{"id":9113,"date":"2021-04-15T17:50:34","date_gmt":"2021-04-15T15:50:34","guid":{"rendered":"http:\/\/galhassin.it\/ricerca\/stelle-variabili\/"},"modified":"2021-06-16T10:26:41","modified_gmt":"2021-06-16T08:26:41","slug":"variable-stars","status":"publish","type":"page","link":"https:\/\/galhassin.it\/en\/research\/variable-stars\/","title":{"rendered":"Variable Stars"},"content":{"rendered":"<div id=\"editoriale-block_6078605fb866f\" class=\"editoriale is-inner-padding-block break-article-column z-1 has-white-background-color border-top-1 border-bottom-1  back-icons icons-is-blue\">\n    <div class=\"galhassin-general-container mx-auto px-3 px-md-0 d-flex flex-wrap justify-content-between on-icons no-parallax\" >\n                    <div class=\"col-sx c-md-pt-12 c-md-pb-12 pt-5 pb-5 z-1\">\n                <div class=\"affix-top\">\n                        <ul class=\"noList pl-0 mt-md-5 ml-0 is-col-download pr-0 mb-md-5 mb-4\">\n        <p class=\"caption semiBold g-txt\">\n            Risorse        <\/p>\n                    <li class=\"download-list border-top-1 mt-3 pt-3\">\n                <a href=\"https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_CS_vfinale.pdf\" download class=\"has-dark-blue-color noLink d-flex flex-wrap align-items-start mb-2 download-item no-anim \">\n                    <svg role=\"img\" class=\"icon icon-sm mr-2 has-dark-blue-fill\">\n                        <use xlink:href=\"https:\/\/galhassin.it\/wp-content\/themes\/galhassin\/assets\/bootstrap-italia\/svg\/sprite.svg#it-download\"><\/use>\n                    <\/svg>\n                    <p class=\"g-txt caption g-txt\">\n                        La scoperta di GALVAR-1                    <\/p>\n                <\/a>\n            <\/li>\n            <\/ul>\n                <\/div>\n            <\/div>\n                <div class=\"col-dx mr-0 ml-auto c-md-pt-12 c-md-pb-12 pt-5 pb-5 z-1\">\n            <h5 class=\"mt-4 mb-3 mb-md-4  is-col-title g-txt\">The third research area concerns the observation, monitoring and discovery of variable stars.<\/h5><p class=\"mt-4 is-col-text g-txt\">\n    This work consists in recognizing variable sources that are not yet known. In astronomical research and, in particular, in photometry studies sample stars are used, whose brightness is well known.<br \/>\r\n<br \/>\r\nIf, therefore, the brightness of a sample source is assumed to be constant while it actually isn&#8217;t, errors and uncertainties are introduced in the results.<br \/>\r\n<br \/>\r\nThe experience accumulated in photometric measurements of exoplanetary transits has been instrumental to GAL Hassin&#8217;s widening the range of its research and its devising a protocol for the detection of variable stars.<br \/>\r\n<br \/>\r\nOn August 9, 2020, while monitoring an exoplanetary transit, GAL Hassin discovered a new variable star, which has been named GALVAR1, located in the constellation of Andromeda, about 4500 light years from Earth.<br \/>\r\n<br \/>\r\nThe observation was made for five hours, producing a set of 700 30-second images, acquired with an R filter using the Galhassin Robotic Telescope 2 (GRT2, pictured below). Each white dot is a star, captured within an area of sky 40\u00d740 arcmin in size: not much larger than the disk of the full moon. The one circled in red is the GALVAR-1 star.<\/p>\n<img loading=\"lazy\" decoding=\"async\" width=\"722\" height=\"658\" src=\"https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/field_GRT2_mark.png\" class=\"mt-md-5 mb-md-5 c-mb-3 c-mt-3 d-table\" alt=\"\" srcset=\"https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/field_GRT2_mark.png 722w, https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/field_GRT2_mark-600x547.png 600w, https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/field_GRT2_mark-300x273.png 300w\" sizes=\"auto, (max-width: 722px) 100vw, 722px\" \/><p class=\"mt-4 is-col-text g-txt\">\n    Observations of the variable star V1298 Tau (T-Tauri type) are being carried out in 2021, in order to characterize its multi-band variability during the observation by XMM-Newton Space Telescope. The observation is conducted jointly with the Multifunctional Observatory of Chianti and the Castrofilippo Observatory.<\/p>\n        <\/div>\n    <\/div>\n<\/div>\n\n\n\n<div id=\"gallery-block_60b8a53b7ee7c\" class=\"gallery is-padding-block break-article-column z-1 has-extra-light-blue-background-color\">\n    <div class=\"swiper-container swiper-single-gallery pt-5 pb-5 c-md-pt-12 c-md-pb-12\">\n        <div class=\"swiper-wrapper\">\n                        <div class=\"swiper-slide\">\n                    <a class=\"fancybox w-100 d-table\" href=\"https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_FoV.jpg\" data-fancybox=\"images-block_60b8a53b7ee7c\">\n                        <div class=\"image-container w-100 background-cover-image\" style=\"background-image:url('https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_FoV.jpg')\"><\/div> \n                    <\/a>\n                                                                <p class=\"caption mt-3 image-caption\">\n                            The field of view of the  variable star GALVAR1 (in green), and the stars used as a comparison (in red). Credits: GAL Hassin\/Alessandro Nastasi.                        <\/p>\n                                    <\/div>\n                            <div class=\"swiper-slide\">\n                    <a class=\"fancybox w-100 d-table\" href=\"https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_LightCurve.jpg\" data-fancybox=\"images-block_60b8a53b7ee7c\">\n                        <div class=\"image-container w-100 background-cover-image\" style=\"background-image:url('https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_LightCurve.jpg')\"><\/div> \n                    <\/a>\n                                                                <p class=\"caption mt-3 image-caption\">\n                            Brightness variation of the variable star discovered with GRT2 and named GALVAR1. The star with magnitude V=11.83 is located in the constellation of Andromeda at coordinates (J2000) RA=23:39:36.81 and DEC=+42:34:51.7, about 4500 light years from Earth. Credits: GAL Hassin\/Carmelo Falco                        <\/p>\n                                    <\/div>\n                    <\/div>\n        <div class=\"has-primary-gold-background-color px-3 py-3 swiper-button-next next-image-single-gallery\">\n            <svg role=\"img\" class=\"icon icon-sm primary-icon has-primary-blue-fill icon-sm\">\n                <use xlink:href=\"https:\/\/galhassin.it\/wp-content\/themes\/galhassin\/assets\/icons\/sprite.svg#gal-ico-freccia-dx\"><\/use>\n            <\/svg>\n        <\/div>\n        <div class=\"has-primary-gold-background-color px-3 py-3 swiper-button-prev prev-image-single-gallery\">\n            <svg role=\"img\" class=\"icon icon-sm primary-icon has-primary-blue-fill icon-sm\">\n                <use xlink:href=\"https:\/\/galhassin.it\/wp-content\/themes\/galhassin\/assets\/icons\/sprite.svg#gal-ico-freccia\"><\/use>\n            <\/svg>\n        <\/div>\n    <\/div>    \n<\/div>\n\n\n\n<div id=\"citazione-block_60b89dc57ee7a\" class=\"citazione is-padding-block position-relative break-article-column z-2 pt-5 pb-5 px-3 px-md-0 has-extra-light-blue-background-color\">\n    <div class=\"gal-allegati-container mx-auto no-parallax\" >\n        <svg role=\"img\" class=\"icon icon-quote primary-icon ml-1\">\n            <use xlink:href=\"https:\/\/galhassin.it\/wp-content\/themes\/galhassin\/assets\/icons\/sprite.svg#gal-ico-quote-up\"><\/use>\n        <\/svg>\n            <h5 class=\"txt-cit g-txt has-primary-blue-color semiBold w-100 mt-md-5 c-mt-3\">\n                The study of variable stars allowed for the estimation of the distances separating our Sun from celestial bodies in faraway areas of the observable Universe, thus forever changing our vision of the Cosmos<br \/>\r\n<br \/>\r\n            <\/h5>\n            <div class=\"down-quote mt-md-5 c-mt-3 d-flex flex-column\">\n                                <h6 class=\"has-primary-blue-color g-txt semiBold ml-md-auto mr-md-0 ml-0 mr-auto mb-3\">\n                    Sabrina Masiero                 <\/h6>\n                                <svg role=\"img\" class=\"icon icon-quote primary-icon ml-auto\">\n                    <use xlink:href=\"https:\/\/galhassin.it\/wp-content\/themes\/galhassin\/assets\/icons\/sprite.svg#gal-ico-quote-down\"><\/use>\n                <\/svg>\n            <\/div>\n    <\/div>\n<\/div>\n\n\n<div id=\"relatedArticle-block_60b9f9d80866e\" class=\"relatedArticle is-inner-padding-block break-article-column z-1 has-white-background-color\">\n    <div class=\"galhassin-general-container mx-auto c-md-pt-12 pb-md-5 pt-5 pb-3 px-3 z-1 d-flex flex-wrap justify-content-between\">\n        <h4 class=\"semiBold uppercase block-title ls-4\">\n            ARTICOLI CORRELATI         <\/h4>\n        <ul class=\"posts-container noList d-flex flex-wrap pl-0 mt-md-5\">\n                    <li id=\"post-4899\" class=\"post-card px-lg-3 px-sm-2 px-0 c-mt-3 mt-md-0 mb-md-5 c-mb-3\">\n                <div class=\"card card-img no-after\">\n                    <div class=\"img-responsive-wrapper\">\n                        <div class=\"img-responsive\">\n                            <figure class=\"img-wrapper my-0\">\n                                <img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"448\" src=\"https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_LightCurve.jpg\" class=\"attachment-1024x768 size-1024x768\" alt=\"\" srcset=\"https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_LightCurve.jpg 1600w, https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_LightCurve-600x263.jpg 600w, https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_LightCurve-300x131.jpg 300w, https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_LightCurve-1024x448.jpg 1024w, https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_LightCurve-768x336.jpg 768w, https:\/\/galhassin.it\/wp-content\/uploads\/2020\/10\/GALVAR1_LightCurve-1536x672.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/>                            <\/figure>\n                        <\/div>\n                    <\/div>\n                <\/div>\n                <div class=\"cat-date-container d-flex justify-content-between mt-3\">\n                    <div class=\"category-container d-flex flex-wrap categories\"><a class=\"term txt-p g-txt tag uppercase noLink has-dark-blue-color mr-2\" href=\"https:\/\/galhassin.it\/category\/approfondimenti\/\">Approfondimenti<\/a><a class=\"term txt-p g-txt tag uppercase noLink has-dark-blue-color mr-2\" href=\"https:\/\/galhassin.it\/category\/astrofisica\/\">Astrofisica<\/a><\/div>                    <div class=\"post-date\">\n                        <p class=\"caption g-txt\">\n                            19 October 2020                        <\/p>\n                    <\/div>\n                <\/div>\n                <a class=\"mt-3 has-dark-blue-color noLink hoverLink d-table\" href=\"https:\/\/galhassin.it\/brilla-una-nuova-stella-nel-cielo-del-gal-hassin\/\">\n                    <h5 class=\"semiBold g-txt\">\n                        Brilla una nuova stella nel cielo del GAL Hassin                    <\/h5>\n                <\/a>\n                                <p class=\"caption mt-3 d-flex\">\n                    <span class=\"mr-1\">by:<\/span>\n                    <strong>\n                    Sabrina Masiero                     <\/strong>\n                <\/p>\n                            <\/li>\n                <\/ul>\n            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