BL Herculis variables are a subclass of type II Cepheids with low luminosity and mass, that have a period of less than eight days. They are pulsating...

prototype of the BL Herculis class of variable star, a short-period subset of the pulsating Cepheid variables. The variability of BL Herculis was discovered...

RT Trianguli Australis, or RT TrA, is a BL Herculis variable (type II Cepheid) in the constellation of Triangulum Australe. RT TrA varies between apparent...

Virginis and BL Herculis variables, the type II Cepheids. Classical Cepheid variables are higher mass population I stars. RR Lyrae variables are much more...

evolved RR Lyrae variable and is now positioned above the horizontal branch on the HR diagram. V553 Cen is classified as a BL Herculis variable, being a low–mass...

II stars with low masses, including W Virginis variables, BL Herculis variables and RV Tauri variables. The Classical Cepheids are more luminous than...

include: W Virginis, Kappa Pavonis and BL Herculis. Anomalous Cepheids include: XZ Ceti (overtone pulsation mode) and BL Boötis. Smith, D. H. (1984). "Eddington's...

VY Pyxidis is a BL Herculis variable (type II Cepheid) in the constellation of Pyxis. It ranges between apparent magnitudes 7.13 and 7.40 over a period...

brightest star in the cluster is a red giant, the variable star V11, also known as V1554 Herculis, with an apparent visual magnitude of 11.95. M13 is...

between magnitudes 6.99 and 7.83 over 159 days. VY Pyxidis is a BL Herculis variable (type II Cepheid), ranging between apparent magnitudes 7.13 and 7...

UU Herculis variable—a class of yellow supergiant with semiregular variability. These stars are thought to have affinities with Cepheid variables and...

Phi Herculis (φ Her) is a binary star system in the northern constellation of Hercules. Based upon an annual parallax shift of 15.99 mas as seen from Earth...

Omega Herculis (ω Herculis, abbreviated Ome Her, ω Her) is a binary star system in the northern constellation of Hercules. Based upon an annual parallax...

semi-regular variable stars that range in magnitude from 7.0 to 12.0 over a period of 258 days, and magnitude 4.7 to 5.4 over 450 days, respectively. BL Boötis...

temperature of 5,032 K. Xi Herculis was discovered to be a variable star when the Hipparcos data was analyzed. It is a semiregular variable star, oscillating in...

Virginis variables but are now divided into three subclasses based on the length of their period. Stars with periods between 1 and 4 days are of the BL Herculis...

Rho Herculis (ρ Her, ρ Herculis) is a double star in the constellation of Hercules. The apparent magnitudes of the components are 4.510 and 5.398, respectively...

BL Hydri is another close binary system composed of a low-mass star and a strongly magnetic white dwarf. Known as a polar or AM Herculis variable, these...

Cepheid variable star. This is unusual but not unique. At least five other relatively bright examples are known, two of which are of the BL Herculis sub-type...

QSR J1819+3845 is a quasar notable for being the most variable known extragalactic radio source.[when?] This quasar shows variations of factors of four...

Sigma Herculis, Latinized from σ Her, is a binary star system in the northern constellation of Hercules. It has a combined apparent visual magnitude of...

Upsilon Herculis (υ Her) is a solitary star in the constellation Hercules. It is visible to the naked eye with an apparent visual magnitude of 4.74. Based...

"The Chemical Compositions of the Type II Cepheids-The BL Herculis and W Virginis Variables". The Astrophysical Journal. 666 (1): 378–392. arXiv:0706...

Hertzsprung SONG Telescope: Asteroseismology of the G5 Subgiant Star μ Herculis". The Astrophysical Journal. 836 (1): 142. arXiv:1701.03365. Bibcode:2017ApJ...

99 (b) 102 (Ramus) 104 (A) 106 109 (Tusizuo) 110 111 112 32 Oph Variable X AC AM BL DI DQ V446 V533 V772 V777 V838 V1674 HR 6669 6697 6806 HD 146389...

50–80 MG. The system is a source for X-ray emission. Variable stars Polar (cataclysmic variable) AM Herculis Rosen, S. R.; Mittaz, J. P. D.; Buckley, D. A.;...

Chi Herculis, Latinized from χ Herculis, is a Sun-like star in the northern constellation of Hercules. Based upon an annual parallax shift of 62.1 mas...

Strasbourg. Retrieved 2020-01-08. SKY CATALOGUE 2000.0, Volume 2: Double Stars, Variable Stars and Nonstellar Objects (edited by Alan Hirshfeld and Roger W. Sinnott...

to as rapidly oscillating α2 Canum Venaticorum variables. Both the roAp stars and some α2 CVn variables lie on the δ Scuti instability strip and are magnetic...

99 (b) 102 (Ramus) 104 (A) 106 109 (Tusizuo) 110 111 112 32 Oph Variable X AC AM BL DI DQ V446 V533 V772 V777 V838 V1674 HR 6669 6697 6806 HD 146389...