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Born 151 years ago, Henrietta Swan Leavitt discovered the relation between the luminosity and the period of Cepheid variable stars. It was her discovery that first allowed astronomers to measure the distance between the Earth and faraway galaxies.
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i do digital and film photography, color and b&w.
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A Cepheid is a star that varies in light intensity over regular, measurable periods. The period of pulsation is directly related to a Cepheid's intrinsic brightness making observations of these stars a powerful tool for determining distance. This animation shows a Cepheid variable star varying in brightness in the arm of a spiral galaxy.
Credits: Dana Berry (Skyworks Digital): Lead Animator Michael McClare (HTSI): Writer (NASA)
Estudio confirma que l coche de estrella variable V708 tiene una composiciĂłn quĂmica inusual
Las variables cefeidas (o cefeidas) son estrellas luminosas, amarillas y de rama horizontal que cambian su brillo con el tiempo como resultado de pulsaciones estelares regulares.
Un equipo internacional de astrĂłnomos ha realizado observaciones espectroscĂłpicas de una estrella variable conocida como V708 Car. Los resultados de la campaña de observaciĂłn, publicados en un artĂculo publicado el 20 de febrero en el servidor de preimpresiĂłn arXiv, indican que esta estrella tiene una composiciĂłn quĂmica inusual. Las variables cefeidas (o cefeidas) son estrellas luminosas,…
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