But should not "The suffix “ant-” " read "The prefix ant-"? at www.foxhillphoto.com.
Delta Sco may have long term variations >0.2 mag but even though alpha Sco extreme range is 0.73 - 1.19, the average cycle only goes from 0.9 to 1.1. Smith, M.A., Patten, B.M., and Goldberg, L., 1989, “. There do not appear to be photometric variations on the shorter timescale.
April 17, 2020, By: Daniel Johnson
Eventually — and it could theoretically even happen tomorrow — Antares will run out of fuel.
Indeed, when the AAVSO visual observations are phased to this period, the amplitude is about 0.2 mag.
But photometry with the fainter comp stars should be adequate, as long as corrections for sky, extinction, and transformation are carefully made. The primary star that can be seen with your unaided eye is the red supergiant; its companion — Antares B — is a smaller main-sequence B-type star of 5th magnitude. 1. Instagram – https://instagram.com/universetoday, Team: Fraser Cain – @fcain / [email protected] Actually Scorpius and Taurus are more exactly opposite each other - Antares and Aldebaran are almost exactly 12 hrs appart in Right Ascension.
A note for visual observers: Sebastian Otero (OSE) has a long history of making effective and accurate observations of bright, low-amplitude variables. For small-amplitude variables like Antares, there are two additional problems.
In native Hawaiian stories, the constellation is instead a fishhook. Antares, the angry red eye of the constellation Taurus the bull, is a red supergiant star near the end of its life. He’s a longtime amateur astronomer and fortunate enough to live in a rural region with excellent seeing conditions. All rights reserved. Its all rather confusing but at least it allows us folks on the intellectual fringes to look clever .
Daniel Johnson is a Wisconsin-based freelance writer and professional photographer and the co-author of over a dozen books. https://www.youtube.com/playlist?list=PLbJ42wpShvmkjd428BcHcCEVWOjv7cJ1G, Weekly email newsletter: ITunes: https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2 The name Antares has an unusual origin. By studying large, close stars like Antares better, astronomers can better understand how exactly massive stars die and prepare themselves to recycle into the next generation. The photosphere, the layer of a star that emits visible light (and hence is the best working definition of “surface” that we can get when it comes to giant balls of plasma) is about 700 times wider that the sun. Babylonian writings from 5,000 years ago refer to the constellation as a being with a “burning sting.” In Greek lore, the Scorpion occasionally battles Orion, the Hunter, so the two of them are separated in the sky — Orion is visible in the winter, Scorpius in the summer. Shining boldly in the constellation Scorpius is the red supergiant star Antares — a star some 700 times larger than the Sun and so incredibly enormous that it challenges the English language. Surely Antares will go supernova not nebula? Sorry, your blog cannot share posts by email. So when we discuss the variable, we should really say Antares A, but we shall just call it Antares here. Antares (Lehua Kona) sits just above the point of the hook. Equally important: they found evidence, from the Lorentzian shape of the peaks and the 1/f noise in the power spectrum, that the pulsations were driven by stochastic excitation by convective motions. This week I'll be talking Dr. Seth Shostak from the SETI Institute about his work searching the Universe for evidence of extraterrestrials.
Antares is so extreme that its properties are only approximately known. But there’s no question it’s a star of breathtaking proportions. The outer layers of the star are dominated by huge convection cells, so the pulsation could not be purely radial.
Yeah, Antares is in Scorpius and it should go supernova due to its mass of about 12 solar masses. Like us on Facebook: https://www.facebook.com/universetoday But if it Aldebaran why the super giant?
For Northern observers, the choice would be: alp Aql V= 0.77, which is too North for me, and alp Cyg V= 1.25 (also mean magnitude of a variable), although this latter is too far away for a good estimate to be made. Sky & Telescope is part of AAS Sky Publishing, LLC, a wholly owned subsidiary of the American Astronomical Society. Its nature and cause are unknown (Nicholls et al 2009), so we do not know how it fits into the mystery. And More…, Episode 688: Remnants From the Early Universe. Join us at patreon.com/universetoday.
And Antares' visual amplitude is only a few tenths of a magnitude, and its variability is semi-regular at best. Antares is a binary system. A reasonable estimate of the radius would be 800-900 solar radii. But Antares is in the late stages of its life cycle, running out of usable hydrogen in its core. their spectroscopic behavior may be misleading unless the observations are made at the same time. Check the length of their entries in wikipedia, for instance. Supernova explosions, and the winds of hot stars have churned up the gas and dust. https://www.youtube.com/channel/UCUHI67dh9jEO2rvK–MdCSg, Support us at: https://www.patreon.com/universetoday
The Moon also makes a monthly visit to Antares’ vicinity and can act as a guide at these times. Antares is a red supergiant that rises low over the southern horizon in the Northern Hemisphere. Antares is very difficult to observe visually. Chad Weber – [email protected], Support Universe Today podcasts with Fraser Cain, The Guide to Space is a series of space and astronomy poddcasts by Fraser Cain, publisher of Universe Today, Episode 691: Interview: Seth Shostak from the SETI Institute.
His doctoral student Teznie Pugh has recently published an analysis of these data: Pugh and Gray (2013ab) find a dominant spectroscopic period of 2167 +/- 5 days, which they ascribe to some kind of pulsation, and a period of 100 +/- 6 days which they ascribe to solar-like oscillations driven by large-scale convection. Did I mention that if you plopped Antares into our own solar system, its chromosphere would reach to nearly the orbit of Saturn? Antares will implode, then re-explode with the phenomenal force of a supernova, leaving behind a neutron star or black hole. For spectroscopists, an excess of photons is no problem. An “elephant in the room”, however, is the “long secondary period” (LSP) -- a period which is an order of magnitude longer than the fundamental radial period, and is found in about a third of all pulsating red giants and supergiants. Still, it’s hard to say exactly how large it is.
Antares may appear as a point of light but, close-up, it would appear much more complex and impressive. Percy and Sato (2009) obtained weak evidence for a period of about 1700 days using self-correlation analysis.
Betelgeuse is slightly brighter (V = 0.45), perhaps because it is slightly more luminous.
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