To find out the size of a star, you first need to know its temperature and luminosity. Luminosity refers to the total energy a star radiates in one second. In simple terms, it is a star's intrinsic brightness. A separate lesson on luminosity and brightness exists for more information on ...
Star brightness, magnitude and luminosity Astronomers talk about how bright objects in space look from here on Earth in terms of apparent magnitude, or brightness. The stellar magnitude scale runs backward: the lower the number, the brighter the object. Stars that are magnitude 1 or 0 are the...
Luminosity can also indicate a star’s distance from Earth. Stars like RR Lyrae and Cepheid variables, which change brightness predictably, serve as benchmarks. To determine the luminosities of the globular clusters, Shapely measured the periods of brightness of the RR Lyrae stars in the cl...
Enif apparent magnitude is 2.38, which is a measure of the star's brightness as seen from Earth. Apparent Magnitude is also known as Visual Magnitude. If you use the 1997 parallax value, Enif' absolute magnitude is -4.19. If you use the 2007 parallax value, Enif' absolute magnitude is -...
* stars that are intrinsically variable, that is, their luminosity actually changes, for example because the star periodically swells and shrinks; * eclipsing and rotating variables, where the apparent changes in brightness are a perspective effect. ...
The extreme brightness of this neutron star can be explained only if it has a complex magnetic field with more than two poles (rather than a simple magnetic field with just a pair of poles), the scientists behind the new work said. The neutron star, NGC 5907 X-1, was first identified ...
The dust grains in the interstellar medium (ISM) surrounding active star-forming regions are heated mostly by UV light from massive, young stars, and then cooled down via thermal emission of infrared radiation, producing the typical intense IR brightness observed (redshifted, at high z, to far...
Sirius is highly visible in the Northern Hemisphere's winter night sky, because the star has a highluminosity, or intrinsic brightness, relative to other stars, and because it's relatively close to Earth (8.6 light-years away).According to NASA, Sirius has a mass that's two times that of...
In 1965, Antony Hewish and Samuel Okoye discovered "an unusual source of high radio brightness temperature in the Crab Nebula".[23] This source turned out to be the Crab Nebula neutron star that resulted from the great supernova of 1054. In 1967, Iosif Shklovsky examined the X-ray and op...
In the right column is the one-dimensional surface brightness profile of the UCD. NGVS-UCD330 shows marginal two components in NGVS imaging, and can be much clearly decomposed into two components in HST imaging. The total, King and Sérsic model profile are shown with red, magenta and ...