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Extinction in the solar neighborhood: A comparative study of two methods used to measure reddening towards individual stars
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
2016 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Interstellar extinction and reddening are inescapable sources of uncertainty in the study of astronomical objects. Many creative ways to measure its effects have been developed, two of them being evaluated in this study. I apply two recently improved methods to estimate extinction toward individual stars, one based on interstellar absorption of sodium and the other based on opacity maps of the interstellar medium. The methods are applied to 14 stars in the local neighborhood, all within a distance of 250 pc from the Sun, and their results are compared. I find that both methods have severe limitations and large uncertainties, but can still be useful under the right conditions. I also provide suggestions on how the methods can be improved.

Abstract [sv]

Interstellär extinktion och rödfärgning är oundvikliga osäkerhetskällor i studiet av astronomiska objekt. Många kreativa sätt att mäta dess effekter har utvecklats, av vilka två utvärderas i denna studie. Jag tillämpar två nyligen förbättrade metoder för att uppskatta utsläckning mot enskilda stjärnor, en baserad på interstellär absorption av natrium och den andra baserad på opacitetskartor över det interstellära mediet. Metoderna tillämpas på 14 stjärnor i solens närområde, alla inom ett avstånd av 250 pc, och deras resultat jämförs. Jag finner att båda metoderna har allvarliga begränsningar och stora osäkerheter, men ändå kan vara användbara under rätt förutsättningar. Jag ger också förslag på hur metoderna kan förbättras.

Place, publisher, year, edition, pages
2016. , 24 p.
Series
FYSAST, FYSKAND1051
Keyword [en]
interstellar, extinction, reddening, local neighborhood, sodium lines, opacity maps
Keyword [sv]
interstellär, extinkion, rödfärgning, natrium linjer, opacitetskartor
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-296426OAI: oai:DiVA.org:uu-296426DiVA: diva2:938199
Educational program
Upper Secondary School Teacher Education Programme
Supervisors
Examiners
Available from: 2016-06-20 Created: 2016-06-16 Last updated: 2016-06-20Bibliographically approved

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Astronomy, Astrophysics and Cosmology

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