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						<h1 itemprop="headline">SAC Seminar - George Angelou: How do lithium rich giants form?</h1>
						
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									<h2 class="screenreader-only">Oplysninger om arrangementet</h2>

									
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														Tirsdag 17. september 2019,
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														&nbsp;kl. 14:15 -  15:00
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													<p class="news-event__info__item__ical-link"><a href="/aktuelt/nyhed/artikel/sac-seminar-george-angelou-how-do-lithium-rich-giants-form?tx_news_pi1%5Bformat%5D=ical&amp;type=9819&amp;cHash=c4b0a2df6740e9b7d2bcaab59a5befd1">Tilføj til kalender</a></p>
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														<p>1520-516</p>
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														<span itemprop="name">Brigitte Christina Harke Henderson</span>
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									<p>George Angelou will be visiting us from Garching on September 16-21.<br> He will give the following SAC Seminar in room&nbsp;1520-516:&nbsp;</p>
<p><strong>Date</strong>: 17 September, 2:15pm&nbsp;</p>
<p><strong>Title</strong>: How do lithium rich giants form?</p>
<p><strong>Abstract</strong>: Theoretical models of stellar evolution predict that most of the lithium inside a star is destroyed as the star becomes a red giant. However, observations reveal that about 1% of red giants are peculiarly rich in lithium, often exceeding the amount in the interstellar medium or predicted from the Big Bang. Here we report the discovery of 2,330 low-mass (1 − 3M) lithium-rich giant stars, which we show are consistent with internal lithium production. We rule out most formation channels leaving tidal spin-up from a binary companion as the likely mechanism. Our sample reveals that most lithium-rich giants have helium-burning cores and that the frequency of lithium-rich giants rises with increasing stellar metallicity.</p>
<p>We look forward to seeing you there.</p>
<p>Best regards,</p>
<p>The SAC Seminar Team&nbsp;</p>
								
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