Sentences with phrase «of luminosity class»

Not exact matches

They suggest that «bona - fide» ULXs with luminosities of about million times that of the Sun must belong to a homogeneous class of objects, and SS 433 is an extreme case of the same population.

Star A is a main sequence dwarf star of spectral and luminosity type F7 - 8 V (Wittenmyer et al, 2006, page 178; Bonavita and Desidera, 2007, HD 16895 in Table 8; and NASA Stars and Exoplanet Database) but has been classed as yellow as F9 (Baize and Petit, 1989, page 505.

Zeta Doradus is a main sequence dwarf star of spectral and luminosity type F7 V but has been classed as white as F6 and as yellow as F9 (Lagrange et al, 2009, page 14 for HD 33262; Trilling et al, 2008, page 26; NASA Stars and Exoplanet Database; and SIMBAD).

The luminosity class ranged from I to V, in order of decreasing luminosity.

These classes are encoded into a digital format of the form TT.tt.LL.PPPP, where TT and tt refer to spectral type and subtype, LL to luminosity class, and PPPP to possible spectral peculiarities.

This star is probably a yellow - orange main sequence dwarf star of spectral and luminosity type G2 V (Tinney et al, 2011), but it has been classed as orange as a G5.

Proxima is a red dwarf of spectral class M6 Ve with an absolute magnitude of +15.60, which is only a small fraction of the Sun's luminosity.

Achernar is a blue - white main sequence star of spectral and luminosity type B3 Vpe (Hiltner et al, 1969), that previously had been classed as bright as a subgiant.

However, the high luminosity of the primary star, intense Ca II H and K emission (Smith and Dominy, 1979), and radial velocity variations somewhat larger than can be accounted for by the expected uncertainties suggested that Delta Eridani might be an RS CVn - type binary and therefore a photometric variable like most members of that class.

It closely resembles the Sun (unlike most stars) being a bright G - class star, with a mass of 0.78 solar masses, radius of 0.793 solar radii, and a luminosity of about half that of the Sun.

This spectral and luminosity type of this cool and dim, main sequence red dwarf may be around M1.5 Ve (RECONS), but it has been classed as orange as M0.5 (Demory et al, 2009, Table 4; and Hawley et al, 1996).

Nominal luminosity class VII (and sometimes higher numerals) is now rarely used for white dwarf or «hot sub-dwarf» classes, since the temperature - letters of the main sequence and giant stars no longer apply to white dwarfs.

Wilson set out to see whether stars of similar spectral type and luminosity class (i.e. similar surface temperature and mass) show comparable variations.

HD 111232 is a yellow - orange main sequence dwarf star of spectral and luminosity type G5 V, but it has been classed as orange as a G8.