Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1681c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, May 1991, p. 1681-1692. Research supported by NSERC and NASA.
Astronomy and Astrophysics
Astronomy
18
Cepheid Variables, Globular Clusters, Radial Velocity, Stellar Spectrophotometry, Charge Coupled Devices, Magellanic Clouds, Stellar Oscillations
Scientific paper
Radial velocities and CCD photometry suitable for a Baade-Wesselink analysis are now available for six short-period Cepheids (HV12198, HV12199, HV12202, HV12203, HV12204, and V4) in the LMC cluster NGC 1866. As a prerequisite for such an analysis, O-C diagrams have been constructed and examined for seven of the NGC 1866 Cepheids (HV12197, HV12198, HV12199, HV12200, HV12202, HV12203, and HV12204), yielding improved periods and estimates of the rate of period change in these coeval variables. One star, HV12198, shows possible evidence for period change, but the phase mismatch due to that change is small enough to have negligible effect on its Baade-Wesselink radius. The computed radii are in good agreement with the Baade-Wesselink, theoretical and cluster/association period-radius relations of Fernie (1984) and the Galactic relation of Coulson and Caldwell (1989). The Flower (1977) color-effective temperature relation and the Becker et al. (1977) mass-luminosity relation lead to mean masses of 4.9 + or - 0.5 solar masses and 4.6 + or - 0.5 solar masses for the respective metallicities of (Y,Z) = (0.0273,0.0016) and (0.026,0.02). Pulsation constants are also computed for these stars.
Cote' Patrick
Fischer Philippe
Madore Barry F.
Mateo Mario
Welch Douglas L.
No associations
LandOfFree
Baade-Wesselink radii for NGC 1866 Cepheids does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Baade-Wesselink radii for NGC 1866 Cepheids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Baade-Wesselink radii for NGC 1866 Cepheids will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1035777