Antares is a supergiant star with a stellar classification of M1. 5Iab-b.

The stellar classification of this star is B2. 5, with numerous spectral lines suggesting it has been polluted by matter ejected by Antares.

A refined scheme for stellar classification was published in 1943 by W. W. Morgan and P. C. Keenan.

However, the modern version of the stellar classification scheme was developed by Annie J. Cannon during the 1900s.

Stars of roughly 0. 5 – 10 solar masses become red giants: large non-main sequence stars of stellar classification K or M. Red giants lie along the right edge of the Hertzsprung-Russell diagram due to their red color and large luminosity.

In astronomy, stellar classification is a classification of stars based on their spectral characteristics.

Beta Trianguli Australis is a double star, the primary being a F-type main-sequence star with a stellar classification of F1 V, and an apparent magnitude of 2. 85.

In the current system of stellar classification, stars are grouped according to temperature, with the very young and energetic Class O stars boasting temperatures in excess of 30, 000K while the older Class M stars exhibit temperatures less than 3, 700K — a vast difference that has a huge impact on the star's luminosity.

The spectrum of this star matches a stellar classification of, with the luminosity class of III indicating that it is an evolved giant star that has exhausted the supply of hydrogen at its core and is now on the red giant branch.

# REDIRECT stellar classification

The so-called " Hertzsprung – Russell Diagram " has been used ever since as a classification system to explain stellar types and evolution.

Astronomical photography is one of the earliest types of scientific photography and almost from its inception it diversified into subdisciplines that each have a specific goal including star cartography, astrometry, stellar classification, photometry, spectroscopy, polarimetry, and the discovery of astronomical objects such as asteroids, meteors, comets, variable stars, novae, and even unknown planets.

* Class M star, a stellar classification

The proximity of this star makes it one of the most studied stars of its stellar classification.

The estimated surface temperature is 5, 084 K. With a stellar classification of K2 V, it is the second-nearest K-type main-sequence star after Alpha Centauri B.

* MK spectral classification, a stellar classification system based on spectral lines

It has a stellar classification of B0. 5 Iab:.

Wolf 359 has a stellar classification of M6. 5, although various sources list a spectral class of M5. 5, M6 or M8.

The spectrum of Lacaille 9352 places it at a stellar classification of M0. 5V, indicating it is a type of main sequence star known as a red dwarf.

A stellar classification of M3. 5V makes this a red dwarf star that is generating energy through the nuclear fusion of hydrogen at its core.

It has a stellar classification of M6 V, which indicates it is a type of main sequence star known as a red dwarf.

This low mass star has a stellar classification of M4 V, which places it among a category of stars known as red dwarfs.

The stellar classification is sdM1, which indicates that it is a subdwarf star with a luminosity lower than that of a main sequence star at the same spectral type of M1.

The secondary companion in this system may be a main sequence star with a stellar class of B2.

A stellar classification of B2 IV suggests it is a subgiant star that has begun to evolve from the main sequence with the exhaustion of the hydrogen at its core.

Nunki has a spectrum matching a stellar classification of B2. 5 V, which indicates this is a B-type main sequence star.

This star has a stellar classification of B2 IV, making it a subgiant star that is in the process of evolving away from the main sequence stage.

The spectrum of the primary component has a stellar classification of B2 IIIpe.

The combined stellar classification of the pair is B2 IV, which matches the class of a B-type subgiant star that has exhausted the hydrogen at its core and begun to evolve into a giant.

The binary is composed of a stellar class O9 III star ( blue giant ) and a class B0. 8 III / IV star, with the secondary being about 2 magnitudes fainter.

The spectrum of this star matches a stellar classification of G2 IV, with the luminosity class of ' IV ' indicating this is a subgiant star.

Alpha Gruis has a stellar classification of B6 V, although some sources give it a classification of B7 IV.

The spectrum matches a stellar classification of A1 IV.

The stellar classification of Alpha Columbae is B7 IV, with the luminosity class of IV indicating it has evolved into a subgiant star.

The primary component is a subgiant star with a stellar classification of K2 IV.

The emergence of Boazan as a stellar invader came during the reign of Hakkor IV.

Delta Geminorum is a subgiant star with the stellar classification F0 IV.

Kaus Borealis is a subgiant star with a stellar classification of K0 IV.

The stellar classification of this star has been rated at B8. 5 III and B7 IV, with a luminosity class of III indicating it is a giant star, while a class of IV suggests it is still a subgiant star.

The secondary companion has a stellar classification of A4 IV, suggesting that it is a subgiant star that has nearly exhausted the supply of hydrogen at its core and is in the process of evolving into a giant star.

The spectrum of the star matches a stellar classification of B3 IV, where the luminosity class of ' IV ' indicates this is a subgiant star that has nearly exhausted the supply of hydrogen at its core and is evolving away from the main sequence.

Estimates of the combined stellar classification for this system range from F5III to F6IV, with the luminosity class of ' IV ' or ' III ' indicating the primary component is a subgiant or giant star, respectively.

The primary component of this putative system has a published stellar classification of F6 IV, indicating it is a subgiant star that is evolving away from the main sequence.

The stellar classification of Lambda Ursae Majoris is A2 IV, with the luminosity class of ' IV ' indicating that, after 410 million years on the main sequence, this star is in the process of evolving into a giant star as the supply of hydrogen at its core becomes exhausted.