Book contents
- Frontmatter
- Contents
- Preface
- Part One Content description
- A Aluminum Al to Arsenic As
- B Barium Ba to Boron B
- C Cadmium Cd to Curium Cm
- D Dysprosium Dy
- E Erbium Er to Europium Eu
- F Fluorine F
- G Gadolinium Gd to Gold Au
- H Hafnium Hf to Hydrogen H
- I Indium In to Iron Fe
- K Krypton Kr
- L Lanthanum La to Lutetium Lu
- M Magnesium Mg to Molybdenum Mo
- N Neodymium Nd to Nitrogen N
- O Osmium Os to Oxygen O
- P Palladium Pd to Promethium Pm
- R Rhenium Re to Ruthenium Ru
- S Samarium Sm to Sulfur S
- T Tantalum Ta to Tungsten W
- U Uranium U
- V Vanadium V
- X Xenon Xe
- Y Ytterbium Yb to Yttrium Y
- Z Zinc Zn to Zirconium Zr
- Summary
- Part Two Content description
- Part Three Content description
- Part Four Content description
- References
- Index of elements in stars
- Index of molecules in stars
O - Osmium Os to Oxygen O
Published online by Cambridge University Press: 06 July 2010
- Frontmatter
- Contents
- Preface
- Part One Content description
- A Aluminum Al to Arsenic As
- B Barium Ba to Boron B
- C Cadmium Cd to Curium Cm
- D Dysprosium Dy
- E Erbium Er to Europium Eu
- F Fluorine F
- G Gadolinium Gd to Gold Au
- H Hafnium Hf to Hydrogen H
- I Indium In to Iron Fe
- K Krypton Kr
- L Lanthanum La to Lutetium Lu
- M Magnesium Mg to Molybdenum Mo
- N Neodymium Nd to Nitrogen N
- O Osmium Os to Oxygen O
- P Palladium Pd to Promethium Pm
- R Rhenium Re to Ruthenium Ru
- S Samarium Sm to Sulfur S
- T Tantalum Ta to Tungsten W
- U Uranium U
- V Vanadium V
- X Xenon Xe
- Y Ytterbium Yb to Yttrium Y
- Z Zinc Zn to Zirconium Zr
- Summary
- Part Two Content description
- Part Three Content description
- Part Four Content description
- References
- Index of elements in stars
- Index of molecules in stars
Summary
This element was discovered by S. Tennant in London in 1803. The name comes from the Greek osme (smell).
lonization energies
OsI 8.7 eV, OsII 16.6 eV, OsIII 24.9 eV.
Absorption lines of OsI
The equivalent width of OsI 3232(3) in the sun is 0.018. OsI is present in M 2 III stars (Davis 1947).
Behavior in non-normal stars
Osl and OsII lines were identified by Guthrie (1969) in one Ap star of the Cr- Eu-Sr subgroup W(4608, OsII)=0.038 and W(4421, OsI)=0.040. Brandi and Jaschek (1970) and Cowley (1987) later identified this element in other Ap stars.
Isotopes
Os has seven stable isotopes, Os 184, 186, 187, 188, 189, 190 and 192. These occur in the solar system with frequencies 0.02%, 2%, 2%, 13%, 16%, 26% and 41% respectively. There also exist 12 unstable isotopes and isomers.
Origin
Os 189,190 and 192 are pure r process products. Os188 can be produced by both the r process and the s process. Os186 and Os187 are pure s process products and Os184 is produced only by the p process.
This element was discovered independently by J. Priestley in Leeds, England in 1774 and by C. Scheele in Uppsala, Sweden in 1771. The name comes from the Greek oxy genes (acid forming).
- Type
- Chapter
- Information
- The Behavior of Chemical Elements in Stars , pp. 131 - 139Publisher: Cambridge University PressPrint publication year: 1995