IAA : Información y actualidad astronómica (12)

Sumario : INVESTIGACIÓN : El misterioso arco de Lynx.-- Microlentes gravitatorias: lupas del Universo.-- VENTANA ABIERTA...hasta que la gorda cante.-- CHARLAS CON... Don Cox y Ron Reynolds.-- ACTUALIDAD CIENTÍFICA : Explosiones en la superficie solar.-- La galaxia de Canis Major: una bienvenida intrusa.-- Actividades IAA.-- Agenda.Esta revista se publica con la ayuda de la Acción Especial DIS 2003-10261-E del Programa Nacional de Difusión y divulgación de la Ciencia y la Tecnología, del Ministerio de Ciencia y Tecnología.N

Reproductive biology of the pampas deer (Ozotoceros bezoarticus): a review

The pampas deer (Ozotoceros bezoarticus) is a South American grazing deer which is in extreme danger of extinction. Very little is known about the biology of the pampas deer. Moreover, most information has not been published in peer-reviewed scientific journals, and is only available in local publications, theses, etc. Therefore, our aim was to update and summarize the available information regarding the reproductive biology of the pampas deer. Moreover, in most sections, we have also included new, unpublished information. Detailed descriptions are provided of the anatomy of both the female and the male reproductive tract, puberty onset, the oestrous cycle and gestational length. Birthing and the early postpartum period are described, as are maternal behaviour and early fawn development, seasonal distribution of births, seasonal changes in male reproduction and antler cycle, reproductive behaviour, semen collection, and cryopreservation. Finally, an overview is given and future directions of research are proposed

Temporal evolution of the Evershed flow and its magnetic properties

Tesis en colaboración con el Instituto de Astrofísica de Andalucía del CSIC.Tesis Univ. Granada. Departamento de Física Aplicada. Leída el 1 de junio de 200

Sensitivity of spectral lines to temperature, velocity, and magnetic field

13 pages, 11 figures, 1 table + Appendix A (3 suppl. tables).We present an analytical and numerical study of the sensitivity of weak solar photospheric lines to temperature, velocity, and magnetic fields. Our investigation is based on the concept of response functions (Landi degl'Innocenti & Landi degl'Innocenti 1977; Ruiz Cobo & del Toro Iniesta 1994). Lines commonly used in solar spectropolarimetry, like Fe(I) 630.25 nm in the visible and Fe(I) 1564.85 nm in the infrared, are examined in detail as emerging from reference quiet Sun and sunspot models. We develop a simple phenomenological model capable of describing the response of any given line to these atmospheric parameters. We find that: (a) the sensitivity of the lines to velocity and magnetic fields increases with the sharpness of the intensity and circular polarization profiles; (b) the sensitivity to temperature is determined mainly by the variation of the source function with temperature, which is smaller at longer wavelengths; and (c) lines quoted to be insensitive to temperature, like Fe(I) 1564.85 nm and Fe(I) 557.61 nm, exhibit larger changes in equivalent width than lines presumed to have higher sensitivities to T, such as Fe(I) 630.25 nm. The relations provided by our model are universal and can be used to decide which line is better suited to measuring a given atmospheric parameter. The results of this study are of practical interest for the design of new instruments and for better exploitation of existing ones.This work was supported by the Programa Ramón y Cajal of the Spanish Ministerio de Educación y Ciencia, project AyA2001-1649 of the Spanish Programa Nacional de Astronomía y Astrofísica, and projects ESP2002-04256-C04-01 and ESP2003-07735-C04-03 of the Programa Nacional del Espacio, partly using European FEDER funds.Peer reviewe