Hertzsprung-russell diagram a level physics

Ejnar Hertzsprung

Danish chemist and astronomer (–)

Ejnar Hertzsprung (Danish:[ˈɑjnɐˈhɛɐ̯tsˌpʁɔŋ]; 8 October – 21 October ) was a Danish chemist and astronomer.

Career

Hertzsprung was born in Frederiksberg, Denmark, the son of Severin and Henriette.

He studied chemical engineering at Copenhagen Polytechnic Institute, graduating in After spending two years working as a chemist in St. Petersburg, in he studied photochemistry at Leipzig University for a year.[1] His father was an amateur astronomer, which led to Ejnar's interest in the subject.

Physics can progress without the proofs, but we can't go on without the facts These stars are another important distance gauge, because their period is related to their absolute magnitude. Born 8 Jan ; died 27 Jan at age Comparing the absolute and apparent magnitudes enabled astronomers to estimate the star's distance.

He began making astronomical observations in Frederiksberg in , and within a few years had noticed that stars with similar spectral type could have widely different absolute magnitudes. In , he took a position at the Göttingen Observatory under director Karl Schwarzschild.[2]

In Hertzsprung developed the Hertzsprung–Russell diagram, independently developed in by Henry Norris Russell.

In Hertzsprung determined the distances to several Cepheid variable stars by parallax,[3] and was thus able to calibrate the relationship, discovered by Henrietta Leavitt, between Cepheid period and luminosity. In this determination he made a mistake, possibly a slip of the pen, putting the stars 10 times too close.

He used this relationship to estimate the distance to the Small Magellanic Cloud. From to , Hertzsprung worked at Leiden Observatory in the Netherlands, from as director.

Ejnar hertzsprung inventions 2018 youtube The message was: A patient waiter is no loser. Crystal detector. Ek, Gunnar. Humans have the same so-called b2 subunit.

Among his graduate students at Leiden was Gerard Kuiper.

Perhaps his greatest contribution to astronomy was the development of a classification system for stars to divide them by spectral type, stage in their development, and luminosity. He used the earlier classification system developed by Antonia Maury in his work.[4] The so-called "Hertzsprung–Russell Diagram" has been used ever since as a classification system to explain stellar types and stellar evolution.

He also discovered two asteroids, one of which is Ivar, an Amor asteroid.[5]

His wife Henrietta (–) was a daughter of the Dutch astronomer Jacobus Kapteyn.

  • Hertzsprung died in Roskilde in The asteroid &#;Hertzsprung was named in his honour.[6]

    Asteroids discovered

    Honors

    Awards and Honors
    Named after him

    Sources

    • Sky & Telescope, January , Sky Publishing Corporation, Cambridge

    References

    1. ^Van Berkel, Klaas; Van Helden, Albert; Palm, L.

      C. (). The History of Science in the Netherlands: Survey, Themes and Reference. BRILL. p.&#; ISBN&#;.

    2. ^Hellyer, B. (October ). "Ejnar Hertzsprung, –".

      Hertzsprung-russell: By 17 Feb , the bill was given its first reading in the House, and reconciliation of amendments from the Senate was complete by 5 Apr This state is called an inverted population. The asteroid Hertzsprung was named in his honour. Humans have the same so-called b2 subunit.

      Journal of the British Astronomical Association. 83: – BibcodeJBAAH.

    3. ^Hertzsprung, E. (). "Über die räumliche Verteilung der Veränderlichen vom δ Cephei-Typus" [On the spatial distribution of variable [stars] of the δ Cephei type]. Astronomische Nachrichten (in German).

      (): – BibcodeANH.

    4. ^Hoffleit, D. "Reminiscences on Antonia Maury and the c-Characteristic." The MK Process at 50 Years: A Powerful Tool for Astrophysical Insight.

      Ejnar hertzsprung inventions 2018 He was the first westerner to describe some of the most interesting natural habitats in the tropics. He earned the sobriquet "the Henry Ford of Aviation" for his efforts to popularize air travel. Mauchly initially conceived of the computer's architecture, and Eckert possessed the engineering skills to bring the idea to life. His work provided a means to approximate the absolute magnitude of a star by virtue of its color.

      Vol.

    5. ^Schmadel, Lutz D. (). "() Ivar". Dictionary of Minor Planet Names – () Ivar. Springer Berlin Heidelberg.

      His leadership was commemorated in when the institute he founded was named the Courant Institute of Mathematical Sciences at New York University. When we look up at the sky and notice how bright a star is, we are thinking of the apparent magnitude; that is, the brightness as seen from Earth. Robertson Bruce H. Another patent was subsequently issued on 11 Apr for a "Refrigerating Apparatus" for "food or corpses," which provides a convenient container and method of chilling using the evaporation of water.

      p.&#; doi/_ ISBN&#;.

    6. ^Schmadel, Lutz D. (). "() Hertzsprung". Dictionary of Minor Planet Names – () Hertzsprung. Springer Berlin Heidelberg.

    7. H-r diagram labeled
    8. Main sequence definition
    9. Hr diagram spectral class
    10. Hr diagram definition

      11. p.&#; doi/_ ISBN&#;.

    11. ^"Ejnar Hertzsprung". American Academy of Arts & Sciences. 9 February Retrieved 25 April
    12. ^"APS Member History". . Retrieved 25 April

    External links