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• W2023644506 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Second report on radial velocities of A and K stars fainter than tenth magnitude. Edmondson, Frank K. Abstract Considerable progress has been made since the first report was presented at the Cincinnati meeting.1 Radial velocities have been completed for 628 stars, 489 K stars and `39 A stars; and unmeasured spectra are on hand for 298 more stars, i68 K stars and 130 A stars. The total number of settings made with the Gaertner machine thus far is 187,559. The large velocity-dispersion for the K stars that was reported at the Cincinnati meeting, +27.7 km/sec, is confirmed by the increased data. The material has been subdivided, with the following results: Toward galactic center: = + 29.5 + 1.7 km/sec. Toward direction of rotation: = + 27.2 + I.6 km%ec. Toward galactic pole: = + 32.1 + 2.2 km%ec. In contrast with this, the A stars give a dispersion of only +~6 km/sec. No A star has yet been found with a peculiar radial velocity larger than 63 km/sec. Thus far 29, or 6 per cent, of the K stars observed have peculiar radial velocities greater than 63 km/sec. These are all directed toward galactic longitudes between 1200 and 00. Further conclusions about the percentage of dwarfs (see first report) must await the luminosity classifications. Dr. Vyssotsky is taking charge of this phase of the work. This program has been carried on since 1941 at the McDonald Observatory with the 8~-inch reflector under the terms of the pioneering cooperative agreement between the Universities of Texas, Chicago, and Indiana. Dr. Vyssotsky has been supplying spectral types and apparent magnitudes in advance of publication, as these are the criteria of selection for this program. There have been I ~85 spectrograms taken with the 82- inch, as follows: 657 by Edmondson, 410 by Popper, 150 by Hiltner, 123 by Bauer an Mu~nch, 106 by Deutsch, 102 by Elvey and others, 29 by Struve, and 8 by Cesco. S. A. Mitchell took 270 spectra with the Mount Wilson 6o-inch in 1941 and 1943. The K star program will be completed during the coming year. The A star program will require two or three years more to complete. Projects now under consideration include: observations of faint A and K stars from the Cape Zone Catalogue, provided that the selection according to motion made by the Cape observers can be allowed for, and additional observations of dwarf stars in order to get accurate space velocities. I.A. J. 5', 19, 1944. Kirkwood Observatory, Indiana University. Bloomington, Ind, Publication: The Astronomical Journal Pub Date: February 1947 DOI: 10.1086/105958 Bibcode: 1947AJ.....52..122E full text sources ADS |" @default.
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• W2023644506 date "1947-02-01" @default.
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• W2023644506 title "Second report on radial velocities of A and K stars fainter than tenth magnitude." @default.
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