Radial velocities of southern stars obtained with the photoelectric scanner Coravel. VII - Radial velocity variations of eleven Cepheids in the Large and Small Magellanic Clouds

Details Radial velocities of southern stars obtained with the photoelectric scanner Coravel. VII - Radial velocity variations of eleven Cepheids in the Large and Small Magellanic Clouds Radial velocities of southern stars obtained with the photoelectric scanner Coravel. VII - Radial velocity variations of eleven Cepheids in the Large and Small Magellanic Clouds

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...81..339i&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 81, no. 3, Dec. 1989, p. 339-351. Research supported by SNSF

Physics

Optics

13

Cepheid Variables, Magellanic Clouds, Radial Velocity, Sky Surveys (Astronomy), Binary Stars, Cassegrain Optics, Periodic Variations, Stellar Magnitude

Scientific paper

We present a second list of systematic radial-velocity measurements of Magellanic-Cloud Cepheids. For five Cepheids in the Large Magellanic Cloud and six in the Small, we give 615 radial-velocity measurements, covering their complete periods. The B magnitudes range from 12.5 to 15.0, and the periods from 42.7 to 134.7 days. All measurements were made with the Coravel photoelectric scanner attached to the Cassegrain focus of the 1.54 m Danish telescope at La Silla, ESO, in Chile, from January 1981 to November 1987. The number of observations for each star varies from 40 to 92. Among the Cepheids, we have identified three long-period spectroscopic binaries. For the remaining Cepheids, radial velocity versus phase diagrams have been fitted by an analytic relation, and the stellar radius variation has been derived by integration of this relation over the whole period.

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