Search Publications
ISO LWS Observations of H2O from R Cas: A Consistent Model For Its Circumstellar Envelope
Omont, A.; Barlow, M. J.; Cox, P. +6 more
We present an ISO LWS 43-197 µm grating spectrum of the oxygen-rich AGB star R Cas. The spectrum is rich of isolated and blended H2O lines. For their identification and in order to determine the physical parameters of the circumstellar envelope, we have constructed a model which treats radiative transfer, chemical exchange and photodissociation re…
The Absolute Magnitude of RR Lyraes: from HIPPARCOS Parallaxes and Proper Motions
Solano, E.
We have used HIPPARCOS proper motions and the method of Statistical Parallax to estimate the absolute magnitude of RR Lyrae stars. In addition, we have used the HIPPARCOS parallax of RR Lyr itself to determine its absolute magnitude. These two results are in excellent agreement with each other and give a zero-point for the RR Lyrae Mv,[…
Distance Scales After HIPPARCOS
Feast, M. W.
A general review is given of the use of Hipparcos data to calibrate basic distance indicators.
ISOPHOT Mapping Observations of Carbon Stars
Izumiura, H.; Hashimoto, O.
Mapping observations have been made toward five carbon stars in the far-infrared using ISOPHOT, an imaging photo-polarimeter on board the Infrared Space Observatory. Cold, very extended dust shells are clearly revealed in two of them. Y CVn is surrounded by a very extended, detached dust shell, which indicates a sudden decline of the mass-loss by …
Calibration of the Classical Cepheid Period-Luminosity Relation from HIPPARCOS Data
Luri, X.; Figueras, F.; Torra, J. +3 more
The calibration of the classical Cepheid Period-Luminosity (PL) relation is a fundamental step for the determination of the cosmic distance scale. In this paper a calibration obtained from Hipparcos data is presented and used to estimate the LMC distance modulus. A value of 18.35m ± 0.13 is obtained.
Spectroscopic Survey of δ SCT Stars
Solano, E.; Pintado, O. I.
The methods used to derive effective temperatures, projected rotational velocities and surface gravities of a sample of low and high-amplitude δ Sct stars are presented here. Effective temperatures were derived using Hα and Hβ line profiles whereas rotational velocities were calculated following the method described in Solano & Fernley (1997).…