『Episode 108 - He found a Green Star!』のカバーアート

Episode 108 - He found a Green Star!

Episode 108 - He found a Green Star!

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If you'd like to watch the video version of this interview, check it out here. EPISODE 108: GREEN STARS & SUPERNOVA SURVIVORS WITH DR. MARK HOLLANDSWhat color would a white dwarf look if you could see it up close? That simple question led Dr. Mark Hollands to some surprising answers, including a star that would appear pale green.This week, Roo welcomes Mark, a Warwick Prize Fellow and astrophysicist at the University of Warwick, for a conversation about the dense stellar remnants that most stars will eventually become. We explore why these stars can have unusual colors, how their spectra reveal their chemistry, and what those findings mean for the way astrophotographers think about star color.Mark takes us through the Sloan Digital Sky Survey, Gaia's transformation of white-dwarf research, and the care needed when translating astronomical measurements into RGB colors. We also discuss the realities of working at professional observatories - from liquid-nitrogen-cooled cameras to telescope breakdowns and whether backyard imagers can photograph the stars in his study.Then we turn to an extraordinary class of survivors: white dwarfs flung through space when their companions explode. Their chemistry offers clues to supernovae and the origins of elements around us. Mark also introduces his favorite stellar oddball, GD 492, known as LP 40-365.There's room for the person behind the research, too: mushroom foraging, birding, sim racing, following your curiosity, and a Pink Floyd reference hiding in a scientific paper.Also in this episode: an update on The Astrocast's new Move Shoot Move partnership!IN THIS EPISODE- How white dwarfs form and why they fascinate Mark.- Pale-green, yellow, and pink stars...and why green is especially unusual.- Spectroscopy as a chemical barcode for starlight.- Gaia, PixInsight, and the limits of mapping measurements to visible color.- Carbon molecules, dense atmospheres, and salmon-pink starlight.- Professional observing, remote telescopes, and future surveys.- Type Ia supernovae, runaway D6 survivors, and stellar chemistry.- Practical advice for students interested in astrophysics.CHAPTERS00:00 Welcome to The Astrocast01:24 Meet Dr. Mark Hollands: what is a white dwarf?02:17 Mark's path into astronomy05:09 The fate awaiting most stars06:54 What colors are white dwarfs?08:36 A star that would look pale green09:32 How rare are unusual stellar colors?11:50 Spectroscopy and a star's chemical barcode16:07 Mining the Sloan Digital Sky Survey18:35 How Gaia transformed white-dwarf research21:26 Gaia, PixInsight, and star-color calibration23:19 Red stars, carbon, and a salmon-pink white dwarf28:16 Mushroom foraging, birding, and curiosity31:56 Advice for aspiring astrophysicists34:00 Life at a professional observatory39:54 Book recommendation & Move Shoot Move update40:47 Pink Floyd and Any Colour You Like41:43 Can amateurs photograph these stars?43:54 The next generation of spectroscopic surveys45:57 D6 survivors: white dwarfs launched by supernovae51:38 Supernova chemistry and the iron around us54:21 Mark's favorite object: GD 492 / LP 40-36556:39 Mushrooms, sim racing, and hobbies57:59 A dream observation with the Extremely Large Telescope59:37 Roo's closing thoughts1:00:06 The Astrocast outro songGUEST & RESOURCESDr. Mark Hollands:https://mahollands.github.io/Paper discussed: Any Colour You Likehttps://academic.oup.com/rasti/article/doi/10.1093/rasti/rzag069/8914458?searchresult=1Book mentioned: The Last Stargazers by Emily Levesquehttps://link.amazon/B0eV2rQKvJOIN THE ASTROCAST SOCIETYSupport the show on Patreon and join our private astronomy and astrophotography Discord community:https://www.patreon.com/c/TheAstrocastSHOP THROUGH OUR AFFILIATE LINKSYour purchases through these links help support The Astrocast at no additional cost to you.Agena Astro:https://agenaastro.com/?rfsn=8632339.cb455fHigh Point Scientific:https://www.highpointscientific.com/?rfsn=8141859.a5f5d85Amazon:https://amzn.to/4n0OMszFirst Light Optics:https://www.firstlightoptics.com/index/ref/astrocast/365 Astronomy:https://www.365astronomy.com/&af=astrocastMove Shoot Move:https://www.moveshootmove.com/?aff=784Disclosure: The Astrocast earns a small commission from qualifying purchases through these links. As an Amazon Associate, I earn from qualifying purchases.If you enjoyed the episode, follow The Astrocast, leave a rating or review, and share it with someone who loves astronomy. Clear skies!<3 RooSupport the showEmail me at "Roo@TheAstrocast.com" with any questions/comments. Thanks for listening!
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