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UID:MEC-68a83eeb494a308fe5295da69428a507@community.kavlimeetings.org
DTSTART:20210913T053000Z
DTEND:20210913T055500Z
DTSTAMP:20210914T193500Z
CREATED:20210915
LAST-MODIFIED:20210915
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:The Variation of Stellar Initial Mass Function with Age and Metallicity
DESCRIPTION:\n\n\n\n\n\nAbstract:\nMost of the structural and evolutionary properties of galaxies rely on the numbers of stars with different masses. The initial mass function (IMF), referred to as the distribution of the initial stellar mass formed in a stellar population, plays crucial roles from the formation of stars to the evolution of galaxies. While many works found no variation of IMF in the Milky Way, studies of the external galaxies claimed that IMF is variable. These works are mostly based on observed samples with a strong dependence on some models. Therefore, direct and less model-dependent evidence of the variation of IMF is highly requested to pin down this essential issue. In our work, we find that the IMF varies with stellar ages as well as metallicity in the solar neighbourhood. By directly counting stars with various masses, we find that older stellar populations contain fewer low-mass stars than the young ones, i.e. they show bottom-light IMF. Meanwhile, the shape of the metal-rich IMF is correlated with stellar metallicity. These results support the theory that IMF is related to both metallicity and star formation rate, which is a temporal quantity in the Galaxy. The non-universality of the IMF will fundamentally change our knowledge of the evolution of the extra-galaxies as well as the Milky Way.\n\n\n\n\n\n\n\nSpeaker:\n\nJiadong LI @ NAOC\n\n\n\nPlace:\n\nKIAA 1st meeting room + zoom Meeting ID: 822 8287 7472 ,Passcode: astroPKU\n\n\n\nTime:\n\nMonday, September 13, 2021 – 1:30PM to Monday, September 13, 2021 – 1:55PM\n\n\n\nLink:\n\nhttps://us02web.zoom.us/j/82282877472?pwd=VXFOYmtaRUhZMVplYWp1OFQ4OGsvQT09 ( https://us02web.zoom.us/j/82282877472?pwd=VXFOYmtaRUhZMVplYWp1OFQ4OGsvQT09 )\n\n\n\n\nBiography:\n\nBefore the Ph.D study in the National Astronomical Observatories of China (CAS), Jiadong LI got his Bachelor degree from Beijing Normal University in 2018. Working with Chao Liu in NAOC, Jiadong is interested in the research of Spectral stellar parameterization and photometric object detection in sky survey projects such as LAMOST, SDSSV, and CSST.\n\n\n
URL:https://us02web.zoom.us/j/82282877472?pwd=VXFOYmtaRUhZMVplYWp1OFQ4OGsvQT09
ORGANIZER;CN=(KIAA) The Kavli Institute for Astronomy and Astrophysics at Peking University:MAILTO:
CATEGORIES:Astrophysics
LOCATION:Virtual
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