KQ Velorum is a variable star system in the southern constellation of Vela. It has the identifier HD 94660 in the Henry Draper Catalogue; KQ Vel is the variable star designation. This appears as a sixth magnitude star with an apparent visual magnitude of 6.112, and thus is dimly visible to the naked eye under suitable viewing conditions. The system is located at a distance of approximately 373 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of around 23 km/s. This was first identified as a chemically peculiar star by Carlos and Mercedes Jaschek in 1959, who found spectral peculiarities in the silicon absorption bands. The long-term photometric variability of this star was reported by in 1993, who noted a possibly complicated light curve with an estimated period on the order of 2,700 days. In 1975, and detected a strong magnetic field in excess of 1 kG on the star. Radial velocity measurements by and associates (1997) demonstrated this is a spectroscopic binary system. This single-lined spectroscopic binary has a physical separation of at least 1.25 ± 0.01 AU, an orbital period of 2.32 years, and a high eccentricity (ovalness) of 0.45. The visible component is an Ap star with a stellar classification of Ap(SiCr), although the effective temperature of 11,300 K is a closer match to a spectral type of B8.5p. and associates (1991) gave a spectral type of A0p EuCrSi, indicating the spectrum shows peculiarities in the europium, chromium, and silicon bands. It is classified as an Alpha2 Canum Venaticorum variable with a brightness that varies from 6.10 down to 6.12 in magnitude. KQ Vel is a frequently-studied object that is often used as a magnetic standard star. The magnetic field of this star has a dipole strength of 7.5 kG, while displaying additional quadropole and octopole moments. It is inclined to the rotation axis by 16°. The mean longitudal field is almost constant, showing a strength of −2 kG. The star is less than halfway through its main sequence lifespan, but is rotating very slowly with a period of around 2,800 days. It has three times the mass and 2.5 times the radius of the Sun, while radiating 105 times the Sun's luminosity. The mass function of the system indicates that the secondary must have more than two times the mass of the Sun, yet there is no sign of it in otherwise high-quality spectra. A main sequence stellar companion of this mass would have a spectral type earlier than A5V. This led to the suggestion that this companion must be a compact object, either a black hole, a neutron star, or a pair of white dwarfs. In 2018 the companion was detected in the near infrared using the Pioneer instrument at the VLIT observatory, showing an H-band magnitude difference of 1.8±0.03 at an angular separation of 18.72±0.02 mas. This corresponds to a projected linear separation of a little over 2 AU. X-ray observations with the Chandra X-ray Observatory in 2016 confirmed that the companion is a neutron star; the first known pair of strongly magnetic Ap star and neutron star that have been discovered. The neutron star in this system is the product of a supernova explosion, possibly of the electron capture type that would not significantly disrupt the orbit. The strongly magnetic Ap star is likely the result of a merger, perhaps from an W UMa close binary. The current neutron star may have been the tertiary member of the system, and it gained mass during a Roche lobe overflow of the binary components. (Wikipedia).
Vernier caliper / diameter and length of daily used objects.
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From playlist Fine Measurements
How to use a Vernier Calliper to measure length
A vernier calliper is a tool that allows you to measure length to a precision of 0.02mm. This video shows you how to use it Subscribe - www.youtube.com/c/physicshigh LIKE and SHARE with your peers. And please add a COMMENT to let me know I have helped you. Support my work either regularl
From playlist skills and foundations
What is the difference between convex and concave
👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
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👉 Learn how to define angle relationships. Knowledge of the relationships between angles can help in determining the value of a given angle. The various angle relationships include: vertical angles, adjacent angles, complementary angles, supplementary angles, linear pairs, etc. Vertical a
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Wolf Rayet Stars in Space Engine
Patreon page: https://www.patreon.com/user?u=2318196&ty=h Hello and welcome to What Da Math! In this video, we will look for Wolf Rayet stars in Space Engine. Enjoy and please subscribe. Don't forget, support this game as it's completely free and you can get it here: http://en.spaceen
From playlist Space Engine
👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
👉 Learn how to define angle relationships. Knowledge of the relationships between angles can help in determining the value of a given angle. The various angle relationships include: vertical angles, adjacent angles, complementary angles, supplementary angles, linear pairs, etc. Vertical a
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What is the difference between convex and concave polygons
👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
Tricks for Solving Coulomb's Law Problems
4 great tips for solving Coulomb's equation for Physics students. Help for AP Physics and College students. (Companion video to Charles Coulomb biography) My Patreon Page (thanks!): https://www.patreon.com/user?u=15291200 The music is from the awesome Kim Nalley of course www.KimNalley.
From playlist Misc Fun Videos
What is an angle and it's parts
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CCSS What is an angle bisector
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19.3 The Electric Potential Difference Created by Point Charges
This video covers Section 19.3 of Cutnell & Johnson Physics 10e, by David Young and Shane Stadler, published by John Wiley and Sons. The lecture is part of the course General Physics - Life Sciences I and II, taught by Dr. Boyd F. Edwards at Utah State University. This video was produced
From playlist Lecture 19A. Electric Potential Energy and the Electric Potential
Physics 38 Electrical Potential (12 of 22) Potential In-, On, & Outside a Spherical Conductor
Visit http://ilectureonline.com for more math and science lectures! In this video I will find the potential inside, at the surface, and outside of a spherical conductor.
From playlist PHYSICS 38 ELECTRICAL POTENTIAL
Physics 36 Electric Field (15 of 18) The Electric Dipole
Visit http://ilectureonline.com for more math and science lectures! In this video I will find the electric field of an electric dipole.
From playlist PHYSICS 36 THE ELECTRIC FIELD
Physics - E&M: Maxwell's Equations (11 of 30) Differential Form of Gauss' Law: 3
Visit http://ilectureonline.com for more math and science lectures! In this video I will give an example (1) of the divergence of a vector of a point charge a R distance away.
From playlist PHYSICS 46 MAXWELL'S EQUATIONS
Physics - E&M: Maxwell's Equations (14 of 30) Differential Form of Gauss' Law: 6
Visit http://ilectureonline.com for more math and science lectures! In this video I will give an example (4) of the divergence of a vector of a Gaussian sphere.
From playlist PHYSICS 46 MAXWELL'S EQUATIONS
Physics 38 Electrical Potential (20 of 22) Equipotential Surfaces in a Varied E-Field
Visit http://ilectureonline.com for more math and science lectures! In this video I will examines what equipotential surfaces looks like in a varied electric field.
From playlist PHYSICS 38 ELECTRICAL POTENTIAL
MountainWest RubyConf 2010 - EventMachine by Aman Gupta
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From playlist Mountain West Ruby 2010
Point Charges (5 of 10) Work Done to Bring a Point Charge in From Infinity
Shows how to calculate the amount of work done to bring a charge a from infinity to close to another point charge. An electric potential is the amount of work needed to move a unit of positive charge from a reference point to a specific point inside the field without producing an accelerat
From playlist Electricity and Magnetism
CCSS What is the difference between Acute, Obtuse, Right and Straight Angles
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