Search results
Results from the WOW.Com Content Network
The bolometric correction scale is set by the absolute magnitude of the Sun and an adopted (arbitrary) absolute bolometric magnitude for the Sun.Hence, while the absolute magnitude of the Sun in different filters is a physical and not arbitrary quantity, the absolute bolometric magnitude of the Sun is arbitrary, and so the zero-point of the bolometric correction scale that follows from it.
M bol,⊙ is the bolometric magnitude of the Sun; M bol,★ is the bolometric magnitude of the star. In August 2015, the International Astronomical Union passed Resolution B2 [9] defining the zero points of the absolute and apparent bolometric magnitude scales in SI units for power and irradiance (W/m 2), respectively. Although bolometric ...
While the zero point is defined to be that of Vega for passband filters, there is no defined zero point for bolometric magnitude, and traditionally, the calibrating star has been the sun. [6] However, the IAU has recently defined the absolute bolometric magnitude and apparent bolometric magnitude zero points to be 3.0128×10 28 W and 2.51802× ...
The apparent magnitude is the observed visible brightness from Earth which depends on the distance of the object. The absolute magnitude is the apparent magnitude at a distance of 10 pc (3.1 × 10 17 m), therefore the bolometric absolute magnitude is a logarithmic measure of the bolometric luminosity.
Bolometric luminosity (L ☉, Sun = 1) Absolute bolometric magnitude Approx. distance from earth Apparent visible magnitude Effective temperature Link Reference ζ 1 Scorpii (in NGC 6231 of Scorpius OB1) 851,000 -10.085 8,210 4.705 17,200 SIMBAD [108] [109] ζ Puppis (Naos in Vela R2 of Vela Molecular Ridge) 813,000 -10.035 1,080 2.25 40,000 ...
A more complex definition of absolute magnitude is used for planets and small Solar System bodies, based on its brightness at one astronomical unit from the observer and the Sun. The Sun has an apparent magnitude of −27 and Sirius, the brightest visible star in the night sky, −1.46. Venus at its brightest is -5.
The zero point of the apparent bolometric magnitude scale is based on the definition that an apparent bolometric magnitude of 0 mag is equivalent to a received irradiance of 2.518×10 −8 watts per square metre (W·m −2).
At present, Vega has more than twice the mass [22] of the Sun and its bolometric luminosity is about 40 times the Sun's. Because it is rotating rapidly, approximately once every 16.5 hours, [ 14 ] and seen nearly pole-on, its apparent luminosity, calculated assuming it was the same brightness all over, is about 57 times the Sun's. [ 12 ]