Henrietta Swan Leavitt 590787 223399784 2008-07-03T22:29:11Z Ancheta Wis 37284 +caption for thumbnail image {{Infobox Scientist |name = Henrietta Swan Leavitt |box_width = |image =Leavitt aavso.jpg |image_width =163px |caption = Henrietta Swan Leavitt |birth_date = [[July 4]] [[1868]] |birth_place = |death_date = [[December 12]] [[1921]] |death_place = |residence = |citizenship = |nationality = [[United States]] |ethnicity = |field = [[astronomy]] |work_institutions = |alma_mater = |doctoral_advisor = |doctoral_students = |known_for = |author_abbrev_bot = |author_abbrev_zoo = |influences = |influenced = |prizes = |religion = |footnotes = |signature = }} [[Image:Leavitt henrietta b1.jpg|thumb|Henrietta Swan Leavitt]] '''Henrietta Swan Leavitt''' ([[July 4]] [[1868]] &ndash; [[December 12]] [[1921]]) was an American [[astronomer]], and the [[deaf]]<ref>{{cite web|url=http://www.mada.org.il/website/html/eng/2_1_1-31.htm|title=Henrietta Swan Leavitt, A deaf, female scientist—over 100 years ago!|accessdaymonth=18 May|accessyear=2007|publisher=Bloomfield Science Museum, Jeruselem}}</ref> daughter of a [[Congregational church]] minister.<ref>{{cite news|url=http://www.csmonitor.com/2005/0705/p15s01-bogn.html|title=Before computers, there were these humans...|publisher=Christian Science Monitor|author=Gregory M. Lamb|date=July 5, 2005|accessdate=2007-05-18}}</ref> She was born in [[Lancaster, Massachusetts]] to an old Massachusetts Puritan family who had settled in the Massachusetts Bay Colony in the early part of the seventeenth century. (The family name was originally spelled Levet or [[Levett]] in early Massachusetts records.) She graduated from [[Radcliffe College]] (then called the Society for the Collegiate Instruction for Women) with an A.B. degree in 1892. Leavitt began work in 1893 at [[Harvard College Observatory]] as one of the women "[[computer (astronomer term)|computers]]" brought in by [[Edward Charles Pickering]] to measure and catalog the brightness of stars in the observatory's [[photographic plate]] collection. She noted thousands of [[variable star]]s in images of the [[Magellanic Clouds]]. In 1908 she published her results in the ''Annals of the Astronomical Observatory of Harvard College,'' noting that a few of the variables showed a pattern: brighter ones appeared to have longer periods. After further study, she confirmed in 1912 that the variable stars of greater intrinsic [[luminosity]]—actually [[Cepheid variables]]—did indeed have longer periods, and the relationship was quite close and predictable. This relationship provided an important yardstick for measuring distances in the [[Universe]], if it could be calibrated. One year after Leavitt reported her results, [[Ejnar Hertzsprung]] determined the distance of several Cepheids in the [[Milky Way]], and with this calibration the distance to any Cepheid could be determined. At the time, it was not clear that millions of (what we now call) [[galaxy|galaxies]] were actually outside of the Milky Way. Their distance could not be measured until a tool existed. Cepheids were soon detected in other galaxies such as the [[Andromeda Galaxy]] (notably by [[Edwin Hubble]] in 1923-4). Cepheids were an important part of the evidence that galaxies are far outside of the Milky Way. Our picture of the universe was changed forever, largely because of Leavitt's discovery. Leavitt worked sporadically during her time at Harvard, often sidelined by health problems and family obligations. But by 1921, when [[Harlow Shapley]] took over as director of the observatory, she was head of stellar [[Photometry (astronomy)|photometry]]. She succumbed to cancer by the end of that year and was buried in the family plot at Cambridge Cemetery in Cambridge. "Sitting at the top of a gentle hill," writes George Johnson in his biography of Leavitt, "the spot is marked by a tall hexagonal monument, on top of which (cradled on a draped marble pedestal) sits a globe. Her uncle Erasmus (Darwin Leavitt Jr.) and his family are also buried there, along with other Leavitts. A plaque memorializing Henrietta and her two siblings who died so young, Mira and Roswell, is mounted directly below the continent of Australia. Off to one side, and more often visited, are the graves of Henry and [[William James]]." ==Awards and honors== * The [[asteroid]] [[5383 Leavitt]] and the [[Leavitt (crater)|Leavitt crater]] on the [[Moon]] are named in her honour. * Four years after her death, the Swedish mathematician [[Gösta Mittag-Leffler]] considered nominating her for the Nobel prize in physics, and wrote to Shapley requesting more information on her work on Cepheid variables, offering to send her his monograph on [[Sofia Kovalevskaya]]. Shapley replied, suggesting that the true credit belonged to his ''interpretation'' of her findings. She was never nominated, and the Nobel Prize is not awarded posthumously.<ref>Johnson, pp.118-9</ref> == Notes == {{reflist}} ==References== *{{cite book | author=Johnson, George | title=Miss Leavitt's Stars: The Untold Story of the Woman Who Discovered How to Measure the Universe | publisher=New York: W.W. Norton & Company | year=2005 | id=ISBN 0-393-05128-5}} * Lorenzen, Michael (1997). "Henrietta Swan Leavitt." In ''Notable Women in the Physical Sciences: A Biographical Dictionary''. Edited by Barbara and Benjamin Shearer. Westport, CT: Greenwood Press, 233-37. ISBN 0-313-29303-1. [[Category:1868 births|Leavitt, Henrietta Swan]] [[Category:1921 deaths|Leavitt, Henrietta Swan]] [[Category:American astronomers|Leavitt, Henrietta Swan]] [[Category:Women astronomers|Leavitt, Henrietta Swan]] [[Category:Radcliffe College alumni|Leavitt, Henrietta]] [[ca:Henrietta Swan Leavitt]] [[de:Henrietta Swan Leavitt]] [[es:Henrietta Swan Leavitt]] [[fa:هنریتا سوان لیویت]] [[fr:Henrietta Swan Leavitt]] [[ko:헨리에타 스완 리빗]] [[it:Henrietta Swan Leavitt]] [[he:הנרייטה ליוויט]] [[nl:Henrietta Leavitt]] [[ja:ヘンリエッタ・スワン・リービット]] [[nds:Henrietta Swan Leavitt]] [[pl:Henrietta Leavitt]] [[pt:Henrietta Swan Leavitt]] [[sk:Henrietta Swan Leavittová]] [[sv:Henrietta Swan Leavitt]] [[tr:Henrietta Swan Leavitt]] [[zh:亨丽爱塔·勒维特]]