Novae in a sentence

It is possible that NC type novae are objects differing physically very much from normal novae, for example planetary nebulae in formation, exhibiting Wolf-Rayet star like features.

Novae as distance indicators Nova Eridani 2009 ( apparent magnitude ~8.4) during a full moon Novae have some promise for use as standard candle measurements of distances.

Recurrent novae There are ten known galactic recurrent novae.

The contribution of novae to the interstellar medium is not great; novae supply only 1 50 as much material to the Galaxy as do supernovae, and only 1 200 as much as red giant and supergiant stars.

His particular interest is in novae and supernovae, and has been awarded by the BAA with the Walter Goodacre Medal - the highest honour the association awards - and honoured by the Royal Astronomical Society.

Novae occur after white dwarves suck up too much hydrogen from a partner and undergo a cataclysmic fusion event on their surface, increasing their brightness by several orders of magnitude and leaving behind a cloud of leftover gas.

Adding the prefix "super-" distinguishes supernovae from ordinary novae, which are far less luminous.

Curtis noticed that these novae were, on average, 10 magnitudes fainter than those that occurred within our galaxy.

Helium novae A helium nova (or helium flash) is a proposed category of nova explosion that lacks hydrogen lines in the spectrum.

Here he founded the world's first scientific printing press, and in 1472 he published the first printed astronomical textbook, the Theoricae novae Planetarum of his teacher Georg von Peurbach.

His publications on astronomy include a commentary (1542, 1553) on Georg Purbach 's Theoricae novae planetarum.

In 1739 he wrote the Tentamen novae theoriae musicae, hoping to eventually incorporate musical theory as part of mathematics.

Novae also have roughly the same absolute magnitude 15 days after their peak (−5.5).

Novae are thought to occur on the surface of a white dwarf in a binary system when they are sufficiently near to one another, allowing material (mostly hydrogen ) to be pulled from the companion star's surface onto the white dwarf.

Other names, mainly for variable stars (including novae and supernovae ), are being added all the time.

The explosion is created when the white dwarf accretes hydrogen from the companion star, building up mass until the hydrogen undergoes fusion. citation Some novae are also recurrent, having periodic outbursts of moderate amplitude.

The former are smooth, while the latter exhibit short "superhumps" of heightened activity. citation One of the brightest dwarf novae in the sky, citation it has a baseline magnitude of 14.4 and can brighten to magnitude 8.4 during peak activity.

There are roughly a couple dozen novae discovered (brighter than about apparent magnitude 20) in M31 each year.

The spectra of these novae exhibit abundances of neon, magnesium, and other intermediate-mass elements which appear to be only explicable by the accretion of material onto an oxygen-neon-magnesium white dwarf.

The ten known recurrent novae are listed below.