Bibcode
Jimenez-Esteban, F.; Garcia-Lario, P.; Manchado, A.; Engels, D.
Referencia bibliográfica
Asymptotic Giant Branch Stars, IAU Symposium 191 Poster Session, #P2-13, held in Montpellier, France, Aug 28 - Sept 1, 1998.
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1998
Número de citas
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Descripción
We present the results of a long-term near infrared monitoring program
(observations in the J, H and K bands) which was carried out on a
selected sample of 25 OH/IR stars included in the IRAS Point Source
Catalogue. They show a wide variety of infrared and OH maser
luminosities, expansion velocities and LRS types. In the IRAS two-colour
diagram [12]-[25] vs. [25]-[60] they are also located at different
positions along the sequence of colours typically associated with OH/IR
stars. The observations have been carried out using the infrared 1.5 m
Sanchez Magro Telescope (SMT) at Izana (Tenerife, Spain) since the
beginning of 1991 until the end of 1997. We have derived periods and
amplitudes for fourteen stars, obtaining their light curves, finding in
some cases that the light curves are asymmetric and changes in the mean
magnitudes with time. Furthermore, we have looked for the optical
counterpart of these stars, identifying fifteen of them, whereas nine
did not present any optical counterpart.