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subgiant

A star that has exhausted the hydrogen at its centre and is evolving into a giant. They are of luminosity class IV. The subgiants we see are usually less massive than the Sun, because more ...

subgiant

subgiant   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

... A star that has exhausted the hydrogen at its centre and is evolving into a giant. They are of luminosity class IV. The subgiants we see are usually less massive than the Sun, because more massive stars move very quickly through this stage into giants. Low-mass stars take many billions of years to evolve this far, so low-mass subgiants are very old. A subgiant branch on the Hertzsprung–Russell diagram, linking the main sequence to the giant branch, is therefore found only for old clusters such as globular...

subgiant

subgiant   Reference library

The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

Reference type:
Subject Reference
Current Version:
2009

... (not hyphenated) Astron. See giant...

subgiant

subgiant  

A star that has exhausted the hydrogen at its centre and is evolving into a giant. They are of luminosity class IV. The subgiants we see are usually less massive than the Sun, because more massive ...
Peacock

Peacock  

The star Alpha Pavonis. It is a B2 subgiant, magnitude 1.9, distance 179 l.y.
Nunki

Nunki  

The star Sigma Sagittarii, magnitude 2.1. It is a B3 subgiant, 228 l.y. away.
Menkalinan

Menkalinan  

The star Beta Aurigae. It is an eclipsing binary consisting of a pair of A2 subgiants that varies between magnitudes 1.9 and 2.0 with a period of 3.96 days. It lies 81 l.y. away.
Merak

Merak  

The star Beta Ursae Majoris, magnitude 2.3. It is an A0 subgiant or dwarf and lies 80 l.y. away. With Dubhe, it forms the Pointers that indicate the direction of the Pole Star, Polaris.
Zubenelgenubi

Zubenelgenubi  

The star Alpha Librae, magnitude 2.7. It is an A3 giant or subgiant 75 l.y. away. It has a wide companion of magnitude 5.2, an F3 dwarf.
Shaula

Shaula  

The star Lambda Scorpii, magnitude 1.6, a B1.5 subgiant 571 l.y. away. It is a variable Beta Cephei star, varying by about 0.05 mag. with a period of 5.1 hours.
Alhena

Alhena  

The star Gamma Geminorum, magnitude 1.9. It is a subgiant of type A1 lying 109 l.y. away.
Alioth

Alioth  

The star Epsilon Ursae Majoris. It is an A0 subgiant of magnitude 1.8 with strong lines of chromium in its spectrum. It is a variable of the Alpha2 Canum Venaticorum type, fluctuating by a few tenths ...
Algenib

Algenib  

The star Gamma Pegasi, a B2 subgiant of magnitude 2.8, lying 392 l.y. away. Algenib is also an alternative name for the star Mirfak (Alpha Persei).
Alpha Crucis

Alpha Crucis  

The brightest star in the constellation Crux, also called Acrux. It is a double star consisting of a B0.5 subgiant, magnitude 1.3, and a B1 dwarf, magnitude 1.7. To the naked eye they appear as a ...
Alshain

Alshain  

The star Beta Aquilae. It is a G8 subgiant of magnitude 3.7, lying 45 l.y. away.
Acamar

Acamar  

The star Theta Eridani, magnitude 2.9. It is a double star, consisting of an A5 subgiant and an A1 dwarf, magnitudes 3.2 and 4.3, 161 l.y. away.
Gamma Cassiopeiae star

Gamma Cassiopeiae star  

A type of rapidly rotating, irregular variable of spectral type Be with an outflow of material from its equatorial region; abbr. GCAS. The formation of equatorial rings or disks is often accompanied ...
luminosity class

luminosity class  

A classification of stars according to their luminosity, which can vary widely for a given spectral type. Luminosity class indicates, for example, whether a star is a supergiant, a giant, or a dwarf. ...
Procyon

Procyon  

The star Alpha Canis Minoris, magnitude 0.40, the eighth-brightest star in the sky. It is an F5 subgiant or dwarf and lies 11.5  l.y. away, among the nearest stars to us. Procyon has a white dwarf ...
R Canis Majoris star

R Canis Majoris star  

A binary star with components of widely differing masses, and somewhat ambiguous spectral features. The type star is a semidetached Algol star, with a late-A-type primary (1.5 solar masses) and a ...
giant branch

giant branch  

The region of the Hertzsprung–Russell diagram that extends diagonally to the upper right of the main sequence, containing giant stars. The giant branch ranges from stars with a surface temperature ...

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