Bolometric correction
In
Description
Mathematically, such a calculation can be expressed:
The bolometric correction for a range of stars with different spectral types and groups is shown in the following table:[1][2][3]
Spectral type | Main Sequence | Giants | Supergiants |
---|---|---|---|
O3 | −4.3 | −4.2 | −4.0 |
G0 | −0.10 | −0.13 | −0.1 |
G5 | −0.14 | −0.34 | −0.20 |
K0 | −0.24 | −0.42 | −0.38 |
K5 | −0.66 | −1.19 | −1.00 |
M0 | −1.21 | −1.28 | −1.3 |
The bolometric correction is large and negative both for early type (hot) stars and for late type (cool) stars. The former because a substantial part of the produced radiation is in the ultraviolet, the latter because a large part is in the infrared. For a star like the Sun, the correction is only marginal because the Sun radiates most of its energy in the visual wavelength range. Bolometric correction is the correction made to the absolute magnitude of an object in order to convert an object's visible magnitude to its bolometric magnitude.
Alternatively, the bolometric correction can be made to absolute magnitudes based on other wavelength bands beyond the visible electromagnetic spectrum.[4] For example, and somewhat more commonly for those cooler stars where most of the energy is emitted in the infrared wavelength range, sometimes a different value set of bolometric corrections is applied to the absolute infrared magnitude, instead of the absolute visual magnitude.
Mathematically, such a calculation could be expressed:[5]
Setting the correction scale
The bolometric correction scale is set by the absolute magnitude of the Sun and an adopted (arbitrary) absolute
The XXIXth International Astronomical Union (IAU) General Assembly in Honolulu adopted in August 2015 Resolution B2 on recommended zero points for the absolute and apparent bolometric magnitude scales.[9][10]
Although bolometric magnitudes have been in use for over eight decades, there have been systematic differences in the absolute magnitude-luminosity scales presented in various astronomical references with no international standardization. This has led to systematic differences in bolometric correction scales. When combined with incorrect assumed absolute
A similar
See also
External links
- https://github.com/casaluca/bolometric-corrections - most up to date tables of bolometric corrections across the HR diagram and interpolation routines in different photometric filters[7][8]
- https://web.archive.org/web/20080312151621/http://www.peripatus.gen.nz/Astronomy/SteMag.html - contains table of bolometric corrections
- http://articles.adsabs.harvard.edu//full/1996ApJ...469..355F/0000360.000.html - contains detailed tables[11] of bolometric corrections (note that these second set of tables are consistent with a bolometric magnitude of 4.73[12] for the Sun and also be aware that there are misprint[12] errors for a few of the figures in the tables)
References
- ISSN 0066-4146.
- ISSN 0004-637X.
- )
- Bibcode:1998A&A...333..231B.
- S2CID 17930469.
Lower effective temperatures correspond to higher values of ; since , cooler RC stars tend to be brighter.
- S2CID 119181086.
- ^ doi:10.1093/mnras/stu1476 with up-to-date interpolation codes https://github.com/casaluca/bolometric-corrections
- ^ ISSN 0035-8711.
- ^ IAU XXIX General Assembly Draft Resolutions Announced, retrieved 2015-07-08
- arXiv:1510.06262v2 [astro-ph.SR].
- doi:10.1086/177785
- ^ S2CID 119219274.