei, Rend. 48, 2, 514 (1970).

Bull. Astron. Inst. Neth.

M. Hubenet, C. de Jager, Bull. Astron. Inst. Neth. 13, 43 (1956).

J. R. W. Heintze, Bull. Astron. Inst. Neth. 20, 137 (1969).

Handbuch Physik

L. Goldberg, A. K. Pierce, Handbuch Physik 52, 12 (1959).

Mem. SAI

M. Cimino, G. A. De Biase, U. Bartolini, Mem. SAI 39, 125 (1968).

Other

C. B. Watts, The Marginal Zone of the Moon (U.S. Govt. Printing Office, Washington, D. C., 1963).

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Figures (10)

Fig. 1
Fig. 1

Schematic drawing of the optical system.

Fig. 2
Fig. 2

Equatorial mounting used at the eclipse of 7 March 1970.

Fig. 3
Fig. 3

The chopper. The holes near the center contain the color filters; those near the limb contain the calibration filters.

Fig. 4
Fig. 4

S-20 cathode response and solar limb darkening at r = 0.995. The first curve utilizes the metric at the left, the second one utilizes the metric at the right.

Fig. 5
Fig. 5

Block diagram of the recording and command system.

Fig. 6
Fig. 6

Diagram of the automatic amplification control.

Fig. 7
Fig. 7

Block diagram of the programmer.

Fig. 8
Fig. 8

Functional diagram of the programmer.

Fig. 9
Fig. 9

Relative errors in function of the photomultiplier signal amplitude.

Fig. 10
Fig. 10

Part of the rapid recording a few seconds after the third contact. For the explanation of numbers and letters, see Table I. The thin drawn lines connect the calibration levels; the thick lines connect the measured light intensities. In the upper part of the figure, the time marker (10−1 sec) is shown.

Tables (2)

Tables Icon

Table I Sequence of Chopper Filters

Tables Icon

Table II Characteristics

Equations (1)

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J λ ( r ) = r 1 I λ ( r ) A ( r , δ ) d r ; δ = R crescent - r r ; r 1 ,

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