Publications of the Astronomical Society of the Pacific Volume 34
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...On The Period Ok Capella In discussing the interferometer measures of Capella as a double star an independent and accurate value of the revolution period is very desirable. This can be furnished by a comparison of recent radial velocity observations with similar data obtained at the Lick Observatory1 twenty-two years ago. To determine the period alone a comparatively few observations suffice. The accompanying table gives the data for spectrograms recently obtained at Mt. Wilson. In the successive columns are found: plate number; date and Greenwich mean time of midexposure; measured velocity of the primary reduced to the Sun, obtained from line measurements with a Gartner engine and with the Hartmann spectrocomparator against a sky standard; the mean of these two values; the velocity computed from the Lick Observatory elements; the residual velocity; the measured velocity of the secondary; its computed velocity; and finally, the residuals for the secondary. All plates except y10677 were secured with a three-prism spectrograph having a camera lens of 40-inch focus, attached to the 60-inch reflector. The dispersion at Hy is 5A per mm. y 10677 was secured with a one-prism spectrograph and above mentioned camera lens in which the dispersion of the center of the region used (H8) is 12 A per mm. The velocities derived from this plate are not used in the discussion that follows. Velocity of Primary Measured Date G. M. T. Gaert. Hart. Mean Comp. O-C km./sec. 1921, Not. 24,18 58TM ]12.95 +12.5') +12.77 +11.07 +1.70 + 11.57 +11.78 +11.68 +10.89 +0.79 + 11.14 +10.88 +11.01 + 9.85 +1.16 + 10.96 +11.01 +10.98 + 9.84 +1.14 +2.7 +2.7 +4.3--1.6 + 51.78 +50.65 +51.22 +52.07--0.85 +51.11 +51.80 +51.46 +52.10--0.64 Velocity of Secondary Plate No. Meas....
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- 13 Sep 2013
- United States
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