Radial velocities of southern stars obtained with the photoelectric scanner CORAVEL. III - 790 late-type bright stars

Details Radial velocities of southern stars obtained with the photoelectric scanner CORAVEL. III - 790 late-type bright stars Radial velocities of southern stars obtained with the photoelectric scanner CORAVEL. III - 790 late-type bright stars

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26as...59...15a&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 59, Jan. 1985, p. 15-36. Research supported by the Swiss Nat

Astronomy and Astrophysics

Astrophysics

40

Astronomical Catalogs, Late Stars, Radial Velocity, Southern Sky, Astronomical Photography, Electrophotometry

Scientific paper

This paper presents 1595 photoelectric radial velocity observations for 790 bright southern stars of spectral type F5 and later. It includes all such stars in the Bright Star Catalogue without previous radial velocity data. Based on two CORAVEL observations per star, the mean velocities are accurate to about 0.15 km s-1 r.m.s. for sharp-lined constant stars, errors increasing somewhat for stars with significant rotation 46 probable and 127 certain velocity variables have been found, including 10 double-lined spectroscopic binaries. The present data complete and supersede the preliminary data for ˜ 500 stars supplied by us in advance of publication for inclusion in the fourth edition of the Bright Star Catalogue (Hoffleit, 1982). We have compared the photoelectric and photographic techniques for radial velocity determination of bright stars by assessing the efforts spent on the CORAVEL programme and the matching programme of conventional coude' spectroscopy by Andersen and Nordstrom (l983b, c; 1984). With the number and brightness of the programme stars, telescope size (Danish and ESO 1.5-m), and site being the same, the CORAVEL observations required about half the telescope time needed for the coude programme, a gain that would be larger for fainter stars. In the latter programme, furthermore, the additional plate processing and measuring time was in turn about twice the actual observing time. The CO RAVEL mean velocities have mean errors about 1/6 of the coude data, a gain in weight by a factor ˜30.

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