My Top 3 Dynamically Interesting Stars скачать в хорошем качестве

My Top 3 Dynamically Interesting Stars

Help support this channel on Patreon:   / astrophil   Join this channel to get access to perks:    / @astrophil2000   Welcome, my name is Phil, and in this video, I discuss what my top 3 dynamically interesting stars. These are not the biggest or smallest but my favourites due to how they interact with other objects or the systems they reside in. 1. Polaris Polaris, also known as the North Star, is both a triple star system and a Cepheid variable. Polaris, officially designated Alpha Ursae Minoris, is part of a multiple star system. The system consists of: Polaris A: The primary star, a supergiant, which is the one visible to the naked eye. Polaris Ab: A close dwarf companion to Polaris A, making it a spectroscopic binary. This means it is so close to Polaris A that it cannot be resolved with a telescope, but its presence is known due to its gravitational effects on Polaris A. Polaris B: A distant companion to Polaris A, easily visible with a small telescope. Polaris A is a classical Cepheid variable, which means it is a type of star that pulsates radially, varying in both diameter and temperature, and thus in brightness. These pulsations follow a regular period. For Polaris A, the variability in brightness is relatively small, but it is still noticeable and has been well-studied. Cepheid variables are important in astronomy because their pulsation periods are directly related to their luminosities. This relationship allows astronomers to use Cepheids as standard candles for measuring cosmic distances. 2. TYC 7037-89-1 The TYC 7037-89-1 system is composed of three eclipsing binary pairs of stars. These pairs are gravitationally bound and orbit each other in a complex dance. The system is structured as follows: Binary Pair A (TYC 7037-89-1 A) Binary Pair B (TYC 7037-89-1 B) Binary Pair C (TYC 7037-89-1 C) Each of these pairs consists of two stars orbiting each other. The entire system can be described as a hierarchical structure where: Pair A orbits Pair B in a relatively tight orbit. Pair C orbits the combined center of mass of Pairs A and B at a greater distance. 3. KOI-54 KOI-54, often referred to as a "heartbeat star" due to its distinctive light curve that resembles an electrocardiogram, is an intriguing binary star system. KOI-54 is composed of two A-type stars, which are relatively young and hot. These stars are in a highly eccentric orbit around each other, meaning their distance varies significantly during their orbit. The stars in KOI-54 have an orbital period of about 41.8 days. Their orbit is extremely elliptical, with an eccentricity of around 0.83. This eccentricity causes significant variations in the distance between the stars during their orbit. The system is termed a "heartbeat star" because of the distinctive pattern observed in its light curve, detected by the Kepler Space Telescope. As the stars move in their elliptical orbit, they experience close encounters that cause periodic brightening and dimming. This pattern resembles a heartbeat on an electrocardiogram, hence the name. The periodic brightening events are caused by tidal interactions between the two stars. When the stars are closest to each other (at periastron), their gravitational interaction causes tidal distortions and heating, leading to an increase in brightness. These tidal forces also induce oscillations in the stars, which contribute to the variations in the light curve.