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13 papers · 1 filter
The primordial lithium abundance
Piercarlo Bonifacio, Paolo Molaro
Lithium abundances in a selected sample of halo stars have been revised by using the new accurate IRFM effective temperatures by Alonso, Arribas & Martinez-Roger (1996a). From 41 p…
Baryonic Density from Primordial Li
Piercarlo Bonifacio, Paolo Molaro
Lithium abundances in a selected sample of halo stars have been revised by using new accurate Teff. From 41 plateau stars we found no evidence for intrinsic dispersion, a tiny tren…
Metal Rich RR Lyrae Variables: I. The Evolutionary Scenario
Giuseppe Bono, Filippina Caputo, Santi Cassisi +2
This paper presents evolutionary computations which investigate the theoretical predictions concerning metal rich RR Lyrae pulsators found both in the Galactic field and in the Gal…
Double-mode RR Lyrae Variables: Pulsational Masses Revisited
Giuseppe Bono, Filippina Caputo, Vittorio Castellani +1
Double-mode RR Lyrae variables (i.e. radial variables which are simultaneously pulsating in both fundamental and first overtone modes) appear a fundamental tool for investigating t…
Second Overtone Pulsators Among Delta Scuti Stars
Giuseppe Bono, Filippina Caputo, Santi Cassisi +3
We investigate the modal stability of stellar models at masses and luminosity levels corresponding to post main sequence luminous delta scuti pulsators. The envelope models have be…
Compact Group Selection From Redshift Surveys
Elizabeth Barton, Margaret J. Geller, Massimo Ramella +2
For the first time, we construct a catalog of compact groups selected from a complete, magnitude-limited redshift survey. We select groups with members based on projecte…